JP2011051664A - System and method for long-period earthquake motion watch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long-period earthquake motion watch system capable of relatively precisely estimating the arrival of long-period earthquake motion by a low-cost simple system configuration. <P>SOLUTION: The long-period earthquake motion watch system includes a communication section 130 receiving earthquake preliminary data; a threshold value table 120 making a predetermined area associated with a threshold magnitude serving as a threshold for performing watch operation; and a processing section 110. The processing section acquires an epicenter location area that is an area including the epicenter of an earthquake, and a magnitude from the earthquake preliminary data received by the communication section 130. The processing section acquires the threshold magnitude corresponding to the epicenter location area by referring to the threshold value table 120. The processing section compares the magnitude acquired from the earthquake preliminary data and the threshold magnitude, and instructs to perform watch operation when the acquired magnitude is larger than the threshold magnitude. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention predicts the arrival of long-period ground motion provided in a target building such as a high-rise building that is a structure having a long natural vibration period, and instructs to perform a warning operation when the arrival of long-period ground motion is predicted. The long-period ground motion warning system and the long-period ground motion warning method used for predicting the arrival of long-period ground motion are related.

  Structures with long natural vibration periods, such as high-rise buildings and long-span bridges, may shake greatly due to long-period ground motions (long-period ground motions) caused by large-scale earthquakes that occurred far away. In the Tokyo metropolitan area, some high-rise buildings shook violently in the 2000 Tottori-ken Seibu Earthquake (Tokyo Otemachi's seismic intensity 0), which is more than 500 km away, and the 2003 Tokachi-oki earthquake (Tokyo Otemachi's seismic intensity 2) Damage has been reported in many earthquakes, including confinement damage.

Based on these cases, multiple methods have been devised for elevator management that detect the arrival of long-period ground motion and prevent damage to the elevator. For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-297178), an earthquake monitoring control apparatus that protects elevators installed in buildings from seismic waves generated at long distance points is scattered across a wide area. Seismic wave information collecting means for collecting seismic wave information observed at a plurality of seismic observation points, individual analysis processing means for frequency analysis of seismic wave information collected at each seismic observation point collected by the seismic wave information collecting means, and a plurality of earthquakes Long-period ground motion prediction means for predicting long-period ground motion from the frequency analysis results at the observation point, means for predicting the presence or absence of the elevator of the building to be managed from the predicted direction of movement of the long-period ground motion, and There is disclosed an earthquake monitoring and control device comprising control command notification means for notifying a predicted building elevator control device of an operation control command. That.
JP 2007-297178 A

  By the way, in the conventional technology, a configuration for collecting seismic wave information observed at a plurality of seismic observation points, a frequency analysis by Fourier transform as an earthquake analysis processing unit, or a long cycle by Rayleigh waves or Love waves There is a problem that a system such as an arithmetic processing unit used for earthquake motion prediction is required, and the system is complicated and expensive. In particular, a plurality of seismic sensors (seismic meters) for detecting long-period ground motions are required, which increases the cost of the system.

On the other hand, in order to simplify the system configuration for predicting long-period ground motion, a method using an emergency earthquake bulletin distributed by the Japan Meteorological Agency may be considered. However, this earthquake early warning is intended for ground shaking, and the public earthquake early warning issues a warning when the predicted seismic intensity is less than 5. For this reason, there was a problem that the seismic intensity was small and it was not effective for long-period ground motions that greatly shake high-rise buildings. In addition, if an alarm is issued based on such an earthquake early warning, the threshold value for the alarm will be lowered, and the alarm will be issued frequently even in earthquakes that do not include long-period ground motion, which is not accurate and practical. There was also a problem.

The present invention solves the above-described problem, and the invention according to claim 1 associates a communication unit that receives earthquake early warning data, a predetermined area, and a threshold magnitude that is a threshold for performing a warning action. And a threshold location table to be stored, and an earthquake source location region that is an area including an earthquake source from the earthquake early warning data received by the communication unit, and a magnitude are obtained, and the threshold location table is referred to correspond to the earthquake source location region. An arithmetic processing unit that acquires a threshold magnitude, compares the magnitude acquired from the earthquake early warning data with the threshold magnitude, and instructs to perform a warning operation when the acquired magnitude is larger than the threshold magnitude, Long-period ground motion warning system.

