AU2018200925B1

AU2018200925B1 - Earthquake warning system based on acceleration sensors and earthquake parameter acquisition method

Info

Publication number: AU2018200925B1
Application number: AU2018200925A
Authority: AU
Inventors: Yang Dong
Original assignee: Institute of Geology and Geophysics of CAS
Current assignee: Institute of Geology and Geophysics of CAS
Priority date: 2018-01-12
Filing date: 2018-02-08
Publication date: 2018-04-19
Anticipated expiration: 2038-02-08
Also published as: CN108051848A; CN108051848B

Abstract

The present invention discloses an earthquake warning system based on acceleration sensors and an earthquake parameter acquisition method, and belongs to the technical field of earthquake warning. The system comprises a control device and a plurality of detection devices, and each detection device comprises three detection units and a data processing unit closes to the three detection units. The control device receives earthquake information sent by each data processing unit, adaptively selects a plurality of target detection devices according to a preset rule and finally determines earthquake parameters based on the earthquake information sent by the selected target detection devices. The detection units do not need to transmit mass original earthquake data to the control device in real time, so that the problem of delay caused by long-distance real-time earthquake data packing and network transmission can be relieved, and the accuracy of warning information can be improved in consideration of the limitation of warning time. Moreover, the adjacent detection devices and the adjacent detection units are arranged relatively close to pick up earthquake events fast, so as to increase the warning time.

Description

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-1EARTHQUAKE WARNING SYSTEM BASED ON ACCELERATION SENSORS AND EARTHQUAKE PARAMETER ACQUISITION METHOD

Field of the Invention [0001] The present invention relates to an earthquake warning system based on acceleration sensors and an earthquake parameter acquisition method.

[0002] The invention has been developed primarily for use in the field of earthquake warnings in areas of exploration and operation of geothermal and other below ground new energy sources and will be described herein after with reference to that application. However, it will be appreciated that the invention is not limited to that particular field of use and is also applicable to other fields and industries such as the exploration of other energy sources such as shale gas, and even for more conventional energy sources, and for earth quake warning systems more generally.

Background of the Invention [0003] Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.

[0004] The principle of earthquake warning is based on the characteristics that the propagation velocity of electromagnetic waves is further greater than that of earthquake waves and the propagation velocity of earthquake longitudinal waves (P waves) is faster than that of transverse waves (S waves) and surface waves. Before destructive earthquake waves arrive at a city or a major project at a certain distance from the source zone, earthquake related information is acquired fast, and earthquake warning is timely released to a potential destructed area, so that emergency measures are taken in time to reduce the possible loss of an earthquake. Therefore, the effect of earthquake warning is directly related to whether people can take reasonable emergency measures in time after obtaining the earthquake warning, so as to reduce earthquake damage as far as possible.

[0005] It could be understood that the warning time and the accuracy of warning information are two key factors that affect the effect of earthquake warning. The existing earthquake warning system monitors earthquake waves by using a plurality of strong motion seismographs deployed in a warning target area or a potential source area, and the distance between

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-2earthquake stations is relatively long, and is usually more than or equal to 100 km. When the earthquake occurs, these strong motion seismographs acquire earthquake waves successively, and directly transmit the acquired earthquake waves at long distances to the same warning center. The warning center calculates warning information and then releases it. The principle of earthquake warning determines that the warning time has an upper limit. Considering the limitation of warning time, the warning center usually fuses original earthquake wave data sent by at least three strong motion seismographs that detect the earthquake event, and calculates the warning information, so the accuracy is difficult to guarantee.

Summary of the Invention [0006] In view of the above, the embodiments of the present application provide an earthquake warning system based on acceleration sensors and an earthquake parameter acquisition method, which can effectively solve the technical problem that the accuracy of warning information is difficult to guarantee in the prior art, and are beneficial to improving the accuracy of warning information in consideration of the limitation of warning time.

[0007] Embodiments of the present application provide the following technical solutions:

In the first aspect, an embodiment of the present invention provides an earthquake warning system based on acceleration sensors, including a control device and a plurality of detection devices, wherein the plurality of detection devices are distributed in an earthquake monitoring area. Each detection device includes three detection units distributed according to preset intervals and a data processing unit close to the three detection units, the three detection units are coupled with the corresponding data processing unit, and the data processing unit is coupled with the control device. The detection unit is used for acquiring earthquake wave data via acceleration sensors, and sending the earthquake wave data to the corresponding data processing unit. The data processing unit is used for processing the earthquake wave data sent by the three detection units corresponding to the data processing unit to obtain earthquake information, and sending the earthquake information to the control device, wherein the earthquake information includes P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude. The control device is used for selecting target detection devices from the plurality of detection devices according to a preset rule, and obtaining earthquake parameters based on the earthquake information sent by the target detection devices, wherein the earthquake parameters include second source location and second earthquake magnitude. The preset rule includes: judging whether the source is within a detection area of a feature detection device, wherein the feature detection device is the detection device which fastest picks up a P wave earthquake phase; if the source is within

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-3the detection area of the feature detection device, matching the amplitude data of the feature detection device with a preset first threshold range to obtain a first target area, and selecting all the detection devices within the first target area as the target detection devices; and if the source is beyond the detection area of the feature detection device, matching the amplitude data of the feature detection device with a preset second threshold range to obtain a second target area, and selecting all the detection devices within the second target area as the target detection devices, wherein the first target area is smaller than the second target area.

[0008] Further, the data processing unit is specifically used for: respectively performing P wave earthquake phase pickup on the earthquake wave data sent by the corresponding three detection units to obtain P wave earthquake phase arrival time and P wave amplitude data; acquiring positioning data of the corresponding three detection units; obtaining first source location and first earthquake magnitude according to the obtained P wave earthquake phase arrival time, P wave amplitude data and positioning data; and sending the P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude as the earthquake information to the control device.

[0009] Further, the preset intervals are 1-5 km.

[0010] Further, the interval of two adjacent detection devices is 30-50 km.

[0011] Further, the detection unit includes a recorder. The output end of the acceleration sensor is coupled with the input end of the recorder, and the output end of the recorder is coupled with the corresponding data processing unit. The acceleration sensor is used for acquiring earthquake wave acceleration signals, and sending the acceleration signals to the recorder. The recorder is used for processing the acceleration signals to obtain earthquake wave data, and sending the earthquake wave data to the corresponding data processing unit.

