JP2010276383A - Emergency earthquake warning receiving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an emergency earthquake warning receiving apparatus for receiving an emergency earthquake warning which can easily evaluate the correctness of information on the estimated arrival time of a shock. <P>SOLUTION: The emergency earthquake warning receiving apparatus 6 is equipped with: a calculation unit 22 for calculating the estimated arrival time of a shock at the installation point of the apparatus on the basis of an emergency earthquake warning; an acceleration sensor 11 for measuring the magnitude of a shock of an earthquake every unit time; a first storage unit 13 for storing data on the magnitude of a shock for every time unit measured by the acceleration sensor together with time; a data management unit 23 for extracting data in the vicinity of the estimated arrival time of a shock predicted by the calculation unit 22; and a second storage unit for storing the extracted data and the information indicating the estimated arrival time in association with each other. This allows an error between the actual occurrence time of a shock and the estimated arrival time of a shock to be detected easily and allows the correctness of information on the estimated arrival time of a shock to be evaluated easily. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an earthquake early warning receiver. More specifically, the present invention relates to an earthquake early warning receiving device that receives an earthquake early warning.

  When an earthquake occurs, a small vertical wave (P wave) and a large horizontal wave (S wave) are generated simultaneously. Of these, the P wave propagates faster than the S wave. Therefore, using such a phenomenon, immediately after the occurrence of the earthquake, the values of the earthquake occurrence time, the epicenter, the magnitude, etc. are obtained from the data obtained by observing the P wave with a seismometer installed near the epicenter. Based on the estimated value and the obtained value, the arrival time and seismic intensity of the S wave in each place are predicted, so that the data of emergency earthquake bulletin is transmitted (see Patent Document 1, etc.).

Patent Document 1 has a function of receiving emergency earthquake warning data, and even if the emergency earthquake warning is not in time, an earthquake warning is generated based on the P wave data observed by the internal seismometer. In order to output, an earthquake early warning receiving system including an information receiving apparatus having an internal seismometer is described.
In the earthquake early warning reception system, the magnitude of the shaking estimated from the earthquake early warning is compared with the magnitude of the shaking measured by the internal seismometer provided in the information receiving device, so that the ground It is configured to correct the amplification characteristics of shaking caused by buildings.

JP 2008-96203 A

When the initial information set in advance for the information receiving device is different from the actual installation location of the information receiving device, there is an error between the actual occurrence time of the shake and the estimated arrival time of the shake. May occur.
However, in the information receiving device of the earthquake early warning receiving system, since the data of the shake measured per unit time by the internal seismometer is not stored, the actual occurrence time of the shake and the estimated arrival time of the shake are calculated. It is difficult to compare.

  The present invention has been made in view of such circumstances, and provides an emergency earthquake warning receiving device for receiving an earthquake early warning that can easily evaluate the accuracy of information related to the estimated arrival time of shaking. The purpose is to do.

The emergency earthquake bulletin receiving device of the present invention is an emergency earthquake bulletin receiving device for receiving an emergency earthquake bulletin including information for calculating an estimated arrival time of shaking due to an earthquake,
Based on the earthquake early warning, a calculation unit that calculates the estimated arrival time of the shake at the installation site of the earthquake early warning receiver,
An acceleration sensor that measures the magnitude of shaking due to an earthquake per unit time;
A first storage unit having a storage area for storing, with time, data on the magnitude of shaking per unit time measured by the acceleration sensor;
A data management unit that extracts data in the vicinity of the estimated arrival time of shaking calculated by the calculation unit from the data stored in the first storage unit;
A second storage unit that stores the extracted data and the information indicating the estimated arrival time in association with each other is provided.

According to the earthquake early warning receiving apparatus of the present invention, it is possible to store the data of the magnitude of the shaking measured every unit time by the acceleration sensor in association with the information indicating the estimated arrival time. Therefore, according to the earthquake early warning receiving device of the present invention, it is possible to easily extract the data of the actual shaking magnitude within a predetermined time in the vicinity of the estimated arrival time from the shaking magnitude data. Therefore, the error between the actual occurrence time of the shake and the estimated arrival time of the shake can be easily detected.
This makes it possible to evaluate the accuracy of information related to the estimated arrival time of shaking.
In the present invention, the first storage unit and the second storage unit may be different storage devices, or may be provided in the same storage device (hard disk, memory, etc.). When provided in the same storage device, the first storage unit and the second storage unit may be allocated and provided in different areas of the same storage device.