  According to a second aspect of the present invention, there is provided a communication unit that receives earthquake early warning data, a threshold value table that stores a predetermined area and a threshold magnitude that is a threshold value for performing a warning action in association with each other, and is received by the communication unit. The source location area, the magnitude, and the depth of the hypocenter are obtained from the earthquake early warning data, and the threshold magnitude corresponding to the source location area and the source depth is obtained by referring to the threshold table. A long cycle characterized by having an arithmetic processing unit that compares the magnitude acquired from the earthquake early warning data with a threshold magnitude, and commands a warning action when the acquired magnitude is greater than the threshold magnitude It is an earthquake motion warning system.

  According to a third aspect of the present invention, in the long-period earthquake motion warning system according to the first or second aspect, the warning operation is lighting a warning light or sounding a warning sound.

  According to a fourth aspect of the present invention, in the long-period earthquake motion warning system according to any one of the first to third aspects, the warning operation is control of an elevator.

  The invention according to claim 5 includes a step of preparing a threshold value table for storing a predetermined area and a threshold magnitude as a threshold value for performing a warning operation, a step of receiving earthquake early warning data, and a step of receiving A step of obtaining a source location area and a magnitude that are regions including an earthquake source from earthquake early warning data, a step of obtaining a threshold magnitude corresponding to the source location area by referring to the threshold table, and an earthquake early warning data And a step of instructing to perform a warning action when the acquired magnitude is larger than the threshold magnitude, and a magnitude of the long-period earthquake motion warning method.

  The invention according to claim 6 includes a step of preparing a threshold value table that stores a predetermined area and a threshold magnitude that is a threshold value for performing a warning operation in association with each other, a step of receiving earthquake early warning data, and a step of receiving A step of obtaining a source location region, a magnitude, and a depth of the hypocenter from the earthquake early warning data, and a threshold value corresponding to the source location region and the source depth by referring to the threshold table. A step comprising: obtaining a magnitude; and comparing the magnitude obtained from the earthquake early warning data with a threshold magnitude and instructing to perform a warning action when the obtained magnitude is greater than the threshold magnitude. This is a periodic earthquake motion warning method.

  The invention according to claim 7 is the long-period earthquake motion warning method according to claim 5 or claim 6, wherein in the step of preparing the threshold value table, the observation target building shows the observation result of the long-period earthquake. Corrections are made based on both the ground motion response characteristics of the ground in the area where the site is located and the natural vibration period of the alerting target building, and preparation is performed by obtaining a threshold magnitude that is a threshold for performing the alert operation.

According to the long-period ground motion warning system and the long-period ground motion warning method according to the present invention, it is possible to predict the arrival of long-period ground motion with relatively high accuracy by a simple system configuration that does not cost. Further, according to the long-period ground motion warning system according to the present invention, it is possible to appropriately issue a warning operation command based on the predicted arrival of long-period ground motion, and it is possible to reduce damage such as elevator confinement. .

It is a figure which shows an example of the block configuration which implement | achieves the long period earthquake motion warning system 100 which concerns on embodiment of this invention. It is a figure which shows an example of the area division for creating the threshold value table. It is a figure which shows an example of the threshold value table 120 used with the long period earthquake motion warning system 100 which concerns on embodiment of this invention. It is a figure which shows an example of the processing flow of the long period earthquake motion warning system 100 which concerns on embodiment of this invention. It is the figure which showed exaggeratedly the earthquake motion response characteristic spectrum in A district and B district in the metropolitan area. In A district and B district, it summarizes the necessity of vigilance according to the height and magnitude of the building. It is a figure which shows an example of the threshold value table 120 used with the long-period earthquake motion warning system 100 which concerns on other embodiment of this invention. It is a figure which shows an example of the processing flow of the long period earthquake motion warning system 100 which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of a block configuration for realizing a long-period earthquake motion warning system 100 according to an embodiment of the present invention. The long-period ground motion warning system 100 according to the present embodiment is suitable for warning of damage caused by long-period ground motion in a building having a long natural vibration period represented by a high-rise building. However, the buildings to which the long-period ground motion warning system 100 according to the present invention can be applied are not limited to this, but can also be applied to structures that are easily affected by long-period ground motions such as long bridges and oil storage facilities. In FIG. 1, 110 is an arithmetic processing unit, 120 is a threshold value table, 130 is a communication unit, 140 is an alarm unit, 150 is an elevator control unit, and 160 is an apparatus control unit.