[0012] Further, each detection device further includes a first router, and the control device includes a controller and a second router, the first router is coupled with the data processing unit, the second router is coupled with the controller, and the second router is coupled with each first router. The first router is used for sending the earthquake information processed by the data processing unit to the second router. The second router is used for sending the received earthquake information to the controller. The controller is used for selecting target detection devices from the plurality of detection devices according to the preset rule, and obtaining earthquake parameters based on the earthquake information sent by the target

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-4detection devices, wherein the earthquake parameters include second source location and second earthquake magnitude.

[0013] Further, the earthquake warning system further includes a warning information release device, which is coupled with the control device. The control device is also used for sending the earthquake parameters to the warning information release device. The warning information release device is used for generating and releasing earthquake warning information according to the earthquake parameters.

[0014] Further, the earthquake warning system further includes a warning information receiving device, which is coupled with the warning information release device. The warning information receiving device is used for receiving the earthquake warning information released by the warning information release device.

[0015] In the second aspect, an embodiment of the present invention further provides an earthquake parameter acquisition method, which is applied to the earthquake warning system. The earthquake warning system includes a control device and a plurality of detection devices, wherein the plurality of detection devices are distributed in an earthquake monitoring area. Each detection device includes three detection units distributed according to preset intervals and a data processing unit close to the three detection units. The three detection units are coupled with the corresponding data processing unit, and the data processing unit is coupled with the control device. The method includes: the detection unit acquires earthquake wave data, and sends the earthquake wave data to the corresponding data processing unit; the data processing unit processes the earthquake wave data sent by the three detection units corresponding to the data processing unit to obtain earthquake information, and sends the earthquake information to the control device, wherein the earthquake information includes P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude; the control device selects target detection devices from the plurality of detection devices according to a preset rule, and obtains earthquake parameters based on the earthquake information sent by the target detection devices, wherein the earthquake parameters include second source location and second earthquake magnitude. The preset rule includes: judging whether the source is within a detection area of a feature detection device, wherein the feature detection device is the detection device which fastest picks up a P wave earthquake phase; if the source is within the detection area of the feature detection device, matching the amplitude data of the feature detection device with a preset first threshold range to obtain a first target area, and selecting all the detection devices within the first target area as

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-5the target detection devices; and if the source is beyond the detection area of the feature detection device, matching the amplitude data of the feature detection device with a preset second threshold range to obtain a second target area, and selecting all the detection devices within the second target area as the target detection devices, wherein the first target area is smaller than the second target area.

[0016] Further, the step that the data processing unit processes the earthquake wave data sent by the three detection units corresponding to the data processing unit to obtain earthquake information includes: respectively performing P wave earthquake phase pickup on the earthquake wave data sent by the corresponding three detection units to obtain P wave earthquake phase arrival time and P wave amplitude data; acquiring positioning data of the corresponding three detection units; obtaining first source location and first earthquake magnitude according to the obtained P wave earthquake phase arrival time, P wave amplitude data and positioning data, and sending the P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude as the earthquake information.

[0017] According to the earthquake warning system based on acceleration sensors and the earthquake parameter acquisition method provided by the embodiments of the present application, the control device and the plurality of detection devices arranged in the earthquake monitoring area are provided, and each detection device includes three detection units distributed according to preset intervals and a data processing unit close to the three detection units. In each detection device, the data processing unit can process the earthquake wave data fast acquired by the corresponding three detection units to preliminarily obtain earthquake information, and then sends the obtained earthquake information to the control device, so that mass original earthquake data does not need to be transmitted to the control device in real time, the problem of delay caused by long-distance packing and network transmission of realtime earthquake data can be relieved, and the warning time can be increased. Then the control device selects target detection devices from these detection devices according to the preset rule, and obtains earthquake parameters according to the earthquake information sent by the target detection devices to further generate warning information according to the earthquake parameters. For different earthquake events, a plurality of target detection devices can be adaptively selected, and more accurate earthquake parameters are calculated according to the earthquake information sent by the selected target detection devices, which is beneficial to improving the accuracy of warning information in consideration of the limitation of warning time.

-62018200925 08 Feb 2018

Brief Description of the Drawings [0018] In order to illustrate the technical solution in the embodiments of the present invention more clearly, a brief introduction will be made below to the drawings required in the description of the embodiments. The drawings described below are example embodiments of the present invention only, and other drawings could be obtained based on the drawings by those of ordinary skill in the art without any creative effort.

[0019] Fig. 1 is a structural diagram of an earthquake warning system based on acceleration sensors according to a first embodiment of the present invention;

[0020] Fig. 2 is a schematic diagram of an earthquake warning principle provided by the prior art;

[0021] Fig. 3 is another structural diagram of the earthquake warning system based on acceleration sensors according to the first embodiment of the present invention;

[0022] Fig. 4 is a schematic diagram of a source location relation provided by the first embodiment of the present invention;

[0023] Fig. 5 is a schematic diagram of another source location relation provided by the first embodiment of the present invention;

[0024] Fig. 6 is a schematic diagram of a source location scene provided by the first embodiment of the present invention;

[0025] Fig. 7 is a schematic diagram of another source location scene provided by the first embodiment of the present invention;

[0026] Fig. 8 is a flow diagram of an earthquake parameter acquisition method provided by a second embodiment of the present invention;

[0027] Fig. 9 is a step flow diagram of step S200 in Fig. 8; and [0028] Fig. 10 is a step flow diagram of step S300 in Fig. 8.

[0029] Reference signs:

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-7earthquake warning system 1; control device 10; controller 110; second router 120; detection device 20; data processing unit 210; detection units 221, 222, 223; first router 230; warning information release device 30; warning information receiving device 40.

Detailed Description of the Embodiments [0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with the drawings in the embodiments of the present invention. It will be appreciated that the embodiments described are only example embodiments of the present invention, and not all of them. All of the other embodiments obtained by those of ordinary skill in the art without any creative effort based on the embodiments in the present invention shall fall into the protection scope of the present invention.

[0031] In the description of the present invention, it should be further noted that, unless otherwise specified and defined, the terms “set”, “coupled” and “connected” should be generally understood, e.g., “connected” may be directly connected or indirectly connected via a medium, and may refer to communication of the interiors of two components. The specific meanings of said terms in the present invention can be understood by those of ordinary skill in the art according to specific circumstances.

[0032] In the description, the relation terms such as first and second are merely used for distinguishing one entity or operation from the other entity or operation, rather than requiring or hinting any actual relation or sequence between the entities or operations. Moreover, the term “comprise”, “include” or other variant is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of factors includes not only those factors, but also other factors not listed definitely, or includes inherent factors of the process, method, article or equipment. In the absence of more limitations, the factor defined by the sentence “include one...” does not exclude other same factors in the process, method, article or equipment including said factors.