In the present invention, the determination unit that evaluates the accuracy of the estimated arrival time of the shake by comparing the time when the shake due to the earthquake is detected by the acceleration sensor and the estimated arrival time of the shake,
It is preferable to further include an output unit that outputs a warning signal to the outside when the accuracy evaluated by the determination unit is lower than a preset accuracy.

  According to the earthquake early warning receiving device configured as described above, based on the time when the shake due to the earthquake is detected by the acceleration sensor (actual shake occurrence time) and the estimated arrival time of the shake calculated by the calculation unit. Thus, the accuracy of the estimated arrival time of the shake can be determined by detecting an error between the actual occurrence time of the shake and the estimated arrival time of the shake. When the accuracy determined by the determination unit is lower than a preset accuracy, a warning signal is output to the outside.

  Therefore, according to such an earthquake early warning receiving device, in addition to the above-described effects, the accuracy of the estimated arrival time of the shake can be easily known. In addition, depending on whether the accuracy is good or not, it is possible to easily know, for example, whether or not it is necessary to correct the initial information regarding the installation location of the earthquake early warning receiver. Therefore, according to the earthquake early warning receiving device, the initial information can be easily checked, and as a result, the accuracy of information related to the estimated arrival time of the shake can be improved.

The present invention further includes a ring buffer management unit that manages the data of the magnitude of the vibration measured by the acceleration sensor for each time series and stores the data in a ring buffer.
The storage area of the first storage unit is divided into a plurality of divided storage areas to which sequentially increasing addresses are assigned, and the next address after the last address of the plurality of divided storage areas is set as a head address. Forming a ring buffer,
According to the order of the addresses assigned to the plurality of divided storage areas, the data of the magnitude of shaking measured by the acceleration sensor is allocated and stored in the plurality of divided storage areas in chronological order. Is preferred.

  According to such an earthquake early warning receiving device, in addition to the above-described effects, the capacity of the storage area in the first storage unit can be reduced. Further, according to the earthquake early warning receiving device, the data of the magnitude of the shake measured by the acceleration sensor is assigned in time series in accordance with the order of the addresses, so that access to desired data is facilitated. It becomes easy to extract data before and after the estimated arrival time of the shake from the data stored in the storage area of one storage unit.

  According to the earthquake early warning receiving device of the present invention, it is possible to easily evaluate the accuracy of information related to the estimated arrival time of shaking.

It is a block diagram which shows the structure of the delivery system of emergency earthquake early warning. It is a block diagram which shows the structure of the earthquake early warning receiver which concerns on one embodiment of this invention. It is a block diagram which shows the structure of the control part of the earthquake early warning receiver which concerns on one embodiment of this invention. It is a block diagram which shows the ring buffer in the 1st memory | storage part of the earthquake early warning receiver which concerns on one embodiment of this invention. It is a schematic explanatory drawing which shows the format of the shake data in the 1st memory | storage part of the earthquake early warning receiver which concerns on one embodiment of this invention. It is a schematic explanatory drawing which shows the structure of the data delivered as an earthquake early warning. It is a schematic explanatory drawing which shows the structure of the data preserve | saved at the 1st memory | storage part of the earthquake early warning receiver which concerns on one embodiment of this invention. It is a schematic explanatory drawing which shows the structure of the data output by the calculating part of the earthquake early warning receiver which concerns on one embodiment of this invention. It is a schematic explanatory drawing which shows the structure of the data preserve | saved at the 2nd memory | storage part of the earthquake early warning receiver which concerns on one embodiment of this invention.

[Configuration of distribution system]
Hereinafter, an emergency earthquake bulletin distribution system including an emergency earthquake bulletin receiving device according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing the configuration of a distribution system for emergency earthquake warnings. In FIG. 1, a system using “emergency earthquake bulletin” transmitted by the Japan Meteorological Agency will be described as an example. However, in the present invention, emergency earthquake information created by other organizations in place of the earthquake early warning of the Japan Meteorological Agency. May be used.

  The distribution system 1 shown in FIG. 1 includes a computer 2 of the Japan Meteorological Agency, first and second distribution servers 3 and 5, and earthquake early warning receivers (terminals) 4 and 6.

  Computer 2 is a computer that creates and transmits emergency earthquake warning A based on initial tremor data captured at observation points (seismic meters) close to the epicenter among observation points (seismometers) arranged in various places. It is. The computer 2 is connected to seismometers arranged in various places via a frame relay network or the like. Since the server 2 is configured to collect data observed by the seismometer, for example, the initial tremor (vibration caused by the P wave) captured by the seismometer close to the epicenter is analyzed and the earthquake is instantaneously generated. Occurrence time, location of the epicenter, magnitude (magnitude) of the earthquake, etc. can be specified.

