JP2016085146A - Earthquake alarm system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake alarm system capable of distributing an earthquake alarm in a standpoint considering safety.SOLUTION: An earthquake alarm system 300 comprises: a data processing part for dividing an area to be an object of an alarm into plural areas, then arranging one or more observation points on each of the areas, and performing data processing based on an area earthquake motion index which is calculated by a reception part 201; and an earthquake alarm processing device 200 having a distribution part for outputting an alarm according to a processing result of the data processing part. The earthquake alarm processing device 200 outputs a first kind of alarm to each area whose earthquake motion index exceeds a first threshold when it is determined that there are areas whose earthquake motion index exceeds the first threshold, outputs a second kind of alarm to each area whose earthquake motion index exceeds a second threshold when it is determined that there are areas whose earthquake motion index exceeds the second threshold lower than the first threshold, and then outputs a third kind of alarm to each area adjacent to the area whose earthquake motion index exceeds the first threshold, on the basis of adjacent area data stored in a storage part 202.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an earthquake warning system that measures the acceleration of an earthquake and uses an earthquake motion index calculated from the measured value.

  An earthquake warning system known as emergency earthquake warning (see Non-Patent Document 1) is currently used. In this earthquake warning system, the whole country is divided into a plurality of areas, and if an earthquake with a seismic intensity of less than 5 occurs in any area, an alarm is issued for all areas where a seismic intensity of 4 or more is expected. This is one of the purposes. In this earthquake warning system, the position (latitude, longitude, depth) and magnitude (magnitude) of an earthquake are estimated from seismic observation data, and the seismic intensity is predicted using a distance attenuation formula. Moreover, when the vertical acceleration of 100 gal or more is observed at the observation point, the seismic intensity at the point is estimated to be 5 or less (see Non-Patent Document 2).

http: // www. data. jma. go. jp / svd / eew / data / nc / http: // www. data. jma. go. jp / svd / eew / data / nc / katsuyou / reference. pdf (Technical reference material for overview and processing method of earthquake early warning)

  The success or failure of the earthquake warning system as described above depends on the accuracy of the hypocenter determination, and if the result of the hypocenter determination has a large error, the alarm is not properly issued. Furthermore, if two or more earthquakes occur simultaneously, the current method cannot be used. Moreover, the determination method which makes seismic intensity 5 or less when a vertical motion acceleration of 100 gal or more is observed includes a large error.

  Originally, although alarms should be made from a safer viewpoint, there is a problem that conventional earthquake alarm systems are not such. In order to solve the above-described problems, an object of the present invention is to provide a method and a system for issuing an earthquake warning using a seismic motion index calculated from an actually measured earthquake record without performing a hypocenter determination.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention divides the area to be alarmed into a plurality of areas, arranges one or more observation points in each area, and sets each observation point. A device that immediately estimates the earthquake motion index (earthquake motion index estimation device) is received, and the earthquake motion index (observation point earthquake motion index) at each observation point is received from the earthquake motion index estimation device, and the seismic motion index that represents each region (regional ground motion) A receiving unit that calculates an index), a storage unit that stores adjacent region data that stores a region adjacent to each region, data stored in the storage unit, and area earthquake motion calculated by the receiving unit An earthquake warning system comprising: a data processing unit that performs data processing based on an index; and an earthquake warning processing device that includes a distribution unit that issues an alarm according to a processing result of the data processing unit. If it is determined that there is a region of the earthquake motion index exceeding the first threshold, one type of alarm is issued in the region of the earthquake motion index exceeding the first threshold, and there is a region of the earthquake motion index exceeding the second threshold lower than the first threshold If it judges, it will issue 2 types of alarms to the area of the earthquake motion index exceeding the second threshold, and 3 types of alarms to the area adjacent to the area of the earthquake motion index exceeding the first threshold based on the adjacent area data stored in the storage unit. It is characterized by emitting.