[0033] The existing earthquake warning system monitors earthquake waves by using a plurality of strong motion seismographs deployed in a warning target area or a potential source area, and the distance between earthquake stations is relatively long, which is usually more than or equal to 100 km. When the earthquake occurs, these strong motion seismographs monitor earthquake waves successively, and directly transmit the acquired earthquake wave

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-8data to the same warning center. The warning center calculates warning information and then releases it. Considering the limitation of warning time, the warning center usually fuses the earthquake wave data sent by three strong motion seismographs that detect the earthquake event, and calculates the warning information, so the accuracy is difficult to guarantee.

[0034] Thus, in order to effectively solve the technical problem that the accuracy of warning information is difficult to guarantee in the prior art, the embodiments of the present invention provides an earthquake warning system based on acceleration sensors and an earthquake parameter acquisition method.

[0035] Referring to Fig. 1, an earthquake warning system 1 based on acceleration sensors according to a first embodiment of the present invention includes a control device 10 and a plurality of detection devices 20. The plurality of detection devices 20 are distributed in an earthquake monitoring area. The earthquake monitoring area is a potential source area. It should be noted that the quantity of the detection devices 20 in Fig. 1 is merely schematic, and the specific quantity of the detection devices 20 in this system is not limited and can be set according to actual needs.

[0036] As shown in Fig. 1, each detection device 20 includes three detection units (respectively corresponding to 221, 222 and 223 in Fig. 1) distributed according to preset intervals and a data processing unit 210 close to the three detection units. In each detection device 20, the three detection units are coupled with the corresponding data processing unit 210, and the data processing unit 210 is coupled with the control device 10. In each detection device 20, the detection unit is used for acquiring earthquake wave data via acceleration sensors, and sending the earthquake wave data to the corresponding data processing unit 210; the data processing unit 210 is used for processing the earthquake wave data sent by the three detection units corresponding to the data processing unit 210 to obtain earthquake information, and sending the earthquake information to the control device 10, wherein the earthquake information includes P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude. The control device 10 is used for selecting target detection devices from the plurality of detection devices 20 according to a preset rule, and obtaining earthquake parameters based on the earthquake information sent by the target detection devices, wherein the earthquake parameters include second source location and second earthquake magnitude. It should be noted that the preset rule can be set according to different warning demands. For different earthquake events and different warning demands, the number of the detection devices 20 selected as the target detection devices can

-92018200925 08 Feb 2018 be different.

[0037] At the moment, in each detection device 20, the data processing unit 210 close to the three detection units can fast process the earthquake wave data acquired by the three detection units to preliminarily obtain earthquake information, and then sends the obtained earthquake information to the control device 10, so that mass original earthquake data does not need to be transmitted to the control device 10 in real time, the problem of delay caused by long-distance packing and network transmission of real-time earthquake data can be relieved, and the warning time can be increased. In addition, for different earthquake events, the control device 10 can adaptively select a plurality of target detection devices according to the preset rule, and obtains more accurate earthquake parameters according to the earthquake information sent by the selected target detection devices in order to further generate warning information according to the earthquake parameters, thereby improving the accuracy of warning information in consideration of the limitation of warning time.

[0038] Further, in actual application, the detection device often falsely warns due to a nonearthquake event. For this, the data processing unit can eliminate non-earthquake interference signals by analyzing the correlation of vibration waveforms of the three detection units. When the correlation coefficient is greater than a threshold, it is considered that the earthquake event detection is valid; and when the correlation coefficient is smaller than the threshold, it is considered that there are external interference signals. Thus, the accuracy of earthquake detection can be improved.

[0039] Specifically, it is supposed that the waveform output signals of the first detection unit are x1(t), y1(t) and z1(t), the waveform output signals of the second detection unit are x2(t), y2(t) and z2(t), and the waveform output signals of the third detection unit are x3(t), y3(t) and z3(t), wherein the components x(t) and y(t) are output signals in two directions of the horizontal axis, and the component z(t) is an output signal in the direction of the vertical axis. In order to reduce the calculation quantity of a signal cross-correlation algorithm, improve the efficiency of the algorithm and increase the warning time, the output in the x axis and the z axis are selected to calculate cross-correlation coefficients, and the formulas are respectively as follows:

ΣίΗ,-Η,1Η₂~Η₂]

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-10^HX = [*1 (9 ~ *1 (0] + F₂ (0 - % (01 + [*3 (0 - *₃ (0] ^H2 = [^Zl (0 - ^Z1 (0] + [^Z2 (0 - ^Z2 (0] + t^Z3 (0 - ^Z3 (0]

Wherein, γ is a normalized global cross-correlation coefficient of the three detection units, x1(t), x2(t) and x3(t) are respectively x-axis output signals of the three detection units, z1(t), z2(t) and z3(t) are respectively z-axis output signals of the three detection units, x_}(t), x₂(0 > x₃(t) and Zj(Z), z₂(t), z₃(t) are respectively corresponding means thereof.

[0040] It should be noted that, in order to simplify the detection devices 20 and obtain the earthquake information as fast as possible, in the present embodiment, each detection device 20 is provided with three detection units. The data processing unit 210 obtains P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude according to the earthquake wave data acquired by the three detection units. Of course, in other embodiments of the present invention, each detection device 20 may also be provided with more than three detection units.

[0041] Fig. 2 shows a schematic diagram of an earthquake warning principle. It is supposed in Fig. 2 that A indicates a source, B indicates an earthquake wave acquisition point, C indicates a warning target area, D indicates an epicentral position, si indicates the distance from the epicenter to the acquisition point, s₂ indicates the distance from the epicenter to the warning target area, and h indicates a source depth. When the earthquake occurs at A, P waves and S waves are emitted to four sides, it is supposed that the velocity of P waves is i/_pand the velocity of S waves is i/_s, then the time foe when the earthquake warning system acquires the P waves is: --. It is supposed that the processing time from the moment ^Vp when the earthquake warning system acquires the P waves to the moment of obtaining earthquake parameters is f_c. It should be noted that, as the propagation velocity of electromagnetic waves is 300, 000 km/s, the time required when the electromagnetic waves propagate warning information to the warning target area can be neglected. Thus, the earthquake avoidance time left to the warning target area, namely warning time 7, can be:

„ jv+D 7(4+*²) , [0042] It can be seen from the above formulas that the time <ab when the earthquake

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-11warning system acquires the P waves and the processing time f_c are key factors affecting the warning time.