  The first distribution server 3 is a server that branches and distributes the received earthquake early warning A to further downstream users (terminal 4 and second distribution server 5). The first distribution server 3 is connected to the computer 2 via a dedicated line.

  Downstream of the first distribution server 3, a terminal 4 and a second distribution server 5 used by a primary user are connected via a dedicated line such as a digital line or a communication line such as a private communication network such as an IP-VPN. Has been.

  The terminal 4 is an earthquake early warning receiving device that receives the earthquake early warning A branched and distributed from the first distribution server 3. In this terminal 4, based on the earthquake early warning A directly received from the first distribution server 3 and the data related to the place where the terminal 4 is installed, the estimated arrival time of the shake and the magnitude of the shake (seismic intensity) ) Etc. are predicted. Thereby, for example, the estimated arrival time and the seismic intensity of the main motion (vibration due to S waves) to the point where the terminal 4 is installed are estimated, and before the main motion that causes the earthquake damage arrives, this information Can be notified.

  The second distribution server 5 is a secondary distribution server that receives the earthquake early warning A branched and distributed from the first distribution server 3 and distributes it to downstream users. The second distribution server 5 is connected to a terminal 6 used by a secondary user via a CATV line, an Internet line, or the like.

  According to the second distribution server 5, the earthquake early warning A distributed from the first distribution server 3 can be further branched and distributed. Therefore, when the earthquake early warning A is distributed to more users. Even if it exists, the load to the 1st delivery server 3 can be reduced.

  The terminal 6 is an earthquake early warning receiving device that receives the earthquake early warning A branched and distributed from the second distribution server 5. In this terminal 6, based on the earthquake early warning A received from the second distribution server 5 and the data relating to the place where the terminal 6 is installed, the estimated arrival time of the shake and the magnitude of the shake (seismic intensity) Etc. are predicted. As a result, as in the case of the terminal 4, it is possible to notify the estimated arrival time of the main motion and the seismic intensity information to the point where the terminal 6 is installed before the main motion causing the earthquake damage arrives. It becomes.

[Earthquake early warning receiver configuration]
Next, an emergency earthquake bulletin receiving device for earthquake early warning according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 2 is a block diagram showing the configuration of the earthquake early warning receiving device for the earthquake early warning according to one embodiment of the present invention. In FIG. 2, the terminal 6 used by the secondary user will be described as an example of the earthquake early warning receiver (terminal) in FIG. 1, but the present invention is a terminal used by the primary user. 4 can also be applied.

  The terminal 6 shown in FIG. 2 includes an acceleration sensor 11, a control unit 12, a first storage unit 13, a communication unit 14, a second storage unit 15, a determination unit 16, and an output unit 17. ing.

  The acceleration sensor 11 measures the magnitude of shaking caused by an earthquake. The acceleration sensor 11 measures the magnitude of shaking at the installation point of the terminal 6 over time. Therefore, according to the acceleration sensor 11, it is possible to obtain the data of the magnitude of shaking for each unit time at the installation point of the terminal 6. The data of the magnitude of shaking per unit time is output to the control unit 12 and processed, thereby being associated with the time when the magnitude of shaking is measured. The details of the processing of the data of the magnitude of fluctuation per unit time in the control unit 12 will be described later.

  The first storage unit 13 stores data relating to the magnitude of shaking by the acceleration sensor 11 processed by the control unit 12, initial information data relating to the installation location of the terminal 6, and the like. In the first storage unit 13, data related to the magnitude of shaking by the acceleration sensor 11 is stored in association with the time when the magnitude of shaking is measured. The data stored in the first storage unit 13 is managed by the control unit 12 so as to be input / output.

  The communication unit 14 receives the earthquake early warning A that is branched and distributed via the communication line from the second distribution server 5 (see FIG. 1). This communication part 14 should just have the function to receive the data regarding the earthquake early warning A as data according to the kind of communication line.

  Data related to the earthquake early warning A received by the communication unit 14 is processed by the control unit 12 and used for calculating the estimated arrival time of shaking at the installation location of the terminal 6.

  The second storage unit 15 stores the data generated by the control unit 12 based on the data related to the earthquake early warning A received by the communication unit 14 and the data stored in the first storage unit 13. Yes. The data stored in the second storage unit 15 is managed by the control unit 12 so as to be input / output.

  The determination unit 16 evaluates the accuracy of the estimated arrival time of the shake by comparing the estimated arrival time of the shake at the installation location of the terminal 6 with the actual occurrence time of the shake at the installation location of the terminal 6. .