  Further, the invention according to claim 2 includes an accelerometer that divides a region to be alarmed into a plurality of regions, arranges one or more observation points in each region, and detects acceleration at each observation point, In addition, a receiving unit that receives acceleration at each observation point from the accelerometer, and an approximate seismic motion index (observation point seismic motion index) at each observation point based on the acceleration received by the receiving unit, A seismic motion index estimating unit for calculating a seismic motion index representing each region (regional seismic motion index); a storage unit for storing adjacent region data for storing a region adjacent to each region; and storing in the storage unit Alarm processing including a data processing unit that performs data processing based on the generated data, a region earthquake motion index calculated by the earthquake motion index estimation unit, and a distribution unit that issues an alarm according to the processing result of the data processing unit In the seismic warning system comprising the device, when the earthquake warning processing device determines that there is a region of the ground motion index exceeding the first threshold value, the earthquake warning processing device issues a type 1 warning to the region of the ground motion index exceeding the first threshold value. If it is determined that there is an area of the earthquake motion index exceeding the low second threshold, two types of alarms are issued to the area of the earthquake motion index exceeding the second threshold, and the first threshold is set based on the adjacent area data stored in the storage unit. It is characterized in that three types of alarms are issued in the area adjacent to the area of the seismic motion index that exceeds.

  The invention according to claim 3 is the earthquake alarm system according to claim 1 or 2, wherein the earthquake alarm processing device issues an alarm when the third threshold value lower than the second threshold value falls below all regions. It is characterized by releasing.

  According to a fourth aspect of the present invention, in the earthquake warning system according to any one of the first to third aspects, the earthquake warning processing device determines that there is a region of an earthquake motion index exceeding a first threshold value. Then, it is determined whether or not there are other observation points that exceed the fourth threshold value that is lower than the first threshold value.

  The invention according to claim 5 is the earthquake alarm system according to any one of claims 1 to 4, wherein the earthquake alarm processing device is not necessarily adjacent to each area (wide area adjacent area). And having a storage unit for storing wide-area adjacent region data, and determining that there is a region of an earthquake motion index exceeding a fifth threshold that is higher than the first threshold, it is determined that an extremely strong earthquake has occurred, and the storage A four-type alarm is issued to a wide area adjacent to the area exceeding the fifth threshold stored in the section.

  The invention according to claim 6 is the earthquake alarm system according to any one of claims 1 to 4, wherein the earthquake alarm processing device is not necessarily adjacent to each area (wide area adjacent area). Having a storage unit for storing wide-area adjacent region data, and determining that the number of regions exceeding the sixth threshold exceeds a certain number, it is determined that a huge earthquake has occurred, and is stored in the storage unit. Five types of alarms are issued in a wide area adjacent to an area exceeding one threshold.

  The invention according to claim 7 is characterized in that, in the earthquake warning system according to any one of claims 1 to 6, a measured seismic intensity approximate value is used as an earthquake motion index.

  According to the earthquake warning system according to the present invention, it is possible to distribute the earthquake warning from the viewpoint of the safer side. Further, since the earthquake warning system according to the present invention does not depend on the determination of the epicenter, it can cope with the occurrence of two or more earthquakes or an earthquake having a wide seismic area.

It is a figure which shows the main structures of the earthquake warning system 300 which concerns on the 1st Embodiment of this invention. It is a figure explaining the concept of area division. It is a figure which shows the data structure of adjacent area data. It is a figure which shows the flowchart of the main process of the earthquake warning processing apparatus. It is a figure which shows the flowchart of the alarm switching process of the earthquake alarm processing apparatus. It is a figure which shows the flowchart of the alarm end determination process of the earthquake alarm processing apparatus. It is a figure which shows an example of the area | region of the alert delivery by the earthquake warning system 300 which concerns on this invention. It is a figure which shows the flowchart of the main process of the earthquake warning processing apparatus 200 in the earthquake warning system 300 which concerns on the 2nd Embodiment of this invention. It is a figure which shows the main structures of the earthquake warning system 300 which concerns on the 5th Embodiment of this invention.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a main configuration of an earthquake warning system 300 according to the first embodiment of the present invention. In the present invention, the seismic motion index may be any value such as SI value or maximum acceleration, but in this embodiment, the estimated seismic intensity is used. Therefore, a measurement seismic intensity estimation device is used as the earthquake motion index estimation device. In addition, since the seismic intensity (measured seismic intensity) determined by the Japan Meteorological Agency cannot be calculated in real time, there is no other way to use the estimated seismic intensity approximate value to realize an earthquake warning system for seismic intensity.

First, region division in the earthquake warning system 300 will be described. FIG. 2 is a diagram for explaining the concept of area division. In the earthquake warning system 300, taking Hokkaido as an example, for example, areas A ₁ , A ₂ , A ₃ , A ₄ , A ₅ , A ₆ , A ₇ ,... The area is divided so that at least one observation point is arranged. Here, when such a region is generalized, a region _An (n = 1 to N) can be obtained. That is, the earthquake warning system 300 divides the whole of Japan into N areas.