[0043] In the prior art, the distance between two adjacent strong motion seismographs is usually more than or equal to 100 km. The inventor discovers via studies, the existing earthquake warning system that can fastest detect an earthquake event and is triggered is arranged in such a manner that, when the earthquake occurs, the first strong motion seismograph is just at the epicenter, while the second and third strong motion seismographs are on the circle using the first strong motion seismograph as the center and having the radius of 100 km. At the moment, if the highest propagation velocity 7 km/s of the P waves in the crust is selected for calculating, the time is 14.29 s later than the time when each of the first, second and third strong motion seismographs acquires earthquake waves. In this case, after the earthquake waveform data acquired by the first strong motion seismograph is transmitted for a long distance to the distal warning center, the warning center waits for at least 14.29 s or more and then calculates the location of the source. That is to say, the time foe when the earthquake warning system acquires the P waves is relatively long, and the processing time t_c is also long, so that the forecasting timeliness is poor and the warning time is reduced.

[0044] In this embodiment, the earthquake monitoring area is large, and in order that the detection units can fast acquire earthquake waves so as to increase the warning time as far as possible within the upper limit of warning time, the distance between the detection devices 20 in the earthquake warning system 1 is relatively short. For example, the distance may be 30-50 km, i.e., the distance between the two adjacent detection devices is 30-50 km. In a preferred embodiment of the present invention, the detection devices 20 are specifically arranged according to an earthquake intensity zoning map and an earthquake dynamic peak acceleration zoning map, i.e., arranged in a high peak acceleration zone.

[0045] Moreover, in order to reduce the transmission distance of earthquake wave data sent by the detection units as much as possible and quickly obtain earthquake information, the three detection units of each detection device 20 are arranged relatively close. Thus, the time when the three detection units acquire the P waves can be reduced, said processing time t_ccan also be reduced, and the warning time can be increased. For example, the distance may be 1-5 km, i.e., the distance between two adjacent detection units in each detection device 20 is 1-5 km. In a preferred embodiment of the present invention, the distance of the three detection units in each detection device 20 is 1-2 km, and at this time, the calculation time of the earthquake information can be improved within 1s.

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-12[0046] It could be understood that, in this earthquake warning system 1, the detection devices 20 are arranged relatively close and arranged according to the earthquake intensity zoning map and the earthquake dynamic peak acceleration zoning map, and the three detection units in each detection device 20 are also arranged relatively close, so that the time when this system acquires the P waves, i.e., foe, can be effectively reduced. A data processing unit 210 is arranged in each detection device 20, the data processing unit 210 fast processes the earthquake wave data sent by the three detection units corresponding to it and sends the preliminarily obtained earthquake information to the control device 10, and the control device 10 can further process the earthquake information to obtain earthquake parameters, so that mass original earthquake data is prevented from being transmitted to the control device 10 in real time, the problem of delay caused by long-distance packing and network transmission of real-time earthquake data is relieved, and said processing time f_c can be effectively reduced. Thus, compared with the prior art, the present earthquake warning system 1 can increase the warning time within the upper limit of the warning time.

[0047] In the detection device 20, the data processing unit 210 is arranged close to the corresponding three detection units, so a wired communication mode or a wireless communication mode can be adopted between the detection units and the data processing unit 210. When the wired communication mode is adopted, the detection units and the data processing unit 210 are correspondingly provided with data communication interfaces, e.g., Ethernet interfaces and RS-232 interfaces, to realize real-time transmission of data. When the wireless communication mode is adopted, the detection units and the data processing unit 210 are correspondingly provided with wireless communication modules, e.g., WIFI IEEE 802.11b modules or Zigbee modules, etc. It could be understood that, in each detection device 20, the data processing unit 210 can be integrated with one of the corresponding three detection units, or separated from the corresponding three detection units.

[0048] Specifically, the detection unit includes acceleration sensors and a recorder. The output end of the acceleration sensor is coupled with the input end of the recorder, and the output end of the recorder is coupled with the corresponding data processing unit 210.

[0049] The acceleration sensor is used for acquiring earthquake wave acceleration signals. For example, MEMS three-axis acceleration sensors can be adopted.

[0050] The recorder is used for processing the acceleration signals acquired by the acceleration sensor to obtain earthquake wave data, and sending the earthquake wave data to

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-13the corresponding data processing unit 210. In order to distinguish the arrival time difference of P wave earthquake phases acquired by the three detection units arranged relatively close in each detection device later, the recorders are preferably high-frequency recorders in this embodiment. Specifically, recorders with preset sampling frequencies can be designed according to actual situations. For example, when the distance of the three detection units in each detection device is 1-5 km, recorders having the sampling frequencies up to 10 kHz can be adopted.

[0051] Specifically, in this embodiment, the recorder may include a preprocessing module, an analog-digital conversion module, a processor, a storage module and a timing module. The input end of the preprocessing module is coupled with the output end of the acceleration sensor, the input end of the analog-digital conversion module is coupled with the output end of the preprocessing module, the output end of the analog-digital conversion module is coupled with the processor, and both the timing module and the storage module are coupled with the processor.

[0052] The preprocessing module is used for filtering and amplifying the output signals of the acceleration sensor by adopting a fully differential channel. In order to improve the sampling frequency and effectively pick up P wave earthquake phases, the recorder provided in the embodiment of the present invention can adopt a high-precision synchronous 24-bit Σ-Δ A/D quantizer and a digital decimation filter.

[0053] The processor may be a chip with a data processing function, such as a singlechip, a DSP, an FPGA or an ARM, etc. As an implementation, a high-performance FPGA+ARM dualcore processor can be adopted as the processor, and the resources of the processor are extended by extending an external program storage area and a data storage area, so that a big enough program code storage space can be obtained on the one hand, and on the other hand, the system can reach big enough data throughput to adapt to mass data buffer and operation.

[0054] The storage module is used for storing the acquired earthquake wave data to facilitate subsequent processing and interpretation. As an implementation, the storage module may be an SD storage card. Then, the processor can establish a catalog and a file system in the SD storage card via an SD storage card read-write module, and write data into a file.

[0055] The timing module adopts coordinated universal time (UTC), and is provided with a

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-14built-in timing signal receiving unit. The built-in timing signal receiving unit may be a satellite positioning receiver. The acquisition time of earthquake waves can be recorded accurately.

[0056] Of course, the recorder further includes a power module, which is used for supplying power to each electric module. As an implementation, the module is a multi-voltage and highefficiency power management module adopting an optimal combination of a switch adjuster and a linear adjuster to realize wide input of 6V-14V and having robustness. In order to improve the reliability and the stability, the power module not only provides multiple voltage rails, but also has the functions of appropriate time series control, over-current and overvoltage detection and protection as well as voltage monitoring.

