JP2014095586A - Earthquake identification apparatus, and earthquake identification system and earthquake identification method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake identification apparatus and an earthquake identification method that identify the scale of an earthquake quickly from ground movement data.SOLUTION: An earthquake identification apparatus includes a data reception unit 11 which receives information on an earthquake transmitted from seismographs 2 provided at respective observation points, and a control arithmetic unit 12 which computes data that the data reception unit 11 receives, and the control arithmetic unit 12 includes a data totaling unit 12a which totals the number of observation points for each preset lower-limit value of seismic intensity from the information that the data reception unit 11 receives, and an alarm determination unit 12b which determines whether a giant earthquake is detected from the number of observation points that the data totaling unit 12a totals.

Description

  The present invention relates to an earthquake identification device for identifying the magnitude of an earthquake from ground motion data, an earthquake identification system using the same, and an earthquake identification method.

  Conventionally, an apparatus that measures the acceleration of an earthquake and roughly estimates the seismic intensity has been disclosed (see Patent Document 1).

Japanese Patent No. 4229337

  With the technique described in Patent Document 1, it is possible to immediately estimate the seismic intensity of an earthquake, but it is not possible to identify whether the earthquake is a huge one.

  It is an object of the present invention to provide an earthquake identification device that quickly identifies the magnitude of an earthquake from ground motion data, an earthquake identification system using the earthquake identification system, and an earthquake identification method.

  An earthquake identification apparatus according to the present invention includes a data receiving unit that receives information on an earthquake transmitted from a seismometer arranged at each observation point, and a control calculation unit that calculates data received by the data receiving unit. The control calculation unit detects a huge earthquake from a data totaling unit that totals the number of observation points for each lower limit value of the seismic intensity set in advance from the information received by the data receiving unit, and the number of observation points totaled by the data totaling unit And an alarm judgment unit for judging whether or not it has been done.

  Further, in the earthquake identification device according to the present invention, the alarm determination unit outputs that the earthquake is a first-scale earthquake when the number of observation points observed over a predetermined seismic intensity within a predetermined time is equal to or greater than a first observation point threshold. It is characterized by that.

  Further, in the earthquake identification device according to the present invention, the alarm determination unit has a second scale when the number of observation points observed over a predetermined seismic intensity within a predetermined time is equal to or larger than a second observation point threshold greater than the first observation point threshold. It outputs that it is an earthquake.

  In the earthquake identification apparatus according to the present invention, the control calculation unit includes a magnitude estimation unit that estimates a magnitude by obtaining seismic source position information transmitted via a communication line.

In the earthquake identification apparatus according to the present invention, the magnitude estimation unit estimates the magnitude from the following equation (1).
M = α * log ₁₀ C + β * log ₁₀ Δshortest + γ (1)
However,
C is the number of observation points exceeding the preset seismic intensity,
Δ shortest is the shortest epicenter distance in the observation point,
α, β, and γ are constants obtained from past earthquake analysis results,
It is.

  In the earthquake identification device according to the present invention, the alarm determination unit outputs that the earthquake is a first-scale earthquake when the magnitude estimated by the magnitude estimation unit is greater than or equal to a first magnitude threshold.

  In the earthquake identification device according to the present invention, the alarm determination unit outputs a second-scale earthquake when the magnitude estimated by the magnitude estimation unit is greater than or equal to a second magnitude threshold greater than the first magnitude threshold. It is characterized by that.

  Furthermore, the earthquake identification system according to the present invention includes the earthquake identification device and a seismometer that transmits earthquake information to the earthquake identification device.

  In addition, the earthquake identification system according to the present invention includes an epicenter position information transmitting unit that transmits the epicenter position information to the earthquake identification device via a communication line.

  Furthermore, the earthquake identification method according to the present invention includes a step of receiving earthquake information from observation points within a predetermined time when an earthquake occurs, and a process of counting the number of observation points for each set lower limit value of seismic intensity from the earthquake information. And a step of determining whether or not a huge earthquake has been detected from the total number of observation points.

  In the earthquake identification method according to the present invention, the step of determining whether or not a huge earthquake has been detected from the total number of observation points is the first observation point threshold value that is set in advance by the number of points at which a predetermined seismic intensity is observed within a predetermined time. A step of determining whether or not the above is the case, and a step of outputting a first-scale earthquake when the number of points observed over a predetermined seismic intensity within a predetermined time is greater than or equal to the first observation point threshold value set in advance. Including.