At least one observation point is provided in the area _An (n = 1 to N), and a measurement seismic intensity estimation device 1 is installed at each observation point as shown in FIG. The measured seismic intensity estimation device 1 calculates an approximate value of the measured seismic intensity and transmits it to the earthquake alarm processing device 200 installed in the center in real time via a communication network. In this way, the estimated seismic intensity estimated value at each observation point can be monitored immediately.

  Here, the measured seismic intensity estimation device 1 is an apparatus developed by the present inventors, and estimates the measured seismic intensity based on acceleration records observed by a strong seismometer (not shown). It is. As the measured seismic intensity estimation device 1, the one described in Japanese Patent No. 4229337 can be used.

  In addition, in this specification, about the specific structure regarding the measurement seismic intensity estimation apparatus 1, etc., it shall use with reference to all the matters as described in patent 4229337.

The earthquake alarm processing device 200 is an information processing device installed in a center (a plurality or one), and for example, a general-purpose server can be used. The earthquake alarm processing device 200 includes a receiving unit 201 that receives the estimated seismic intensity values (observation point seismic intensity) of each observation point, which are estimated by the measured seismic intensity estimation device 1. The receiving unit calculates an estimated value of the seismic intensity (regional seismic intensity) representing the area from the seismic intensity of the observation points belonging to the same area. For this, from the safety side, the maximum value of the observation point seismic intensity in the same area is used as the area seismic intensity, but if the number of observation points in the same area is sufficiently large, the average value or median value should be used. You can also.

In addition, the earthquake warning system 300 holds adjacent area data relating to which area is adjacent to which area. Such data is stored and held in the storage unit 202 of the earthquake alarm processing device 200. FIG. 3 shows the data structure of adjacent area data. Referring to FIG. 2, for example, the area A ₁ is adjacent to the area A ₂ and the area A ₄ , which is shown in FIG.
It is converted into data in the form

  In addition, the data processing unit 203 in the earthquake warning processing device 200 performs data processing based on the data stored in the storage unit 202 and the area seismic intensity calculated by the receiving unit 201, and if necessary, the distribution unit 204 It controls to deliver the alarm.

  In addition, the distribution unit 204 in the earthquake alarm processing device 200 distributes an earthquake alarm to an information terminal (such as a mobile phone, a smartphone, a personal computer, a television, or a radio) or a server.

  Next, processing of the earthquake alarm processing device 200 configured as described above will be described. FIG. 4 is a diagram showing a flowchart of main processing of the earthquake warning processing apparatus 200.

In the following flowchart,
The first threshold is a seismic intensity of 5 (measured seismic intensity approximate value 4.5),
The second threshold is seismic intensity 4 (estimated seismic intensity 3.5),
The third threshold is seismic intensity 1 (approximate seismic intensity 0.5).
The threshold value is not limited to the value shown here.

  In addition, it is assumed that the type 1 alarm has the highest alarm level, the type 2 alarm has the highest alarm level after the type 1 alarm, and the type 3 alarm has the highest alarm level after the type 2 alarm.

  In the earthquake warning system 300, when an earthquake that is expected to exceed the first threshold value occurs in any region, an object is to issue a warning to all regions that are expected to exceed the second threshold value.

  When the main process of the earthquake warning processing apparatus 200 is started in step S100, 1 is set to the variable n in the subsequent step S101.

In step S102, the maximum value of the measured seismic intensity estimates transmitted from the seismic intensity rounding unit 1 deployed to the observation point in a region A _n (observation point seismic intensity), seismic intensity estimate value representing the area A _n (area Seismic intensity).

  In step S103, it is determined whether n = N. If the determination in step S103 is no, n is incremented by 1 in step S110, and step S102 is looped again.

  On the other hand, if the determination in step S103 is YES, the process proceeds to step S104. In addition, it is preferable that the above loop (from n = 1 to n = N) is completed within about 1 second.

  Next, in step S104, it is determined whether or not there is a region that exceeds the first threshold (seismic intensity of less than 5) in any region. The determination step of step S104 is an alarm trigger determination step for determining whether to start an alarm for the earthquake alarm system 300 according to the present invention.

If the determination in step S104 is NO, returns again to step S101, it resumed loop to get the area seismic intensity of all the regions A _n. On the other hand, if the determination in step S104 is yes, the process proceeds to step S105 to start an alarm.