  The arithmetic processing unit 110 is a CPU or the like that executes arithmetic processing, and acquires data received by the communication unit 130 by executing a program stored and held in a storage unit (not shown) or stores it in the threshold table 120. The stored data can be acquired, or instructions can be given to the configuration of the alarm unit 140, the elevator control unit 150, the device control unit 160, and the like.

  The threshold table 120 is a data table that is referred to by the arithmetic processing unit 110, and stores a threshold magnitude that is a threshold for determining whether or not to perform a warning operation. This threshold magnitude differs depending on where the earthquake occurred. More specifically, a predetermined area is divided, and if there is an earthquake with a magnitude greater than that for each divided area, it will shake to the extent that warning is required in the building to be warned. Create and prepare the table in advance. The creation of such a threshold table 120 will be described in more detail with reference to FIGS.

FIG. 2 is a diagram showing an example of area division for creating the threshold table 120, and FIG. 3 is a diagram showing an example of the threshold table 120 used in the long-period earthquake motion warning system 100 according to the present embodiment. In this example, it is assumed that the building that is the object of alerting by the long-period earthquake motion alerting system 100 according to the present embodiment is in the Tokyo metropolitan area. Then, when guarding the buildings in such a metropolitan area, for example, the area is divided into areas 1 to 12, and the magnitude of the earthquake that occurred in each area is larger than that. Judgment is made on whether or not long-period ground motion that requires vigilance will come. Such a magnitude is a threshold magnitude, and threshold magnitudes M _{1 to} M ₁₂ are set for the respective areas _{1 to 12} as shown in FIG. In the long-period ground motion warning system 100 according to the present embodiment, for example, for an earthquake whose region 4 is an epicenter, M ₄ is referred to as the threshold magnitude, and the magnitude of the earthquake is greater than M _4. Judge that there is a possibility of long-period ground motion.

  In the example of area division shown in FIG. 2, the threshold table 120 is divided into 12 areas in order to create the threshold table 120, but it is of course possible to perform finer area division for such area division. is there. In performing such area division, it is important to set the area so that the difference based on the location in the same area does not increase.

  The communication unit 130 receives earthquake early warning data and inputs the earthquake early warning data to the arithmetic processing unit 110. The earthquake early warning data received by the communication unit 130 may be any data including the data relating to the location of the epicenter and the data relating to the magnitude of the earthquake, but most commonly distributed by the Japan Meteorological Agency. The data included in the earthquake early warnings that are available can be used.

  The alarm unit 140, the elevator control unit 150, and the device control unit 160 are destinations to which the arithmetic processing unit 110 sends instructions so as to be alert. In the present embodiment, these three are shown, but any one or any two may be used.

  The alarm unit 140 may be a warning light that visually warns, an alarm that alerts audibly, broadcast in a building in a target building, or the like. When it is determined that there is a characteristic, it operates according to a command from the arithmetic processing unit 110.

  In addition, the elevator control unit 150 controls an elevator (not shown) installed in the building to be warned, and when the long-period ground motion warning system 100 determines that there is a possibility that long-period ground motion will arrive. In addition, in accordance with a command from the arithmetic processing unit 110, safety stop control is performed such as stopping the elevator car on the nearest floor and opening the door.

  In addition, the device control unit 160 controls a precision device (not shown) that is installed in a warning target building and is vulnerable to long-period ground motion. The long-period ground motion warning system 100 may cause long-period ground motion. When it is determined that there is an error, the precision device is stopped by a command from the arithmetic processing unit 110, thereby ensuring the safety of the precision device and preventing damage.

  Next, processing of the long-period earthquake motion warning system 100 according to the present embodiment configured as described above will be described. FIG. 4 is a diagram illustrating an example of a processing flow of the long-period earthquake motion warning system 100 according to the embodiment of the present invention.