  Further, in the earthquake identification method according to the present invention, the step of determining whether or not a huge earthquake has been detected from the total number of observation points is the first observation point where the number of points at which a predetermined seismic intensity is observed within a predetermined time is preset. A step of determining whether or not the second observation point threshold value is greater than or equal to a threshold value, and if the number of points observed over a predetermined seismic intensity within a predetermined time is equal to or greater than the preset second observation point threshold value, A step of outputting if there is.

  In addition, the earthquake identification method according to the present invention includes a step of estimating the magnitude by obtaining the epicenter position information transmitted via the communication line.

The earthquake identification method according to the present invention is characterized in that the step of estimating the magnitude estimates the magnitude from the following equation (1).
M = α * log ₁₀ C + β * log ₁₀ Δshortest + γ (1)
However,
C is the number of observation points exceeding the preset seismic intensity,
Δ shortest is the shortest epicenter distance in the observation point,
α, β, and γ are constants obtained from past earthquake analysis results,
It is.

  In the earthquake identification method according to the present invention, the step of estimating the magnitude includes a step of determining whether or not the estimated magnitude is equal to or greater than a preset first magnitude threshold value, and the estimated magnitude is set in advance. And a step of outputting that the earthquake is a first-scale earthquake when it is equal to or greater than the first magnitude threshold.

  In the earthquake identification method according to the present invention, the step of estimating the magnitude includes a step of determining whether or not the estimated magnitude is greater than or equal to a second magnitude threshold value that is greater than the first magnitude threshold value set in advance. And outputting a second-scale earthquake when the magnitude is equal to or greater than the preset second magnitude threshold.

  As described above, the earthquake identification apparatus according to the present invention includes a data receiving unit that receives information on an earthquake transmitted from a seismometer arranged at each observation point, and a control calculation unit that calculates data received by the data receiving unit. The control calculation unit includes a data totaling unit that totals the number of observation points for each lower limit value of seismic intensity set in advance from the information received by the data receiving unit, and a huge number of observation points totaled by the data totaling unit Since it has an alarm judgment unit for judging whether or not an earthquake has been detected, it is possible to quickly identify the magnitude of the earthquake from the ground motion data.

  Further, in the earthquake identification device according to the present invention, the alarm determination unit outputs that the earthquake is a first-scale earthquake when the number of observation points observed over a predetermined seismic intensity within a predetermined time is equal to or greater than a first observation point threshold. Therefore, it is possible to accurately identify the magnitude of the earthquake.

  Further, in the earthquake identification device according to the present invention, the alarm determination unit has a second scale when the number of observation points observed over a predetermined seismic intensity within a predetermined time is equal to or larger than a second observation point threshold greater than the first observation point threshold. It is possible to identify the magnitude of the earthquake more accurately.

  In the earthquake identification device according to the present invention, the control calculation unit includes a magnitude estimation unit that estimates the magnitude by obtaining the epicenter position information transmitted via the communication line, so that the magnitude can be quickly determined from the ground motion data. It is possible to estimate.

Moreover, in the earthquake identification apparatus according to the present invention, the magnitude estimation unit estimates the magnitude from the following equation (1), so that the magnitude can be accurately estimated.
M = α * log ₁₀ C + β * log ₁₀ Δshortest + γ (1)
However,
C is the number of observation points exceeding the preset seismic intensity,
Δ shortest is the shortest epicenter distance in the observation point,
α, β, and γ are constants obtained from past earthquake analysis results,
It is.

  In the earthquake identification device according to the present invention, the alarm judgment unit outputs that the magnitude estimated by the magnitude estimation unit is greater than or equal to a first magnitude threshold value, so that it is a first-scale earthquake. It becomes possible to identify accurately.

  In the earthquake identification device according to the present invention, the alarm determination unit outputs a second-scale earthquake when the magnitude estimated by the magnitude estimation unit is greater than or equal to a second magnitude threshold greater than the first magnitude threshold. Therefore, it becomes possible to more accurately identify the magnitude of the earthquake.

  Furthermore, since the earthquake identification system according to the present invention includes the earthquake identification device and a seismometer that transmits earthquake information to the earthquake identification device, it is possible to provide a system for accurately identifying the magnitude of an earthquake. It becomes.

