JP2021143520A - Disaster monitoring device and disaster monitoring method - Google Patents

Abstract

To provide a disaster monitoring device and a disaster monitoring method that monitor all the time unstable slopes and roads with terrain conditions feared of sudden collapses, detect signs or occurrences of disasters and prevent human damages by collaborating with alarms or traffic barriers or both.SOLUTION: Provided are a detecting means that acquires at least the current condition information of targets being monitored such images of the ground, sound, or vibration, and detects abnormality of the ground, an analysis means that analyzes the detection data of the ground abnormality detected by the detecting means, a disaster evaluation means that evaluates disaster occurrence from the analysis results analyzed by the analysis means and a notification means that notifies road managers of the evaluation results from the disaster evaluation means, the analysis means analyzes the time and frequency of occurrences of the ground abnormality, and the disaster evaluation means evaluates the risk of a disaster from the frequency of occurrences of the ground abnormality per unit time and its increasing or decreasing tendency.SELECTED DRAWING: Figure 1

Description

The present invention relates to a disaster monitoring device and a disaster monitoring method which are information sources for monitoring rockfall / collapse from a slope and depression of a road and ensuring local safety.

On slopes where the ground is unstable, there are disaster factors such as landslides, rockfalls, and collapses. As a technique for monitoring these risk factors and warning of danger, a method of measuring the inclination of the ground or the displacement of the ground surface and monitoring the displacement amount and the displacement speed is often used.

However, these monitoring methods are effective for deformation of landslide slopes with slow activity, but less effective for phenomena such as sudden rockfalls and collapses. In order to deal with this problem, a device that issues an alarm when the wire installed in a dangerous place becomes tense or cut, and a device that detects the impact or pressure of a rockfall or collapse and issues an alarm have been put into practical use. There were problems such as not responding even if a place different from the place where it was installed was deformed, malfunctioning due to the invasion of wild animals, and high cost for installation and construction.

In addition, as a method different from the above-mentioned method, a technique called acoustic emission (hereinafter referred to as "AE") has attracted attention and was actively studied in the 1990s. AE is intended to predict collapse by capturing extremely fine low-frequency vibrations when microscopic cracks occur in rock mass with a high-precision AE sensor (Patent Documents). 1 to 4).

However, the current situation is that this AE technology is not widely used as a ground disaster monitoring technology because of its high cost of introduction to the site and its weakness to electromagnetic noise and vibration noise.
On the other hand, disasters such as hollowing out, sinking and collapse occur frequently not only on slopes but also on the road itself, but suddenly there is no suitable method other than exploration by ground penetrating radar. When a road collapses or collapses, a passing vehicle falls and causes casualties.

Under the above circumstances, it is necessary to develop a technology for monitoring sudden disasters in places where there is a possibility of slope disasters and road collapses.

Japanese Unexamined Patent Publication No. 2009-007914 Japanese Unexamined Patent Publication No. 2001-241045 Japanese Unexamined Patent Publication No. 11-183448 Japanese Unexamined Patent Publication No. 08-313309

In view of the above-mentioned conventional drawbacks, the present invention constantly monitors unstable ground and roads in terrain conditions where there is a concern of sudden collapse and depression, and detects a sign of disaster or the occurrence of a disaster. The purpose is to provide disaster monitoring devices and disaster monitoring methods that prevent human damage in cooperation with alarms and / or traffic barriers.

In order to achieve the above object, the disaster monitoring device according to claim 1 of the present invention acquires at least the current state information of the monitoring target such as an image of the ground, sound or vibration, and detects the abnormality on the ground. The sensing means, the analysis means for analyzing the detection data of the ground abnormality detected by the sensing means, the disaster evaluation means for evaluating the occurrence of a disaster from the analysis result analyzed by the analysis means, and the disaster evaluation means. The analysis means analyzes the time and the number of times the ground abnormality has occurred, and the disaster evaluation means per unit time of the ground abnormality. It is characterized by evaluating the risk of disaster from the frequency of occurrence and its increasing / decreasing tendency.

The disaster monitoring device according to claim 2 is characterized in that the detection means and the recording device are provided on the ground to be monitored, and an auxiliary monitoring device for accumulating the detection data regarding the abnormality of the ground is further provided. And.

The disaster evaluation means of the disaster monitoring device according to claim 3 has arbitrarily set the number of times and the excess time exceeding the strength arbitrarily set for the sound or vibration detected by the sensing means, or both. It is characterized in that the number of times the intensity is lowered and the time of the time falling below the strength are statistic, and each number of times or the total time is used as an evaluation material for a precursory phenomenon of a disaster, and the road administrator is notified by the notification means.