In this determination unit 16, based on the data related to the estimated arrival time of the shake at the installation location of the terminal 6 calculated by the control unit 12 and the data stored in the second storage unit 15 and output via the control unit 12. Thus, an error between the estimated arrival time of the shake at the installation point of the terminal 6 and the actual occurrence time of the shake at the installation point of the terminal 6 is detected, and the accuracy of the accuracy is evaluated based on the error. Is done.
The determination by the determination unit 16 is output via the output unit 17.

[Configuration of control unit and processing by control unit]
Next, the configuration of the control unit 12 will be described, and the processing performed by the control unit 12 will be described.
FIG. 3 is a block diagram showing a configuration of a control unit of the emergency earthquake warning receiving device according to the embodiment of the present invention.

  The control unit 12 manages the data of the magnitude of the shake measured by the acceleration sensor 11 in time series and stores it in the ring buffer, and the emergency earthquake warning A received by the communication unit 14. A calculation unit 22 that processes data, and a data management unit 23 that manages data stored in the first storage unit 13 and data stored in the second storage unit 15 so as to be input / output are provided.

First, the processing of the magnitude data measured by the acceleration sensor 11 will be described.
In the control unit 12, when the vibration magnitude data measured per unit time by the acceleration sensor 11 is input to the ring buffer management unit 21, the ring buffer management unit 21 receives the data and the magnitude of the shake. The time when the length is measured is associated. Thereafter, the associated data is output to the first storage unit 13.

  In the storage area of the first storage unit 13, as shown in FIG. 4, a divided storage area is formed, which is divided into N + 1 pieces and assigned with addresses (index numbers: 0 to N) that are gradually increased. Has been. In the divided storage area, the address (index number: N + 1) next to the last address (index number: N) is handled as the head address (index number: 0). Therefore, a ring buffer as a ring-shaped storage area is formed in the storage area of the first storage unit 13.

  Therefore, the data measured over time by the acceleration sensor 11 every unit time and output to the first storage unit 13 through the processing in the control unit 12 is stored in the first storage unit 13 as shown in FIG. According to the order of the addresses assigned to the respective divided storage areas, the divided storage areas are allocated and stored in the time series order.

  For example, the ring buffer shown in FIG. 5A is composed of 20 divided storage areas to which addresses of index numbers: 0 to 19 are sequentially assigned. In this ring buffer, the shake data 11 measured most recently is stored in the divided storage area to which the address of index number: 3 is attached. In addition, the shaking data 12 to 27 measured after the shaking data 11 are sequentially stored in the respective divided storage areas to which the addresses from the index number: 3 to the last address, the index number: 19, are attached. . Further, the shaking data 28 after the shaking data 27 is stored in the divided storage area 0 of the index number: 0 which is the first address, and the shaking data 29 and 30 thereafter are index numbers: 1 which are the subsequent addresses. , 2 are stored in each divided storage area.

  On the other hand, when further shake data is obtained after the shake data 30, the divided storage area in which the newest shake data 30 among the shake data stored in the ring buffer is stored [arrow A in FIG. ] Are sequentially stored in the divided storage area immediately after [see FIG. 5B].

  By storing the shaking data in the ring buffer in this way, the amount of data stored in the first storage unit 13 can be reduced to a necessary minimum amount, and the capacity of the storage area can be saved.

Next, processing by the control unit 12 when the earthquake early warning A is received by the communication unit 14 of the terminal 6 will be described.
When the communication unit 14 receives the earthquake early warning A, the earthquake early warning A is sent to the calculation unit 22 of the control unit 12. Specifically, as shown in FIG. 6, for example, as shown in FIG. 6, the earthquake early warning A includes a unique seismic identification symbol given for each earthquake, a seismic source latitude and a seismic longitude, an earthquake magnitude, and an earthquake. It consists of data such as detection time (actual shaking occurrence time). The calculation unit 22 extracts data (for example, epicenter latitude, epicenter longitude, magnitude, etc.) necessary to calculate the estimated arrival time of shaking at the installation location of the terminal 6 from these data.

  At the same time, the calculation unit 22 acquires data of initial information regarding the installation location of the terminal 6 stored in the first storage unit 13 via the data management unit 23. Specifically, for example, as shown in FIG. 7, the initial information data includes a terminal identification number unique to the terminal 6, the latitude and longitude of the installation location of the terminal 6, and the ground at the installation location of the terminal 6. It consists of data such as the ground amplification factor indicating the degree of earthquake amplification. In the calculation unit 22, data (for example, the latitude and longitude of the installation point, the ground amplification factor, etc.) necessary for calculating the estimated arrival time of the shake from the data, for example, is obtained via the data management unit 23. To be acquired.