  In addition, since the earthquake identification system according to the present invention includes an epicenter position information transmitting unit that transmits the epicenter position information to the earthquake identification device via a communication line, it is possible to estimate the magnitude and It is possible to provide a system for accurately identifying the scale.

  Furthermore, the earthquake identification method according to the present invention includes a step of receiving earthquake information from observation points within a predetermined time when an earthquake occurs, and a process of counting the number of observation points for each set lower limit value of seismic intensity from the earthquake information. And a step of judging whether or not a huge earthquake has been detected from the total number of observation points, it is possible to quickly identify the magnitude of the earthquake from the ground motion data.

  In the earthquake identification method according to the present invention, the step of determining whether or not a huge earthquake has been detected from the total number of observation points is the first observation point threshold value that is set in advance by the number of points at which a predetermined seismic intensity is observed within a predetermined time. A step of determining whether or not the above is the case, and a step of outputting a first-scale earthquake when the number of points observed over a predetermined seismic intensity within a predetermined time is greater than or equal to the first observation point threshold value set in advance. As a result, the magnitude of the earthquake can be accurately identified.

  Further, in the earthquake identification method according to the present invention, the step of determining whether or not a huge earthquake has been detected from the total number of observation points is the first observation point where the number of points at which a predetermined seismic intensity is observed within a predetermined time is preset. A step of determining whether or not the second observation point threshold value is greater than or equal to a threshold value, and if the number of points observed over a predetermined seismic intensity within a predetermined time is equal to or greater than the preset second observation point threshold value, And the step of outputting if there is, it becomes possible to more accurately identify the magnitude of the earthquake.

  In addition, since the earthquake identification method according to the present invention includes the step of estimating the magnitude by obtaining the epicenter position information transmitted via the communication line, it is possible to quickly estimate the magnitude from the ground motion data.

Further, in the earthquake identification method according to the present invention, the magnitude estimating step estimates the magnitude from the following equation (1), so that the magnitude can be accurately estimated.
M = α * log ₁₀ C + β * log ₁₀ Δshortest + γ (1)
However,
C is the number of observation points exceeding the preset seismic intensity,
Δ shortest is the shortest epicenter distance in the observation point,
α, β, and γ are constants obtained from past earthquake analysis results,
It is.

  In the earthquake identification method according to the present invention, the step of estimating the magnitude includes a step of determining whether or not the estimated magnitude is equal to or greater than a preset first magnitude threshold value, and the estimated magnitude is set in advance. If it is equal to or greater than the first magnitude threshold value, the step of outputting that the earthquake is of the first magnitude is included, so that the magnitude of the earthquake can be accurately identified.

  In the earthquake identification method according to the present invention, the step of estimating the magnitude includes a step of determining whether or not the estimated magnitude is greater than or equal to a second magnitude threshold value that is greater than the first magnitude threshold value set in advance. If the magnitude of the earthquake is equal to or greater than the second magnitude threshold value set in advance, the step of outputting that the earthquake is of the second magnitude is included, so that the magnitude of the earthquake can be more accurately identified.

It is a block diagram of the earthquake identification system 1 of 1st Embodiment concerning this invention. It is a figure which shows the flowchart of the earthquake identification method of 1st Embodiment concerning this invention. It is a figure which shows the observation point distribution of an analysis example. It is a figure which shows the epicenter distribution of the earthquake of an analysis example. It is a figure which shows the relationship between the lower limit of the seismic intensity which totaled the observation point of the analysis example, and the number of observation points. It is a figure which shows the relationship between the elapsed time from the earthquake occurrence time of an analysis example, and the number of observation points. It is a figure which shows the comparison with the prediction magnitude | size which used the regression equation with respect to the analysis example, and the magnitude | size announced by the Meteorological Agency. It is a figure which shows the flowchart of the earthquake identification method of 2nd Embodiment concerning this invention. It is a figure which shows the comparison with the prediction magnitude | size which used the regression equation with respect to the analysis example, and the magnitude | size announced by the Meteorological Agency.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of an earthquake identification system 1 according to a first embodiment of the present invention.

  The earthquake identification system 1 includes an earthquake identification device 10, a seismometer 2, a communication unit 3, a display unit 4, an alarm unit 5, a time calibration unit 6, and a power supply unit 7.

  The earthquake identification device 10 includes a data reception unit 11 that receives seismic intensity as earthquake information transmitted from the seismometer 2 arranged at each observation point, and a control calculation unit 12 that calculates data received by the data reception unit 11. Have.