  In step S105, one type of alarm is issued for all areas exceeding the first threshold.

  Subsequently, in step S106, it is determined whether or not there is an area exceeding the second threshold (seismic intensity 4) in any area. If the determination in step S106 is NO, the process proceeds to step S108, and if YES, the process proceeds to step S107. In step S107, two types of alarms are displayed in the region where the first type alarm is not output in the region exceeding the second threshold. To emit.

  On the other hand, in step S108, by referring to the adjacent region data, all the regions adjacent to the region exceeding the first threshold value (seismic intensity of less than 5) are acquired, and in step S109, an alarm is output from the acquired regions. Three types of alarms are issued to areas that are not.

  In step S111, the process proceeds to an alarm switching process.

  Next, the alarm switching process will be described. FIG. 5 is a flowchart of the alarm switching process of the earthquake alarm processing apparatus 200.

  When the alarm switching process of the earthquake alarm processing device 200 is started in step S200, 1 is set to the variable n in the subsequent step S201.

In step S202, the maximum value of the measured seismic intensity estimates transmitted from the seismic intensity rounding unit 1 deployed to the observation point in a region A _n (observation point seismic intensity), seismic intensity estimate value representing the area A _n (area Seismic intensity).

  In step S203, it is determined whether n = N. If the determination in step S203 is no, n is incremented by 1 in step S210, and step S202 is looped again.

  On the other hand, if the determination in step S203 is yes, the process proceeds to step S204. In addition, it is preferable that the above loop (from n = 1 to n = N) is completed within about 1 second. In step S204, it is determined whether or not there is a region exceeding the first threshold value (seismic intensity of less than 5) in the region where the type 1 alarm has not been issued. If this determination is YES, the process proceeds to step S205, where it corresponds. Switch the area alarm to a one-type alarm or issue a new one-type alarm. On the other hand, if the determination in step S204 is no, the process proceeds to step S206.

In step S206, it is determined whether or not there is an area exceeding the second threshold value (seismic intensity 4) in the area where neither the type 1 alarm nor the type 2 alarm is issued. If this determination is YES, step S207 is performed. Proceed to, switch the alarm in the corresponding area to the two-type alarm, or issue a new two-type alarm. On the other hand, if the determination in step S206 is no, the process proceeds to step S208. In step S208, by referring to the adjacent area data, all areas adjacent to the area exceeding the first threshold (seismic intensity of less than 5) are acquired. In step S209, an alarm is issued among the acquired areas. Three types of alarms are issued in areas that do not exist.
In step S111, the process proceeds to an alarm end determination process.

  Next, the alarm end determination process will be described. FIG. 6 is a diagram illustrating a flowchart of the alarm end determination process of the earthquake alarm processing device 200.

  When the alarm switching process of the earthquake alarm processing apparatus 200 is started in step S300, 1 is set to the variable n in the subsequent step S301.

In step S302, the maximum value of the measured seismic intensity estimates transmitted from the seismic intensity rounding unit 1 deployed to the observation point in a region A _n (observation point seismic intensity), seismic intensity estimate value representing the area A _n (area Seismic intensity).

  In step S303, it is determined whether n = N. If the determination in step S303 is no, n is incremented by 1 in step S306, and step S302 is looped again.

  On the other hand, if the determination in step S303 is yes, the process proceeds to step S304. In addition, it is preferable that the above loop (from n = 1 to n = N) is completed within about 1 second.

  In step S304, it is determined whether or not all regions have fallen below the third threshold value (seismic intensity 1). If this determination is NO, the process proceeds to step S307, and again proceeds to the alarm switching process shown in FIG.

  On the other hand, if the determination in step S304 is YES, the process proceeds to step S305, cancels all alarms, proceeds to step S308, and again proceeds to the main process of the earthquake alarm processing apparatus shown in FIG.

  FIG. 7 illustrates the result of simulating the earthquake warning system 300 according to the present invention based on the measured seismic intensity estimated value data observed by the National Institute for Disaster Prevention Science and Technology during the 2008 Iwate-Miyagi Inland Earthquake. This is the alarm announcement situation when using the measured seismic intensity estimated value data up to 8:43:53. At this time, the earthquake early warning (alarm) has not been announced yet by the Japan Meteorological Agency, and it can be seen that the alarm is quickly delivered according to the earthquake alarm system 300 according to the present invention. In the area where the alarm is issued by the earthquake alarm system 300 according to the present invention, the seismic intensity of 4 or more is actually recorded. Thus, it can be seen that the earthquake warning system 300 according to the present invention can issue a warning faster than the current method without performing any hypocenter determination.