[0057] In this embodiment, the data processing unit 210 includes a chip with a data processing function, such as a singlechip, a DSP, an FPGA or an ARM, etc. As an implementation, the data processing unit 210 may be a computer.

[0058] Specifically, the data processing unit 210 is used for: respectively performing P wave earthquake phase pickup on the earthquake wave data sent by the corresponding three detection units, detecting and triggering an earthquake event, and then obtaining P wave earthquake phase arrival time and P wave amplitude data; acquiring positioning data of the corresponding three detection units; obtaining first source location and first earthquake magnitude according to the obtained P wave earthquake phase arrival time, P wave amplitude data and positioning data; and sending the P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude as the earthquake information to the control device 10.

[0059] The P wave earthquake phase pickup method adopted by the data processing unit 210 may be a short and long time averaging (STA/LTA) method, an AIC criterion method, or a combination method of the STA/LTA and AIC criterion methods, etc. By respectively performing P wave earthquake phase pickup on the earthquake wave data sent by the corresponding three detection units, the data processing unit 210 can obtain P wave earthquake phase arrival time t1, t2 and t3 and P wave amplitude data acquired by the three detection units respectively.

[0060] Specifically, the positioning data may be the one transmitted to the data processing unit 210 in real time after the corresponding three detection units respectively acquire self location, or pre-stored in the data processing unit 210.

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-15[0061] As an implementation, the P wave amplitude data is the amplitude of picked P waves. As another implementation, the P wave amplitude data includes the amplitude of picked P waves and P wave form data in a preset time period. The P wave form data can be used for backup to facilitate subsequent analysis. The time length of the preset time period is set according to requirements, and the starting time of the preset time period is the initial time when a P wave earthquake phase is picked up.

[0062] In this embodiment, the control device 10 is separated from each detection device 20, and the distance between each detection device 20 and the control device 10 is relatively long. In a preferred embodiment of the present invention, a wireless communication mode is adopted between the control device 10 and each detection device 20. Then, referring to Fig. 3, besides the data processing unit 210 and the three detection units, each detection device 20 further includes a first router 230, and correspondingly, the control device 10 includes a controller 110 and a second router 120. In each detection device 20, the first router 230 is coupled with the data processing unit 210, and the second router 120 is coupled with the controller 110. The second router 120 is connected with each first router 230 via a cable, to realize data transmission between each detection device 20 and the control device 10. The first router 230 sends the earthquake information processed by the data processing unit 210 to the second router 120, and the second router 120 sends the received earthquake information to the controller 110. Of course, in the earthquake warning system shown in Fig. 3, the quantity of the detection devices 20 is merely schematic, and the specific quantity of the detection devices 20 in this system is not limited.

[0063] Specifically, the controller 110 may include a chip with a data processing function such as a singlechip, a DSP, an FPGA or an ARM, and is used for selecting target detection devices from the plurality of detection devices 20 according to the preset rule, and obtaining earthquake parameters according to the earthquake information sent by the target detection devices, wherein the earthquake parameters include second source location and second earthquake magnitude. For example, the controller 110 may adopt a computer.

[0064] It is discovered by the inventor that, when the source is located in the detection area of one detection device 20, its position can be accurately determined by fusing the earthquake data acquired by the three detection units included by the detection device 20. When the source is located beyond the detection area of the detection device 20, its position cannot be accurately obtained by only fusing the earthquake data acquired by the three detection units included by one detection device 20.

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-16[0065] In addition, when the source is located in the detection area of one detection device 20, its position can be accurately determined by fusing the earthquake data acquired by the three detection units included by the detection device 20, but in practical application, the earthquake event may also be caused by environmental interference of an arrangement district, e.g., for a detection device 20 arranged nearby a farmhouse, vibration waves are also picked up when people’s motorcycles pass by, and at this moment, if only the earthquake data acquired by the three detection units included by the detection device 20 is fused, accurate warning information will not be obtained.

[0066] Thus, in order to obtain accurate warning information for different earthquake events, a preset rule is set in the control device 10 ofthe earthquake warning system 1 provided by the embodiment of the present invention, so that target detection devices can be adaptively selected from the arranged detection devices 20, and more accurate earthquake parameters are obtained according to the earthquake information sent by the selected target detection devices to guarantee the accuracy of warning information. The specific preset rule adopted by the embodiment ofthe present invention will be described below.

[0067] As an implementation, the earthquake information received by the control device 10 further includes P wave amplitude data. The preset rule may be as follows: judging whether the source is within a detection area of a feature detection device, wherein the feature detection device is the detection device 20 that fastest picks up a P wave earthquake phase; if the source is within the detection area ofthe feature detection device, matching the amplitude data of the feature detection device with a preset first threshold range to obtain a first target area, and selecting all the detection devices 20 within the first target area as the target detection devices; and if the source is beyond the detection area of the feature detection device, matching the amplitude data of the feature detection device with a preset second threshold range to obtain a second target area, and selecting all the detection devices 20 within the second target area as the target detection devices, wherein the first target area is smaller than the second target area.

[0068] For example, under the condition that the source is judged to be within the detection area of the feature detection device, when two detection devices 20 are located in the first target area, the two detection devices 20 are selected as target detection devices.

[0069] Specifically, the first source location includes a first epicenter location. A specific implementation of judging whether the source is within the detection area of the feature

-172018200925 08 Feb 2018 detection device may be as follows:

acquiring a detection area range of the feature detection device, wherein the feature detection device is the detection device 20 that fastest picks up a P wave earthquake phase; acquiring the first epicenter location sent by the feature detection device; judging whether the first epicenter location is within the detection area range; if the first epicenter location is within the detection area range, determining that the source is within the detection area of the feature detection device, and if the first epicenter location is not within the detection area range, determining that the source is beyond the detection area of the feature detection device. It should be noted that the detection device 20 that fastest picks up a P wave earthquake phase is the one corresponding to the earthquake information first received by the control device 10.

[0070] In this embodiment, the detection area range of each detection device 20 in the system can be pre-stored in the control device 10. Or, each detection device 20 transmits positioning data of the included three detection units to the control device 10 in real time. The positioning data of the detection unit is its coordinates, and the detection area range of the detection device 20 is an area encircled by the coordinates of the three detection units included by the detection device 20.