  The seismometer 2 is installed at an observation point to be counted, calculates a measured seismic intensity, and transmits it to the data receiving unit 11. The measured seismic intensity can be calculated only after 1 minute or more of data has been obtained at each observation point, since it is basically calculated from a 1 minute strong motion record. Therefore, the seismometer 2 preferably calculates the measured seismic intensity using the real-time calculation method described in Patent Document 1.

  As described above, by calculating the measured seismic intensity using the real-time calculation method, it is possible to determine the earthquake identification in real time.

  The data receiving unit 11 receives the seismic intensity transmitted from the seismometer 2 through the communication line.

  The seismometer 2 may be configured to transmit a continuous waveform as earthquake information without calculating the measured seismic intensity. In this case, the measured seismic intensity may be calculated by the data receiving unit 11 or the control calculation unit 12 after receiving the continuous waveform from the seismometer 2.

  The control calculation unit 12 includes a data totaling unit 12a that totals data and an alarm determination unit 12b that determines whether to issue an alarm.

  The data totaling unit 12a totals the number of observation points for each lower limit value of the seismic intensity set in advance from the received seismic intensity. Further, the warning determination unit 12b determines whether a huge earthquake has been detected from the number of observation points counted by the data totaling unit 12a.

  The earthquake identification device 10 is connected to an NTP (Network Time Protocol) or the like, and inputs time information from the time calibration unit 6 that synchronizes to the correct time. In addition, the earthquake identification device 10 is supplied with power from a power supply unit 7 connected to a commercial power supply or the like.

  The earthquake identification device 10 transmits the data aggregated by the data aggregation unit 12a to the communication line via the communication unit 3. Further, the earthquake identification device 10 transmits the data aggregated by the data aggregation unit 12 a to the display device via the display unit 4. Furthermore, the earthquake identification device 10 outputs the result determined by the alarm determination unit 12 b to the contact output via the alarm unit 5.

  With such a configuration, it is possible to quickly identify the magnitude of the earthquake from the ground motion data.

  Next, the earthquake identification method of the earthquake identification system 1 of 1st Embodiment is demonstrated.

  FIG. 2 is a diagram showing a flowchart of the earthquake identification method according to the first embodiment of the present invention.

  First, in step 1, when an earthquake occurs, the data receiving unit 11 of the earthquake identification device 10 receives data greater than a preset seismic intensity value from the seismometer 2 at the observation point within a predetermined time (ST1).

  FIG. 3 is a diagram showing the observation point distribution of the analysis example.

  As shown in FIG. 3, in this analysis case, the observation points were the observation points excluding the islands out of the initial observation points where K-NET was established in 1996. Observation points are approximately 20 km apart. Note that the observation point is not limited to K-NET, and other observation points may be used. It is also possible to combine observation points from different systems.

  Subsequently, in step 2, the data totaling unit 12a totalizes the number of observation points for each set lower limit value of the seismic intensity (ST2).

  FIG. 4 is a diagram showing the epicenter distribution of the earthquake of the analysis example. FIG. 5 is a diagram showing the relationship between the lower limit value of seismic intensity and the number of observation points where the observation points of the analysis examples are tabulated.

  As shown in Fig. 4, in this analysis case, the measured seismic intensity is calculated from the seismic data obtained at the observation point in the past, and the epicenter distance to the observation point closest to the epicenter is within 300km with magnitude 6.5 or more. The epicenter location of the 55 earthquakes was determined. In addition, as shown in FIG. 5, the relationship between the lower limit of seismic intensity and the number of observation points was obtained by collecting the observation points of the analysis examples.

  As can be seen from FIG. 5, the 2011 Tohoku-Pacific Ocean Earthquake (M9.0) has a large number of observation points that are prominent compared to other earthquakes at any seismic intensity lower limit. Note that the number of observation points on the vertical axis is indicated by a logarithm.

  Next, in step 3, it is determined whether or not the number of points observed over a predetermined seismic intensity within a predetermined time is greater than or equal to a preset first observation point threshold (ST3).

  In step 3, if the number of points observed over a predetermined seismic intensity within a predetermined time is greater than or equal to a preset first observation point threshold value, the first observation in which the number of points observed over a predetermined seismic intensity within a predetermined time is set in step 4 It is determined whether or not the second observation point threshold value is greater than the point threshold value (ST4).