  In FIG. 4, when the processing of the long-period earthquake motion warning system 100 is started in step S100, it is determined in the subsequent step S101 whether or not the earthquake warning data has been acquired by the communication unit 130. If an earthquake occurs in any region, the determination in step S101 is YES, and the process proceeds to step S102.

In step S102, the earthquake early warning data received by the communication unit 130, acquires the epicenter location area is a region including the hypocenter of an earthquake (n), and a magnitude M ₀ earthquake. In step S103, the threshold table 120 is referred to, and the threshold magnitude _Mn is acquired.

In step S104, compares the magnitude M ₀ and the threshold magnitude M _n obtained from earthquake early data, whether or not magnitude M ₀ obtained larger than the threshold value magnitude M _n, i.e., whether the M _0> M _n It is determined whether or not. When the determination result in step S104 is YES, the process proceeds to step S105, and the arithmetic processing unit 110 issues a command to warn the alarm unit 140, the elevator control unit 150, the device control unit 160, and the like. .

  As described above, in the periodic earthquake motion warning system 100 according to the present invention, it is only necessary to construct a system that receives earthquake early warning data and makes a determination based on the data, and a sensor that detects the arrival of long-period ground motion. Therefore, according to the periodic earthquake motion warning system 100 according to the present invention, it is possible to predict the arrival of long-period ground motion with relatively high accuracy by a simple system configuration that is not costly.

  Further, in the long-period earthquake motion warning system 100 according to the present invention, it is only necessary to prepare the arithmetic processing unit 110 that processes an algorithm to the extent that the comparison determination is performed with reference to the table, and the long-period earthquake motion warning system 100 according to the present invention. According to the above, a warning operation command can be issued quickly by a simple arithmetic process.

  Further, according to the long-period ground motion warning system 100 according to the present invention, it is possible to appropriately issue a warning operation command based on the predicted arrival of long-period ground motion, and to reduce damage such as confinement of an elevator. Become.

  Next, a supplementary explanation regarding creation / preparation of the threshold value table 120 will be provided. In order to create the threshold table 120, it is necessary to predict long-period ground motion for each magnitude (and a combination of the focal depths) for each focal region. As a method for this, a method using a regression formula based on past data, a method by theoretical calculation, a method of superimposing observation records of small earthquakes or predicted ground motion, etc. can be used. A method of using the observation results of long-period ground motion that includes the characteristics of the target point and the propagation path of the ground motion between them will be explained.

  When creating the threshold value table 120, when using observation results of long-period ground motion, such observation results are obtained in a certain area (fixed point) within the metropolitan area. However, even in the same metropolitan area, this observation result cannot be applied as it is in an area 10 km away from the area. This is because the ground motion response characteristics of the ground differ depending on the area. The seismic motion response characteristics will be described with reference to FIG. FIG. 5 is an exaggerated view of the seismic response characteristics spectrum in the A and B districts within the Tokyo metropolitan area.

In FIG. 5, the solid line shows the ground motion response characteristic spectrum of the ground in the A area, and the dotted line shows the ground motion response characteristic spectrum of the ground in the B area. In each spectrum, the lower line shows the ground motion response spectrum when magnitudes are M _1, upper line shows the ground motion response spectrum when magnitudes is M ₁ greater than M ₂ Yes. As shown in Fig. 5, even in two districts within the same metropolitan area, it depends on the ground structure of the district what kind of vibration cycle the response is high or low. I understand. Moreover, it turns out that responsiveness will become high if a magnitude goes up in any area.

  For example, assuming that the observation results of long-period earthquakes are those acquired in the A district in the Tokyo metropolitan area, in order to apply the observation results to the B district, the correction according to the above-mentioned ground motion response characteristic spectrum Must be done.

Moreover, even if the buildings are located in the same district, the natural vibration period varies depending on the number of floors and the structure type, so the degree of influence varies depending on the vibration period of the earthquake motion. In the figure, as an example, the natural frequency T ₃₀ of a 30-story building (here, assumed to be 3 sec) and the natural frequency T ₅₀ of a 50-story building (here, assumed to be 5 sec) are shown. Has been. In addition, for example, the level that requires caution is assumed to be the line L in the figure, and caution is required when the spectrum is above L, and caution is not required when the spectrum is below.