[0071] For example, the first epicenter location sent by the feature detection device is coordinates (X, Y), and the coordinates of the three detection units A1, A2 and A3 included by the feature detection device are respectively (x1, y1), (x2, y2) and (x3, y3). At the moment, whether the coordinate value X is within the range of the three coordinate values x1, x2 and x3 and whether the coordinate value Y is within the range of the three coordinate values y1, y2 and y3 are judged. When the coordinate value X is within the range of the three coordinate values x1, x2 and x3 and the coordinate value Y is within the range of the three coordinate values y1, y2 and y3, the first epicenter location is judged to be within the detection area range of the feature detection device, as shown in Fig. 4. When the coordinate value X is not within the range of the three coordinate values x1, x2 and x3 and/or the coordinate value Y is not within the range of the three coordinate values y1, y2 and y3, the first epicenter location is judged to be not within the detection area range of the feature detection device, as shown in Fig. 5.

[0072] The first target area and the second target area are areas using the feature detection device as the center and expanded outward a preset range. Further, the earthquake information sent from each detection device 20 to the control device 10 includes P wave earthquake phase arrival time acquired by each detection unit. A specific implementation of

2018200925 08 Feb 2018

-18matching the amplitude data of the feature detection device with a preset first threshold range to obtain a first target area may be as follows:

acquiring a P wave amplitude acquired by a feature detection unit as a feature amplitude, wherein the feature detection unit is the detection unit having shortest P wave earthquake phase arrival time in said feature detection device; matching the feature amplitude with the preset first threshold range to obtain a radius value corresponding to the feature amplitude as a feature radius, wherein the first threshold range includes a plurality of subranges, and each subrange corresponds to a radius value; and acquiring an area using the feature detection unit as the center of circle and using the feature radius as the radius as the first target area.

[0073] In this embodiment, the implementation of matching the amplitude data of the feature detection device with a preset second threshold range to obtain a second target area is similar to said implementation of obtaining the first target area, the difference lies in that the second threshold range is different from the first threshold range, i.e., the plurality of subranges included by the second threshold range are different from those included by the first threshold range, and the radius value corresponding to each subrange is also different, which will not be redundantly described herein.

[0074] It could be understood that, in order to obtain relatively accurate earthquake parameters, in the same earthquake warning system 1, compared with the earthquake event that the source is within the detection area of the feature detection device, the earthquake event that the source is beyond the detection area of the feature detection device needs to fuse more detection devices 20 for calculating earthquake parameters, i.e., more detection devices 20 are selected as target detection devices. That is to say, the first target area is smaller than the second target area, i.e., the feature radius corresponding to the first target area is smaller than that corresponding to the second target area.

[0075] For example, in the scene of Fig. 6, detection devices J1, J2, J3, J4, J5, J6 and J7 distributed in an earthquake monitoring area are described as an example. In Fig. 6, the small triangle filled black indicates an epicenter location, that is to say, the detection device J1 in the scene is a feature detection device, the source is located in the detection area of J1, and the circular area encircled by black dots in Fig. 6 is the first target area. At the moment, the detection devices J1, J2 and J3 within the first target area are the selected target detection devices. In addition, Fig. 7 shows a schematic diagram indicating that the source is beyond the detection area of the feature detection device, wherein the small triangle filled with black indicates an epicenter location. It is supposed that, in Fig. 7, the feature detection device is still

2018200925 08 Feb 2018

-19J1, and the circular area encircled by black dots in Fig. 6 is the second target area. At the moment, the detection devices J1, J2, J3, J4 and J5 within the second target area are the selected target detection devices.

[0076] Of course, except the above implementation, other preset rule may also be set according to actual situations, for example, when the requirement for magnitude precision of the earthquake warning system is relatively low, the preset rule may be as follows: judging whether the source is within a detection area of a feature detection device, wherein the feature detection device is the detection device 20 that fastest picks up a P wave earthquake phase; when the source is within the detection area of the feature detection device, selecting the feature detection device as the target detection device; and if the source is beyond the detection area of the feature detection device, matching the amplitude data of the feature detection device with a preset second threshold range to obtain a second target area, and selecting all the detection devices 20 within the second target area as the target detection devices.

[0077] As an implementation, the above step of obtaining earthquake parameters according to the earthquake information sent by the target detection devices may include: if the source is within the detection area of the feature detection device, selecting the first source location sent by the feature detection device as a second source location, calculating an arithmetic average of the first earthquake magnitudes sent by the target detection devices, and selecting the arithmetic average as a second earthquake magnitude; if the source is beyond the detection area of the feature detection device, acquiring an arithmetic average of the first source location sent by the target detection devices, selecting the arithmetic average as a second source location, calculating an arithmetic average of the first earthquake magnitudes sent by the target detection devices, and selecting the arithmetic average as a second earthquake magnitude.

[0078] In this embodiment, the source location may be indicated by epicenter coordinates. For example, in the scene of Fig. 6, the target detection devices include detection devices J1, J2 and J3, wherein the detection device J1 is a feature detection device. It is supposed that the first epicenter coordinates included by the first source location sent by the detection device J1 are (X1, Y1) and the first earthquake magnitude is M1, the first epicenter coordinates included by the first source location sent by the detection device J2 are (X2, Y2) and the first earthquake magnitude is M2, the first epicenter coordinates included by the first source location sent by the detection device J3 are (X3, Y3) and the first earthquake magnitude is M3.

- 20If the source is within the detection area of the feature detection device, the second epicenter coordinates are (X1, Y1), and the second earthquake magnitude is (M1+M2+M3)/3. If the source is beyond the detection area of the feature detection device, the second epicenter

2018200925 08 Feb 2018 coordinates are

X1+X2+X3 Y1+Y2+Y3 (M1+M2+M3)/3.

and the second earthquake magnitude is [0079] As another implementation, when the second earthquake magnitude is calculated according to the first earthquake magnitudes sent by the target detection devices, if the target detection devices exceed a preset number, after the step of acquiring the first earthquake magnitudes sent by the target detection devices, the maximum and the minimum can be removed from the acquired first earthquake magnitudes, and then the arithmetic average of the remaining first earthquake magnitudes is calculated as the second earthquake magnitude. The preset number can be set according to multiple tests. The accuracy of the second earthquake magnitude calculation result can thus be improved.

[0080] Of course, the earthquake warning system 1 provided by the embodiment of the present invention further includes a warning information release device 30 and a warning information receiving device 40, as shown in Fig. 3. Both the control device 10 and the warning information receiving device 40 are coupled with the warning information release device 30.