  As described above, according to the earthquake warning system 300 according to the present invention, it is possible to distribute the earthquake warning from the viewpoint of being on the safer side. Moreover, since the earthquake warning system 300 according to the present invention does not depend on the determination of the epicenter, it can cope with the occurrence of two or more earthquakes or an earthquake having a wide seismic area.

  Next, an earthquake warning system 300 according to the second embodiment of the present invention will be described. In this embodiment, it is assumed that there are a plurality of observation points in one area, and the measured seismic intensity estimation device 1 is provided at the plurality of observation points.

  In such a case, an alarm with higher certainty can be distributed. FIG. 8 is a diagram showing a flowchart of main processing of the earthquake warning processing device 200 in the earthquake warning system 300 according to the second embodiment.

  The process of FIG. 8 differs from the process of FIG. 4 in that step S112 is provided as a step that proceeds when step S104 is YES. In the second embodiment, step S104 and step S112 constitute an alarm trigger determination step for determining whether to start an alarm.

  In step S112, when it is determined that there is an area exceeding the first threshold (seismic intensity of 5), the observation exceeds a fourth threshold (for example, seismic intensity 3 (estimated seismic intensity 2.5)) that is lower than the first threshold. It is determined whether or not there are other points, and the determination in step S112 is YES, and the process proceeds to the step of distributing an alarm. If NO, the alarm is not distributed.

  According to such an embodiment, it is possible to avoid a false alarm due to noise or the like, although the time for issuing the alarm is delayed.

  Next, a third embodiment of the present invention will be described. In this embodiment, when the area seismic intensity exceeds the first threshold and reaches the fifth threshold (for example, seismic intensity 7 (estimated seismic intensity 6.5)), it is determined that an extremely strong earthquake has occurred. , Four types of alarms in a wide area adjacent area (for example, an adjacent area and an adjacent area of the adjacent area, etc., which are stored in the storage unit 202) exceeding the fifth threshold defined in advance. To emit. Also by such embodiment, the effect similar to embodiment described so far can be enjoyed. The four types of alarms are preferably set to the same alarm level as the one type alarms or the alarm level equal to or higher than the one type alarms.

  Next, a fourth embodiment of the present invention will be described. In the present embodiment, when the type 1 alarm is issued, if the number of areas exceeding the sixth threshold (for example, seismic intensity 4 (measured seismic intensity approximate value 3.5)) becomes a certain number or more, the wide area It is composed of a wide-area adjacent area (for example, an adjacent area and an adjacent area of the adjacent area, etc.) in which a predefined one-type alarm has been issued as a large earthquake that causes earthquake motion. 5 types of alarms are issued. Also by such embodiment, the effect similar to embodiment described so far can be enjoyed. The five types of alarms are preferably set to the same alarm level as the one type alarm or the alarm level equal to or higher than the one type alarm.

  Next, a fifth embodiment of the present invention will be described. FIG. 9 is a diagram showing a main configuration of an earthquake warning system 300 according to the fifth embodiment of the present invention.

  In the embodiment so far, the measurement seismic intensity estimation device 1 is provided at a plurality of observation points, and the measurement seismic intensity estimation device 1 transmits the measured seismic intensity estimation value to the earthquake alarm processing device 200. Then, an accelerometer 150 is installed at a plurality of observation points, the accelerometer 150 transmits acceleration data to the earthquake alarm processing device 200, and the measured seismic intensity estimation unit 205 in the earthquake alarm processing device 200 determines each of the acceleration data. The estimated seismic intensity at the observation point (observation point seismic intensity) is calculated. According to such an embodiment, in addition to the effects similar to those of the embodiments described so far, only the accelerometer 150 may be provided at a plurality of observation points, and there is an advantage that the system can be configured at a lower cost.

  In all the embodiments described above, if the observed point has a ground amplification level different from that of the surrounding area, and the observed estimated seismic intensity is always too large or too small, a correction value for the observed measured seismic intensity estimated value is used. In addition, the influence of ground amplification can be reduced.

  As described above, according to the earthquake warning system according to the present invention, it is possible to distribute the earthquake warning from the viewpoint of more safety. Further, since the earthquake warning system according to the present invention does not depend on the determination of the epicenter, it can cope with the occurrence of two or more earthquakes or an earthquake having a wide seismic area.