  FIG. 6 is a diagram showing the relationship between the elapsed time from the earthquake occurrence time in the analysis example and the number of observation points.

  The graph shown in FIG. 6 is a result of calculating real-time seismic intensity using data of the 2011 off the Pacific coast of Tohoku Earthquake and totaling the number of observation points with seismic intensity of 5 or less. It exceeded 50 observation points 93 seconds after the earthquake, and exceeded 100 observation points 154 seconds later.

  Therefore, in this analysis example, the predetermined seismic intensity was a real-time measured seismic intensity of 4.5 (seismic intensity of 5 or less), the first observation point threshold was 50 observation points, and the second observation point threshold was 100 observation points. An earthquake with a measured seismic intensity of 4.5 (with a seismic intensity of less than 5) of about 50 observation points was judged to be a huge earthquake as a first-scale earthquake equivalent to the 2003 Tokachi-oki earthquake class (M8). The earthquake of about 100 observation points is judged to be a super-large earthquake as a second-scale earthquake equivalent to the 2011 Tohoku-Pacific Ocean Earthquake class (M9).

  Therefore, in step 4, when the number of points observed over a predetermined seismic intensity within a predetermined time is equal to or greater than a preset second observation point threshold value, in step 5, the alarm determination unit 12b outputs detection information of a huge earthquake ( ST5), and in step 4, if the number of points observed over a predetermined seismic intensity within a predetermined time is not equal to or greater than a preset second observation point threshold, in step 6, the alarm determination unit 12b outputs detection information of a huge earthquake (ST6). In Step 3, when the number of observation points equal to or greater than the predetermined seismic intensity is not equal to or greater than the preset first observation point threshold, in Step 7, the alarm determination unit 12b outputs normal earthquake detection information (ST7).

  Thus, according to the earthquake identification method of the earthquake identification system 1 of the first embodiment, it is possible to quickly identify the magnitude of the earthquake from the ground motion data.

  In the first embodiment, the magnitude of the earthquake is judged in three stages based on the first observation point threshold and the second observation point threshold. However, the magnitude of the earthquake is judged in two stages based only on the first observation point threshold. Alternatively, the magnitude of the earthquake may be determined by dividing it into a plurality of stages of three or more stages with more thresholds.

  Next, a second embodiment of the present invention will be described.

  FIG. 2 is a block diagram of the earthquake identification system 1 according to the second embodiment of the present invention.

  In the earthquake identification system 1 of the second embodiment, the epicenter location information transmission unit 8 connected to the earthquake identification device 10 via a communication line, the magnitude estimation unit 12c included in the control calculation unit 12 of the earthquake identification device 10, Is provided. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  The magnitude estimation unit 12c estimates the magnitude by obtaining earthquake location information such as an emergency earthquake bulletin transmitted from the earthquake location information transmission unit 8 via a communication line.

The magnitude is estimated from the following equation (1).
M = α * log ₁₀ C + β * log ₁₀ Δshortest + γ (1)
However,
C is the number of observation points exceeding the preset seismic intensity,
Δ shortest is the shortest epicenter distance in the observation point,
α, β, and γ are constants obtained from past earthquake analysis results,
It is.

  FIG. 8 is a diagram showing a flowchart of the earthquake identification method according to the second embodiment of the present invention.

  First, in step 11, as in step 1, when an earthquake occurs, the data receiving unit 11 of the earthquake identification device 10 receives data greater than a preset seismic intensity value from the seismometer 2 at the observation point within a predetermined time. (ST11).

  Subsequently, in step 12, as in step 2, the data tabulation unit 12a tabulates the number of observation points for each set lower limit value of the seismic intensity (ST12).

  Next, in step 13, the earthquake identification device 10 acquires the epicenter position information from the epicenter position information transmission unit 8 (ST13).

  Next, in step 14, the earthquake identification apparatus 10 estimates the magnitude by the magnitude estimation unit 12c (ST14).

  Next, in step 15, it is determined whether or not the estimated magnitude is a preset first magnitude threshold, for example, M8 or more (ST15).

  If the estimated magnitude is greater than or equal to the preset first magnitude threshold in step 15, it is determined in step 16 whether or not the estimated magnitude is greater than or equal to a preset second magnitude threshold, for example, M8.5 (ST16).