[0081] At the moment, the above control device 10 is also used for sending the obtained earthquake parameters to the warning information release device 30. The warning information release device 30 is used for generating and releasing earthquake warning information according to the earthquake parameters. The warning information receiving device 40 is used for receiving the earthquake warning information released by the warning information release device 30. Thus, related departments can quickly master the earthquake intensity and the earthquake damage distribution situation, and timely take effective relief measures to reduce the loss of earthquake damage.

[0082] Specifically, the warning information release device 30 may be an information release platform such as an Internet platform, a television or a broadcast platform, etc. The warning information receiving device 40 may be a personal terminal such as a radio, a television, a mobile phone, a tablet computer, etc.

[0083] To sum up, the earthquake warning system 1 provided by the embodiment of the

2018200925 08 Feb 2018

- 21present invention is provided with the control device 10 and the plurality of detection devices 20 arranged in the earthquake monitoring area, and each detection device 20 includes three detection units distributed according to preset intervals and a data processing unit 210 close to the three detection units. For each detection device 20, the data processing unit 210 can fast process the earthquake wave data acquired by the corresponding three detection units to preliminarily obtain earthquake information, and then sends the obtained earthquake information to the control device 10. Then the control device 10 selects target detection devices from these detection devices 20 according to the preset rule, and obtains earthquake parameters according to the earthquake information sent by the target detection devices to further generate warning information according to the earthquake parameters. Compared with the prior art, mass original earthquake data does not need to be transmitted to the control device 10 in real time, so that the problem of delay caused by long-distance and network transmission of real-time earthquake data packing can be relieved, and the warning time can be increased. Moreover, for different earthquake events, a plurality of target detection devices can be adaptively selected, and more accurate earthquake parameters are calculated according to the earthquake information sent by the selected target detection devices, which is beneficial to improving the accuracy of warning information in consideration of the limitation of warning time.

[0084] Further, in this earthquake warning system 1, the detection devices 20 are arranged relatively close and arranged according to the earthquake intensity zoning map and the earthquake dynamic peak acceleration zoning map, and the three detection units in each detection device 20 are also arranged relatively close, so that the time when this system acquires the P waves can be effectively reduced, and the warning time can be increased within the upper limit of the warning time.

[0085] In addition, referring to Fig. 8, a second embodiment of the present invention further provides an earthquake parameter acquisition method, which is applied to the earthquake warning system 1 provided by the first embodiment. As shown in Fig. 1, the earthquake warning system 1 includes a control device 10 and a plurality of detection devices 20, wherein the plurality of detection devices 20 are distributed in an earthquake monitoring area. Each detection device 20 includes three detection units (respectively corresponding to 221, 222 and 223 in Fig. 1) distributed according to preset intervals and a data processing unit 210 close to the three detection units. In each detection device 20, the three detection units are coupled with the corresponding data processing unit 210, and the data processing unit 210 is coupled with the control device 10. As shown in Fig. 8, the method includes:

2018200925 08 Feb 2018

- 22[0086] Step S100, the detection unit acquires earthquake wave data, and sends the earthquake wave data to the corresponding data processing unit;

wherein the detection unit acquires earthquake wave data via acceleration sensors, and sends the acquired earthquake wave data to the corresponding data processing unit.

[0087] Step S200, the data processing unit processes the earthquake wave data sent by the three detection units corresponding to the data processing unit to obtain earthquake information, and sends the earthquake information to the control device, wherein the earthquake information includes P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude;

[0088] Step S300, the control device selects target detection devices from the plurality of detection devices according to a preset rule, and obtains earthquake parameters based on the earthquake information sent by the target detection devices, wherein the earthquake parameters include second source location and second earthquake magnitude.

[0089] Specifically, as shown in Fig. 9, the step that the data processing unit processes the earthquake wave data sent by the three detection units corresponding to the data processing unit to obtain earthquake information includes:

step S201, respectively performing P wave earthquake phase pickup on the earthquake wave data sent by the corresponding three detection units to obtain P wave earthquake phase arrival time and P wave amplitude data;

step S202, acquiring positioning data of the corresponding three detection units;

step S203, obtaining first source location and first earthquake magnitude according to the obtained P wave earthquake phase arrival time, P wave amplitude data and positioning data, and sending the P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude as the earthquake information.

[0090] As shown in Fig. 10, the step that the control device selects target detection devices from the plurality of detection devices according to a preset rule includes: step S301, judging whether the source is within a detection area of a feature detection device, wherein the feature detection device is the detection device that fastest picks up a P wave earthquake phase;

if the source is within the detection area of the feature detection device, executing step S302; if the source is beyond the detection area of the feature detection device, executing step S303; step S302, matching the amplitude data of the feature detection device with a preset first

2018200925 08 Feb 2018

- 23threshold range to obtain a first target area, and selecting all the detection devices within the first target area as the target detection devices; and step S303, matching the amplitude data of the feature detection device with a preset second threshold range to obtain a second target area, and selecting all the detection devices within the second target area as the target detection devices.

[0091] The first target area is smaller than the second target area.

[0092] Those skilled in the art could clearly learn that, for the sake of convenience and simplicity, for the specific working processes of the method described above, please refer to the corresponding processes in the aforementioned system, device and unit embodiment, and they are thus not redundantly described herein.

[0093] According to the earthquake parameter acquisition method provided by the embodiment of the present invention, the data processing unit in each detection device can fast process the earthquake wave data acquired by the corresponding three detection units to preliminarily obtain earthquake information, and then sends the obtained earthquake information to the control device; the control device selects target detection device from these detection devices according to the preset rule, and obtains earthquake parameters according to the earthquake information sent by the target detection device. Compared with the prior art, mass original earthquake data does not need to be transmitted to the control device in real time, so that the problem of delay caused by long-distance packing and network transmission of real-time earthquake data can be relieved, and the warning time can be increased. Moreover, a plurality of target detection devices can be adaptively selected, and more accurate earthquake parameters are calculated according to the earthquake information sent by the selected target detection devices, which is beneficial to improving the accuracy of warning information in consideration of the limitation of warning time.

[0094] The preferred embodiments of the invention not only offer increased accuracy and additional advance warning over prior art systems, but are better suited to a wide variety of geological conditions such as are encountered in exploration. Moreover, the preferred embodiments are also more applicable to remote environments as they do not require the real time transmission of the mass original earthquake data. This allows the embodiments to be used in many different locations, including those only having access to lower bandwidth or less stable capable communications systems. This allows the preferred embodiments of the invention to be particularly applicable for use in locations where there is exploration for

2018200925 08 Feb 2018

- 24geothermal energy sources and the operation of such sources. In addition to improving the ability to protect assets should there be an earthquake, the embodiments of the invention are able to assist by providing increased time for personnel to more safely prepare themselves. A number of these advantages also make the embodiments advantageously applicable to the exploration and operation of other below ground energy sources including shale gas sources, other new energy sources, and more conventional sources.