DESCRIPTION OF SYMBOLS 1 ... Measurement seismic intensity estimation apparatus 150 ... Accelerometer 200 ... Earthquake warning processing apparatus 201 ... Reception part 202 ... Storage part 203 ... Data processing part 204 ... Distribution part 205 ...・ Measurement seismic intensity estimation unit 300 ... Earthquake warning system

Claims (7)

The area to be alerted is divided into multiple areas, one or more observation points are arranged in each area, and each observation point is equipped with a device that immediately estimates the earthquake motion index (earthquake motion index estimation device), A receiving unit that receives a ground motion index (observation point ground motion index) at each observation point from the ground motion index estimation device and calculates a ground motion index (regional ground motion index) that represents each region, and is adjacent to each region A storage unit that stores adjacent region data that stores a region; data stored in the storage unit; a data processing unit that performs data processing based on a region earthquake motion index calculated by the reception unit; and a processing result of the data processing unit In an earthquake warning system consisting of an earthquake warning processing device having a distribution unit that issues an alarm according to
When the earthquake warning processing device determines that there is a region of the ground motion index exceeding the first threshold, the earthquake warning processing device issues a type 1 warning to the region of the ground motion index exceeding the first threshold, and the ground motion index exceeding the second threshold lower than the first threshold. If it is determined that there is a region, two types of alarms are issued to the region of the earthquake motion index exceeding the second threshold value, and the region of the earthquake motion index exceeding the first threshold value is adjacent based on the adjacent region data stored in the storage unit. An earthquake warning system characterized by issuing three types of warnings to the area. The area to be alarmed is divided into a plurality of areas, one or more observation points are arranged in each area, and an accelerometer that detects acceleration is provided at each observation point. Based on the acceleration received at the receiving unit that receives the acceleration and the earthquake motion index (observation point seismic motion index) at each observation point based on the acceleration received at the receiving unit, the seismic motion index that represents each region from the observation point seismic motion index (regional ground motion) An earthquake motion index estimation unit that calculates an index), a storage unit that stores adjacent area data that stores areas adjacent to each area, data stored in the storage unit, and an earthquake motion index estimation unit An earthquake warning system comprising a data processing unit that performs data processing based on the calculated area earthquake motion index and a distribution unit that issues a warning according to the processing result of the data processing unit Oite,
When the earthquake warning processing device determines that there is a region of the ground motion index exceeding the first threshold, the earthquake warning processing device issues a type 1 warning to the region of the ground motion index exceeding the first threshold, and the ground motion index exceeding the second threshold lower than the first threshold. If it is determined that there is a region, two types of alarms are issued to the region of the earthquake motion index exceeding the second threshold value, and the region of the earthquake motion index exceeding the first threshold value is adjacent based on the adjacent region data stored in the storage unit. An earthquake warning system characterized by issuing three types of warnings to the area. 3. The earthquake warning system according to claim 1, wherein the earthquake warning processing device cancels the warning when the third threshold value lower than the second threshold value falls below all of the regions. When the earthquake warning processing device determines that there is a region of the ground motion index exceeding the first threshold, it is determined whether there is another observation point exceeding the fourth threshold lower than the first threshold, and if not, an alarm is issued. The earthquake warning system according to any one of claims 1 to 3, wherein the earthquake warning system is not emitted. The earthquake warning processing device has a storage unit that stores wide adjacent region data that stores regions that are not necessarily adjacent to each region (wide adjacent region), and has an earthquake motion index that exceeds a fifth threshold that is higher than the first threshold. When it is determined that there is an area, it is determined that an extremely strong earthquake has occurred, and a four-type alarm is issued in a wide area adjacent to the area exceeding the fifth threshold stored in the storage unit. The earthquake warning system according to any one of claims 4 to 4. The earthquake warning processing device has a storage unit that stores wide adjacent area data that stores areas that are not necessarily adjacent to each area (wide adjacent areas), and determines that the number of areas exceeding the sixth threshold has reached a certain number or more. Then, it is determined that a huge earthquake has occurred, and a five-type alarm is issued in a wide area adjacent to the area exceeding the first threshold stored in the storage unit. The earthquake warning system according to claim 1. The earthquake alarm system according to any one of claims 1 to 6, wherein an approximate value of measured seismic intensity is used as an earthquake motion index.

Images