  Thereafter, the calculation unit 22 calculates the estimated arrival time of the shake at the installation location of the terminal 6, the magnitude of the shake, and the like. In this way, the calculation unit 22 generates data such as the target earthquake identification symbol specific to the target earthquake as shown in FIG. 8, the predicted seismic intensity at the installation location of the terminal 6, and the estimated arrival time of the shake. Is done.

  Further, the data management unit 23 is based on the data indicating the magnitude of the actual shake stored in the first storage unit 13 based on the estimated arrival time of the shake among the data generated by the calculation unit 22. Data in the vicinity of the estimated arrival time is extracted, and the extracted data is associated with information indicating the estimated arrival time. Thereafter, the data associated with the data management unit 23 is stored in the second storage unit 15 by the data management unit 23. Here, as the data in the vicinity of the estimated arrival time, for example, the shaking data from the arrival time of the earthquake early warning to the shaking convergence time at the installation location of the terminal 6 (terminal installation location) (in FIG. 9, the shaking data 36 to shaking data 93).

  As described above, the second storage unit 15 stores the data associated with the information indicating the estimated arrival time among the data indicating the actual magnitude of the shake, so that the actual data at the installation location of the terminal 6 is stored. It is easy to detect an error between the earthquake detection time, which is the occurrence time of the sway, and the estimated arrival time.

[Processing by judgment unit]
Next, a process for evaluating the accuracy of the estimated arrival time of the shake in the determination unit 16 will be described. The determination unit 16 performs a process of evaluating the accuracy based on the data stored in the second storage unit 15 (see FIG. 9).

  FIG. 9 is a schematic explanatory diagram illustrating the configuration of data stored in the second storage unit 15. In FIG. 9, the shaking data in “stored data” indicates data of measurement results of the magnitude of shaking measured over time every second in order.

  In the determination unit 16, first, data stored in the second storage unit 15 is acquired via the data management unit 23 of the control unit 12. Based on the acquired data, the estimated arrival time of the swing and the actual swing are obtained. An error with respect to the occurrence time is calculated.

  Then, the determination unit 16 determines whether the accuracy of the estimated arrival time of the shake is good or bad according to the magnitude of the error. Thereafter, when the determined accuracy is lower than the preset accuracy, the determination unit 16 outputs a signal prompting the output unit 17 to output a warning signal.

  If the estimated seismic intensity predicted from the earthquake early warning A and the actual seismic intensity are approximately the same, the error may be calculated as the latitude and / or longitude in the initial information regarding the installation location of the emergency earthquake early warning receiver and the actual installation. It is assumed that this is due to the difference between the latitude and / or longitude of the point. Therefore, in this case, the correction of the initial information can be prompted based on the accuracy determination result by the determination unit 16.

  4, 6: Earthquake early warning receiver (terminal), 11: acceleration sensor, 13: first storage unit, 15: second storage unit, 16: determination unit, 17: output unit, 21: ring buffer management unit, 22 : Calculation unit, 23: data management unit

Claims (3)

An earthquake early warning receiving device for receiving an earthquake early warning including information for calculating an estimated arrival time of an earthquake shake,
Based on the earthquake early warning, a calculation unit that calculates the estimated arrival time of the shake at the installation site of the earthquake early warning receiver,
An acceleration sensor that measures the magnitude of shaking due to an earthquake per unit time;
A first storage unit having a storage area for storing, with time, data on the magnitude of shaking per unit time measured by the acceleration sensor;
A data management unit that extracts data in the vicinity of the estimated arrival time of shaking calculated by the calculation unit from the data stored in the first storage unit;
An earthquake early warning receiving device, comprising: a second storage unit that stores extracted data and information indicating the estimated arrival time in association with each other. A determination unit that evaluates the accuracy of the estimated arrival time of the shake by comparing the time when the shake due to the earthquake is detected by the acceleration sensor and the estimated arrival time of the shake,
The emergency earthquake warning reception device according to claim 1, further comprising: an output unit that outputs a warning signal to the outside when the accuracy evaluated by the determination unit is lower than a preset accuracy. Further comprising a ring buffer management unit for managing the data of the magnitude of shaking measured by the acceleration sensor for each time series and storing it in a ring buffer,
The storage area of the first storage unit is divided into a plurality of divided storage areas to which sequentially increasing addresses are assigned, and the next address after the last address of the plurality of divided storage areas is set as a head address. Forming a ring buffer,
According to the order of the addresses given to the plurality of divided storage areas, the data of the magnitude of shaking measured by the acceleration sensor is allocated and stored in the plurality of divided storage areas in time series order. Item 3. The earthquake early warning receiver according to item 1 or 2.

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