Then, when the magnitude is M _1, it has a big impact on the 30-story building located in the A district, and it is necessary to be cautious. It also affects the 50-story building located in the A district. It is clear that there is no need for vigilance. Thus, the threshold value table 120 must be created after correction based on the natural vibration period of the alert target building.

FIG. 6 summarizes the necessity of vigilance according to the height and magnitude of buildings in the A and B districts. For example, in the case of the building C _B50 in the B district, it is shown that no warning is required when the magnitude is M ₁ and that warning is required when the magnitude is M ₂ .

Next, another embodiment of the present invention will be described. In the previous embodiment, from the earthquake early warning data received by the communication unit 130, the epicenter location region (n), which is the region including the epicenter of the earthquake, and the earthquake magnitude M ₀ are obtained, and thereby the threshold magnitude is obtained. However, in the present embodiment, in addition to these two pieces of information, information related to the depth d of the epicenter is also obtained from the earthquake early warning data, and the threshold magnitude is obtained from the three pieces of information, The arrival of long-period ground motion is predicted with higher accuracy. Hereinafter, another embodiment of the present invention will be described with reference to the drawings. However, since the same system configuration as that of FIG. 1 can be used, detailed description thereof will be omitted. Also in the present embodiment, an example of area division for creating the threshold value table 120 is the same as in FIG.

  In this embodiment, since the data configuration of the threshold table 120 is different from that of the previous embodiment, the data configuration of the threshold table 120 of this embodiment will be described. FIG. 7 is a diagram showing an example of the threshold value table 120 used in the long-period earthquake motion warning system 100 according to another embodiment of the present invention.

Also in the present embodiment, it is assumed that the buildings that are subject to alert by the long-period earthquake motion alert system 100 are in the Tokyo metropolitan area. Then, when guarding a building in such a metropolitan area, for example, the area is divided into areas 1 to 12, and the depth of the earthquake in each area is related to the earthquake. Perform level division. Set the threshold magnitude at each region and the depth of the epicenter, and whether the earthquake that occurred is larger than this threshold magnitude and whether long-period ground motions that require the vigilance of the building will occur. Judgment. In the present embodiment, the depth level, D ₁ when focal depth is 0 to D _1, D ₂ when focal depth is d ₁ to d _2, focal depth d ₂ Although three stages of D ₃ are set when ˜, the number of stages can be arbitrarily set.

As such threshold magnitudes, as shown in FIG. 7, threshold magnitudes M _{1,1 to} M _12,3 are respectively set for the respective areas 1 to 12 and the focal depth level. In the long-period earthquake motion warning system 100 according to the present embodiment, for example, the threshold magnitude M _2,1 is referred to for the earthquake at the epicenter depth level D ₁ where the region 2 is the epicenter, and the magnitude of the earthquake is concerned. If M is greater than M _2,1, it is determined that long-period ground motion is likely to occur.

  As the earthquake early warning data received by the communication unit 130 in the present embodiment, data including the data relating to the location of the epicenter, the data relating to the magnitude of the earthquake, and the data relating to the depth of the epicenter are used. Most commonly, the data contained in the Earthquake Early Warnings distributed by the Meteorological Agency can be used.

  Next, processing of the long-period earthquake motion warning system 100 according to the present embodiment configured as described above will be described. FIG. 8 is a diagram illustrating an example of a processing flow of the long-period earthquake motion warning system 100 according to another embodiment of the present invention.

  In FIG. 8, when the processing of the long-period earthquake motion warning system 100 is started in step S200, it is determined in the subsequent step S201 whether or not the earthquake warning data has been acquired by the communication unit 130. If an earthquake occurs in any region, the determination in step S201 is YES, and the process proceeds to step S202.

In step S202, from the earthquake early warning data received by the communication unit 130, the epicenter location region (n), which is the region including the earthquake epicenter, the earthquake magnitude M ₀ , the epicenter depth d (depth level D _i ), and To get. In step S203, the threshold table 120 is referred to, and the threshold magnitude M _{n, i} is acquired.