  If the estimated magnitude is greater than or equal to the second magnitude threshold that is greater than the first magnitude threshold set in advance in step 16, the warning determination unit 12 b outputs detection information of a super-large earthquake as a second-scale earthquake in step 17. If the estimated magnitude is not greater than or equal to the preset second magnitude threshold value in step 16, the warning determination unit 12b outputs detection information of a huge earthquake as the first-scale earthquake in step 18 (ST18). ). If the estimated magnitude is not greater than or equal to the preset first magnitude threshold in step 15, the alarm determination unit 12b outputs normal earthquake detection information in step 19 (ST19).

  Next, a case where analysis is performed by the earthquake identification system of the second embodiment will be described.

  FIG. 9 is a diagram showing a comparison between a predicted magnitude using a regression equation for an analysis example and a magnitude announced by the Japan Meteorological Agency.

In this analysis example, the magnitude estimation equation is set as shown in the following equation (2) for an earthquake (153 earthquake) with a seismic intensity of 5 or less observed at the observation point shown in FIG.
M = 1.187 * log ₁₀ C ₅ slightly + 0.906 * log ₁₀ Δshortest +4.310 (2)

The horizontal axis in FIG. 9 is the predicted magnitude M according to Equation (2), and the vertical axis is the magnitude M _J announced by the Japan Meteorological Agency. The RMS (Root Mean Square) error was about 0.47 in the predicted magnitude M and the magnitude M _J announced by the Japan Meteorological Agency. This value is accurate enough to identify in real time whether or not it is a huge earthquake.

  As described above, according to the earthquake identification method of the earthquake identification system 1 of the second embodiment, it is possible to quickly identify the magnitude and the magnitude of the earthquake from the ground motion data.

  In the first embodiment, the magnitude is estimated in three stages based on the first magnitude threshold and the second magnitude threshold. However, the magnitude may be estimated in two stages only based on the first magnitude threshold. The magnitude may be estimated by being divided into a plurality of stages of three or more stages with many threshold values.

  The earthquake identification device 10 according to the present embodiment includes a data receiving unit 11 that receives earthquake information transmitted from the seismometer 2 arranged at each observation point, and a control calculation unit that calculates data received by the data receiving unit 11. The control calculation unit 12 includes a data totaling unit 12a that totals the number of observation points for each lower limit value of the seismic intensity set in advance from the information received by the data receiving unit 11, and the number of observation points totaled by the data totaling unit 12a Therefore, it is possible to quickly identify the magnitude of the earthquake from the ground motion data.

  Further, in the earthquake identification device 10 of the present embodiment, the alarm determination unit 12b outputs a large earthquake when the number of observation points observed over a predetermined seismic intensity within a predetermined time is equal to or greater than the first observation point threshold. It is possible to accurately identify the scale of the.

  Further, in the earthquake identification device 10 of the present embodiment, the alarm determination unit 12b is configured to detect a huge earthquake when the number of observation points observed over a predetermined seismic intensity within a predetermined time is equal to or greater than a second observation point threshold greater than the first observation point threshold. Because it outputs, it becomes possible to identify the magnitude of the earthquake more accurately.

  Moreover, in the earthquake identification apparatus 10 of this embodiment, since the control calculating part 12 has the magnitude estimation part 12c which estimates a magnitude | size by obtaining the epicenter position information transmitted via a communication line, it can be quickly determined from ground motion data. Magnitude can be estimated.

Moreover, in the earthquake identification apparatus 10 of this embodiment, the magnitude estimation part 12c estimates a magnitude from the following formula | equation (1), Therefore It becomes possible to estimate a magnitude exactly.
M = α * log ₁₀ C + β * log ₁₀ Δshortest + γ (1)
However,
C is the number of observation points exceeding the preset seismic intensity,
Δ shortest is the shortest epicenter distance in the observation point,
α, β, and γ are constants obtained from past earthquake analysis results,
It is.

  Further, in the earthquake identification device 10 of the present embodiment, the alarm determination unit 12b outputs a huge earthquake when the magnitude estimated by the magnitude estimation unit 12c is equal to or greater than the first magnitude threshold, so the scale of the earthquake is accurately determined. It becomes possible to identify.

  Further, in the earthquake identification device 10 of the present embodiment, the alarm determination unit 12b outputs that the earthquake is a huge earthquake when the magnitude estimated by the magnitude estimation unit 12c is greater than or equal to the second magnitude threshold greater than the first magnitude threshold. It becomes possible to more accurately identify the magnitude of the earthquake.