[0095] Although the preferred embodiments of the present invention are described, other variations and modifications could be made to these embodiments by those skilled in the art once they get basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all the variations and modifications falling into the scope ofthe present invention.

[0096] Obviously, various modifications and variations could be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention. Thus, provided these modifications and variations of the present invention fall into the scope of the claims of the present invention and equivalent technologies thereof, the present invention is also intended to include these modifications and variations.

- 252018200925 08 Feb 2018

Claims

CLAIMS:

1. An earthquake warning system based on acceleration sensors, comprising a control device and a plurality of detection devices, wherein:

the plurality of detection devices are distributed in an earthquake monitoring area;

each detection device comprises three detection units distributed according to preset intervals and a data processing unit closes to the three detection units, the three detection units are coupled with the corresponding data processing unit, and the data processing unit is coupled with the control device;

the detection unit is used for acquiring earthquake wave data via acceleration sensors, and sending the earthquake wave data to the corresponding data processing unit;

the data processing unit is used for processing the earthquake wave data sent by the three detection units corresponding to the data processing unit to obtain earthquake information, and sending the earthquake information to the control device, wherein the earthquake information comprises P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude;

the control device is used for selecting target detection devices from the plurality of detection devices according to a preset rule, and obtaining earthquake parameters based on the earthquake information sent by the target detection devices, wherein the earthquake parameters comprise second source locations and second earthquake magnitudes; and the preset rule comprises:

judging whether the source is within a detection area of a feature detection device, wherein the feature detection device is the detection device which fastest picks up a P wave earthquake phase;

if the source is within the detection area of the feature detection device, matching the amplitude data of the feature detection device with a preset first threshold range to obtain a first target area, and selecting all the detection devices within the first target area as the target detection devices; and if the source is beyond the detection area of the feature detection device, matching the amplitude data of the feature detection device with a preset second threshold range to obtain a second target area, and selecting all the detection devices within the second target area as the target detection devices, wherein the first target area is smaller than the second target area.

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- 262. The system according to claim 1, wherein the data processing unit is specifically used for:

respectively performing P wave earthquake phase pickup on the earthquake wave data sent by the corresponding three detection units to obtain P wave earthquake phase arrival time and P wave amplitude data;

acquiring positioning data of the corresponding three detection units;

obtaining first source locations and first earthquake magnitudes according to the obtained P wave earthquake phase arrival time, P wave amplitude data and positioning data; and sending the P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude as the earthquake information to the control device.

3. The system according to claim 1 or claim 2, wherein the preset intervals are 1-5 km.

4. The system according to any one of claims 1 to 3, wherein the interval of two adjacent detection devices is 30-50 km.

5. The system according to claim 1, wherein:

the detection unit comprises a recorder having an input end;

the output end of the acceleration sensors is coupled with the input end of the recorder, and the output end of the recorder is coupled with the corresponding data processing unit;

the acceleration sensors are used for acquiring earthquake wave acceleration signals, and sending the acceleration signals to the recorder; and the recorder is used for processing the acceleration signals to obtain earthquake wave data, and sending the earthquake wave data to the corresponding data processing unit.

6. The system according to any one of claims 1 to 5, wherein:

each detection device further comprises a first router, and the control device comprises a controller and a second router;

the first router is coupled with the data processing unit, the second router is coupled with the controller, and the second router is coupled with each first router;

the first router is used for sending the earthquake information processed by the data processing unit to the second router;

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- 27the second router is used for sending the received earthquake information to the controller; and the controller is used for selecting target detection devices from the plurality of detection devices according to the preset rule, and obtaining earthquake parameters based on the earthquake information sent by the target detection devices, wherein the earthquake parameters comprise second source location and second earthquake magnitude.

7. The system according to any one of claims 1 to 6, further comprising a warning information release device, which is coupled with the control device, wherein;

the control device is also used for sending the earthquake parameters to the warning information release device; and the warning information release device is used for generating and releasing earthquake warning information according to the earthquake parameters.

8. The system according to claim 7, further comprising a warning information receiving device which is coupled with the warning information release device, wherein the warning information receiving device is used for receiving the earthquake warning information released by the warning information release device.

9. An earthquake parameter acquisition method, applied to an earthquake warning system, wherein the earthquake warning system comprises a control device and a plurality of detection devices, the plurality of detection devices are distributed in an earthquake monitoring area, each detection device comprises three detection units distributed according to preset intervals and a data processing unit close to the three detection units, the three detection units are coupled with the corresponding data processing unit, the data processing unit is coupled with the control device, and the method comprises the steps of:

the detection unit acquiring earthquake wave data, and sending the earthquake wave data to the corresponding data processing unit;

the data processing unit processing the earthquake wave data sent by the three detection units corresponding to the data processing unit to obtain earthquake information, and sending the earthquake information to the control device, wherein the earthquake information comprises P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude;

the control device selecting target detection devices from the plurality of detection devices according to a preset rule, and obtaining earthquake parameters based on the

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- 28earthquake information sent by the target detection devices, wherein the earthquake parameters comprise second source location and second earthquake magnitude; and the preset rule comprising:

judging whether the source is within a detection area of a feature detection device, wherein the feature detection device is the detection device which fastest picks up a P wave earthquake phase;

if the source is within the detection area of the feature detection device, matching the amplitude data of the feature detection device with a preset first threshold range to obtain a first target area, and selecting all the detection devices within the first target area as the target detection devices; and if the source is beyond the detection area of the feature detection device, matching the amplitude data of the feature detection device with a preset second threshold range to obtain a second target area, and selecting all the detection devices within the second target area as the target detection devices, wherein the first target area is smaller than the second target area.

10. The method according to claim 9, wherein the step of the data processing unit processing the earthquake wave data sent by the three detection units corresponding to the data processing unit to obtain earthquake information comprises:

respectively performing P wave earthquake phase pickup on the earthquake wave data sent by the corresponding three detection units to obtain P wave earthquake phase arrival time and P wave amplitude data;

acquiring positioning data ofthe corresponding three detection units; and obtaining first source location and first earthquake magnitude according to the obtained P wave earthquake phase arrival time, P wave amplitude data and positioning data, and sending the P wave earthquake phase arrival time, P wave amplitude data, first source location and first earthquake magnitude as the earthquake information.

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