In the subsequent step S204, the magnitude M ₀ acquired from the earthquake early warning data is compared with the threshold magnitude M _{n, i,} and the acquired magnitude M ₀ is the threshold magnitude M _{n, i.}
It is determined whether it is larger, that is, whether M ₀ > M _{n, i} . When the determination result in step S204 is YES, the process proceeds to step S205, and the arithmetic processing unit 110 issues a command to warn the alarm unit 140, the elevator control unit 150, the device control unit 160, and the like. .

  According to the other embodiment of the present invention as described above, since the information related to the epicenter depth is also used, the arrival of the long-period ground motion can be predicted with higher accuracy than the previous embodiment.

  As described above, according to the long-period ground motion warning system and the long-period ground motion warning method according to the present invention, it is possible to predict the arrival of long-period ground motion with relatively high accuracy with a simple system configuration that does not cost. Further, according to the long-period ground motion warning system according to the present invention, it is possible to appropriately issue a warning operation command based on the predicted arrival of long-period ground motion, and it is possible to reduce damage such as elevator confinement. .

DESCRIPTION OF SYMBOLS 100 ... Long period earthquake motion warning system 110 ... Operation processing part 120 ... Threshold table 130 ... Communication part 140 ... Alarm part 150 ... Elevator control part 160 ... Apparatus control part

Claims (7)

A communication unit that receives earthquake early warning data;
A threshold table that stores a predetermined area and a threshold magnitude that is a threshold for performing a warning action in association with each other;
From the earthquake early warning data received by the communication unit, obtain the location area of the epicenter, which is the area including the epicenter of the earthquake, and the magnitude,
By referring to the threshold table, the threshold magnitude corresponding to the epicenter location area is acquired,
An arithmetic processing unit that compares the magnitude acquired from the earthquake early warning data with the threshold magnitude, and instructs to perform a warning operation when the acquired magnitude is larger than the threshold magnitude,
A long-period ground motion warning system characterized by comprising: A communication unit that receives earthquake early warning data;
A threshold table that stores a predetermined area and a threshold magnitude that is a threshold for performing a warning action in association with each other;
From the earthquake early warning data received by the communication unit, the location of the epicenter, the magnitude, and the depth of the epicenter are obtained, including the epicenter of the earthquake,
By referring to the threshold table, a threshold magnitude corresponding to the epicenter location region and the depth of the hypocenter is obtained,
An arithmetic processing unit that compares the magnitude acquired from the earthquake early warning data with the threshold magnitude, and instructs to perform a warning operation when the acquired magnitude is larger than the threshold magnitude,
A long-period ground motion warning system characterized by comprising: The long-period earthquake motion warning system according to claim 1 or 2, wherein the warning operation is lighting of a warning light or sounding of a warning sound. The long-period ground motion warning system according to any one of claims 1 to 3, wherein the warning operation is control of an elevator. Preparing a threshold table for storing a predetermined area and a threshold magnitude that is a threshold for performing a warning action in association with each other;
Receiving earthquake early warning data;
Obtaining a source location area, which is an area including an earthquake source, and a magnitude from the received earthquake early warning data;
Obtaining a threshold magnitude corresponding to the epicenter location region by referring to the threshold table;
A long-period seismic motion warning method comprising: comparing magnitude acquired from earthquake early warning data with a threshold magnitude, and instructing to perform a warning action when the acquired magnitude is greater than the threshold magnitude. Preparing a threshold table for storing a predetermined area and a threshold magnitude that is a threshold for performing a warning action in association with each other;
Receiving earthquake early warning data;
Obtaining the location of the epicenter, the magnitude, and the depth of the epicenter from the received early earthquake data,
Obtaining a threshold magnitude corresponding to the epicenter location region and the depth of the epicenter by referring to the threshold table;
A long-period seismic motion warning method comprising: comparing magnitude acquired from earthquake early warning data with a threshold magnitude, and instructing to perform a warning action when the acquired magnitude is greater than the threshold magnitude. In the step of preparing the threshold table,
Correct the observation results of long-period earthquakes based on both the ground motion response characteristics of the ground in the area where the target building is located and the natural vibration period of the target building.
The long-period earthquake motion warning method according to claim 5, wherein the long-period earthquake motion warning method is prepared by obtaining a threshold magnitude that is a threshold for performing a warning operation.

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