  Furthermore, since the earthquake identification system 1 of the present embodiment includes the earthquake identification device 10 and the seismometer 2 that transmits earthquake information to the earthquake identification device 10, a system for accurately identifying the magnitude of the earthquake is provided. Is possible.

  Moreover, since the earthquake identification system 1 of this embodiment is provided with the epicenter position information transmission part 8 which transmits epicenter position information to the earthquake identification apparatus 10 via a communication line, it becomes possible to estimate a magnitude, It becomes possible to provide a system for accurately identifying the magnitude of an earthquake.

  Furthermore, the earthquake identification method of the present embodiment includes a step of receiving earthquake information from observation points within a predetermined time when an earthquake occurs, and the number of observation points is counted for each set lower limit of seismic intensity from the earthquake information. Since there is a step and a step of determining whether or not a huge earthquake has been detected from the total number of observation points, it is possible to quickly identify the magnitude of the earthquake from the ground motion data.

  Further, in the earthquake identification method of the present embodiment, the step of determining whether or not a huge earthquake has been detected from the total number of observation points is the first observation point threshold value that is set in advance by the number of points observed over a predetermined seismic intensity within a predetermined time. And a step of outputting a large earthquake when the number of points observed over a predetermined seismic intensity within a predetermined time is equal to or greater than a preset first observation point threshold value. It is possible to accurately identify the scale of the.

  Further, in the earthquake identification method of the present embodiment, the step of determining whether or not a huge earthquake has been detected from the total number of observation points is the first observation point threshold value that is set in advance by the number of points observed over a predetermined seismic intensity within a predetermined time. A step of determining whether or not the threshold value is larger than the second observation point threshold value, and if the number of observations exceeding the predetermined seismic intensity within the predetermined time is equal to or more than the preset second observation point threshold value, it is output that the earthquake is a huge earthquake. Process, the magnitude of the earthquake can be more accurately identified.

  Moreover, since the earthquake identification method of this embodiment has the process of estimating a magnitude | size by acquiring the epicenter location information transmitted via a communication line, it becomes possible to estimate a magnitude rapidly from ground motion data.

Further, in the earthquake identification method of the present embodiment, the magnitude estimating step estimates the magnitude from the following equation (1), so that the magnitude can be accurately estimated.
M = α * log ₁₀ C + β * log ₁₀ Δshortest + γ (1)
However,
C is the number of observation points exceeding the preset seismic intensity,
Δ shortest is the shortest epicenter distance in the observation point,
α, β, and γ are constants obtained from past earthquake analysis results,
It is.

  In the earthquake identification method of the present embodiment, the step of estimating the magnitude includes a step of determining whether or not the estimated magnitude is equal to or greater than a first magnitude threshold set in advance, and a first magnitude threshold set in advance. In the case of the above, since it includes the step of outputting that it is a huge earthquake, it is possible to accurately identify the magnitude of the earthquake.

  In the earthquake identification method of the present embodiment, the step of estimating the magnitude includes the step of determining whether the estimated magnitude is greater than or equal to a second magnitude threshold value that is greater than a preset first magnitude threshold value, and the estimated magnitude is previously set. If it is equal to or greater than the set second magnitude threshold value, it includes a step of outputting that it is a super-large earthquake, so that the magnitude of the earthquake can be more accurately identified.

  In addition, this invention is not limited by this embodiment. That is, in the description of the embodiments, many specific details are included for illustration, but those skilled in the art can add various variations and modifications to these details without departing from the scope of the present invention. It will be understood that this is not exceeded. Accordingly, the exemplary embodiments of the present invention have been described without loss of generality or limitation to the claimed invention.

DESCRIPTION OF SYMBOLS 1 ... Earthquake identification system 2 ... Seismograph 3 ... Communication part 4 ... Display part 5 ... Alarm part 6 ... Time calibration part 7 ... Power supply part 10 ... Earthquake identification apparatus 11 ... Data receiving part 12 ... Control calculating part 12a ... Data totaling part 12b ... Alarm judgment part

Claims (16)

A data receiving unit for receiving earthquake information transmitted from seismometers arranged at each observation point;
A control calculation unit for calculating data received by the data receiving unit;
With
The control calculation unit is
A data totaling unit for totaling the number of observation points for each lower limit value of seismic intensity set in advance from the information received by the data receiving unit;
An alarm determination unit for determining whether a huge earthquake has been detected from the number of observation points counted by the data aggregation unit;
An earthquake identification device characterized by comprising: The said warning judgment part outputs that it is a 1st magnitude | size earthquake, when the said number of observation points which observed more than the predetermined seismic intensity within the predetermined time is more than a 1st observation point threshold value. Earthquake identification device. The alarm determination unit outputs a second-scale earthquake when the number of observation points observed over a predetermined seismic intensity within a predetermined time is greater than or equal to a second observation point threshold value greater than the first observation point threshold value. The earthquake identification device according to claim 2. The earthquake identification according to any one of claims 1 to 3, wherein the control calculation unit includes a magnitude estimation unit that estimates a magnitude by obtaining seismic source position information transmitted via a communication line. apparatus. 5. The earthquake identification device according to claim 4, wherein the magnitude estimation unit estimates a magnitude from the following equation (1).
M = α * log ₁₀ C + β * log ₁₀ Δshortest + γ (1)
However,
C is the number of observation points exceeding the preset seismic intensity,
Δ shortest is the shortest epicenter distance in the observation point,
α, β, and γ are constants obtained from past earthquake analysis results,
It is. 6. The earthquake identification device according to claim 4, wherein when the magnitude estimated by the magnitude estimation unit is greater than or equal to a first magnitude threshold, the warning determination unit outputs that the earthquake is of the first scale. The said warning judgment part outputs that it is a 2nd magnitude | size earthquake, when the magnitude estimated by the said magnitude estimation part is more than the 2nd magnitude threshold value larger than a 1st magnitude threshold value. Earthquake identification device. The earthquake identification device according to any one of claims 1 to 7,
A seismometer that transmits earthquake information to the earthquake identification device;
An earthquake identification system comprising: An epicenter location information transmission unit for transmitting epicenter location information via a communication line to the earthquake identification device;
The earthquake identification system according to claim 8, comprising: Receiving earthquake information from an observation point within a predetermined time when an earthquake occurs;
From the earthquake information, the process of counting the number of observation points for each set lower limit of seismic intensity,
A process of determining whether a huge earthquake has been detected from the total number of observation points;
An earthquake identification method. The process of determining whether a huge earthquake has been detected from the total number of observation points is as follows:
Determining whether or not the number of points observed over a predetermined seismic intensity within a predetermined time is greater than or equal to a preset first observation point threshold;
A step of outputting a first-scale earthquake when the number of points observed over a predetermined seismic intensity within a predetermined time is greater than or equal to the preset first observation point threshold;
The earthquake identification method according to claim 10, comprising: The process of determining whether a huge earthquake has been detected from the total number of observation points is as follows:
Determining whether the number of points observed over a predetermined seismic intensity within a predetermined time is greater than or equal to a second observation point threshold greater than the preset first observation point threshold;
A step of outputting a second-scale earthquake when the number of points observed over a predetermined seismic intensity within a predetermined time is greater than or equal to the preset second observation point threshold;
The earthquake identification method according to claim 11, comprising: The earthquake identification method according to any one of claims 10 to 12, further comprising a step of estimating a magnitude by obtaining seismic source position information transmitted through a communication line. 14. The earthquake identification method according to claim 13, wherein the step of estimating the magnitude estimates the magnitude from the following equation (1).
M = α * log ₁₀ C + β * log ₁₀ Δshortest + γ (1)
However,
C is the number of observation points exceeding the preset seismic intensity,
Δ shortest is the shortest epicenter distance in the observation point,
α, β, and γ are constants obtained from past earthquake analysis results,
It is. The step of estimating the magnitude includes
Determining whether the estimated magnitude is greater than or equal to a preset first magnitude threshold;
When the estimated magnitude is greater than or equal to the preset first magnitude threshold first magnitude threshold, outputting a first scale earthquake;
The earthquake identification method according to claim 13 or 14, comprising: The step of estimating the magnitude includes
Determining whether the estimated magnitude is greater than or equal to a second magnitude threshold greater than the first magnitude threshold first magnitude threshold set in advance;
When the estimated magnitude is greater than or equal to the preset second magnitude threshold, outputting a second-scale earthquake;
The earthquake identification method according to claim 15, comprising:

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