The disaster monitoring method according to claim 4 has a sensing step of detecting an abnormality on the ground by a sensing means and transmitting the sensed data on the detected abnormality of the ground to an analysis means, and a ground transmitted in the sensing step. In the analysis step, the ground abnormality occurred, including an analysis step of analyzing the anomaly of the above by an analysis means and a disaster evaluation step of evaluating the occurrence of a disaster by the disaster evaluation means from the result of the analysis in the analysis step. The time and number of times are analyzed, and the disaster evaluation process is characterized in that the risk of a disaster is evaluated from the frequency of occurrence of the abnormality on the ground per unit time and the tendency of increase or decrease thereof.

The disaster monitoring method according to claim 5 includes a sensing data acquisition step of acquiring the sensing data provided on the ground and accumulating the sensing data for a predetermined period from the auxiliary monitoring device having the sensing means and the recording device, and the sensing data acquisition step. It is characterized in that a post-processing step of analyzing the sensed data acquired in the above-mentioned analysis means by the analysis means and a feedback step of feeding back the analysis result obtained in the post-processing step to the disaster evaluation means are further performed.

In the disaster evaluation step of the disaster monitoring method according to claim 6, the intensity of the sound or vibration detected by the sensing means, or both, is arbitrarily set as the number of times and the excess time exceeding the intensity set arbitrarily. It is characterized in that the number of times the intensity is lower and the time the time is lower than the intensity are statistic, and each number or total time is used as an evaluation material for a precursory phenomenon of a disaster.

As is clear from the above description, the following effects can be obtained in the present invention.
(1) In each of the inventions according to claims 1 and 4, it is possible to analyze the abnormality of the ground detected by the sensing means, evaluate the risk of occurrence of a disaster, and notify the evaluation result.
Therefore, it is possible to detect a sign of a disaster such as a slope or a road or a disaster, and prevent human damage in cooperation with an alarm, a traffic barrier, or both.
(2) Further, since a wide range of ground can be monitored by the sensing device, it is possible to monitor a phenomenon caused by a disaster factor that occurs in a place that cannot be pinpointed.
(3) Since it is only necessary to install it near the ground to be monitored, it is easy to install and maintain, and it can be monitored even at night.
(4) Since the disaster risk can be appropriately evaluated by the disaster evaluation means, the road manager can be promptly notified of the disaster risk via the notification means.
(5) By acquiring the three-dimensional information of road attachments, disasters can be predicted more accurately.
(6) Each of the inventions according to claims 2 and 5 also has the same effects as those in (1) to (5) above, and an auxiliary monitoring device is installed to perform a post processing step and a feedback step. As a result, it becomes possible to improve the capacity of the disaster evaluation means, which is a method for improving the accuracy of real-time monitoring in long-term operation.
Further, the auxiliary monitoring device can be used not only for continuous monitoring but also for intermittent monitoring, and an inexpensive device can be applied.
(7) Each of the inventions according to claims 3 and 6 can obtain the same effects as those of (1) to (6) above, and sounds and vibrations exceeding an arbitrarily set intensity (threshold value). By evaluating the number and frequency of detections, disasters can be evaluated more accurately.

1 to 3 are explanatory views showing a first embodiment of the present invention.
4 to 6 are explanatory views showing a second embodiment of the present invention.
7 to 9 are explanatory views showing a third embodiment of the present invention.
The block diagram of the disaster monitoring apparatus of 1st Embodiment. Schematic diagram showing the usage status of the disaster monitoring device. The process chart of the disaster monitoring method of 1st Embodiment. The block diagram of the disaster monitoring apparatus of the 2nd Embodiment. Schematic diagram showing the usage status of the disaster monitoring device. The process chart of the disaster monitoring method of 2nd Embodiment. The block diagram of the disaster monitoring apparatus of the 3rd Embodiment. Schematic diagram showing the usage status of the disaster monitoring device. The process chart of the disaster monitoring method of 3rd Embodiment.

Hereinafter, the present invention will be described in detail in accordance with the embodiments shown in the drawings for carrying out the present invention.

In the first embodiment for carrying out the present invention shown in FIGS. 1 to 3, 1 monitors the ground 2 such as a slope, a road surface, and a slope, predicts a disaster occurring on the ground, and is a road manager or the like. It is a disaster monitoring device that can support disaster management of roads in Japan.

As shown in FIG. 1, the disaster monitoring device 1 acquires at least the current state information of the monitoring target of at least the image of the ground 2, the sound generated on the ground 2, or the vibration generated on the ground 2, and the ground. Occurrence of a disaster from the sensing means 3 that detects the abnormality of 2 and the analysis hand 4 steps that analyze the sensing data about the abnormality of the ground 2 detected by the sensing means 3 and the analysis result analyzed by the analysis means 4. It is composed of a disaster evaluation means 5 for evaluating the above and a notification means 6 for notifying the road manager of the evaluation result of the disaster evaluation means 5.

Here, the "ground 2" includes a slope, a road (including a structure such as a bridge or a tunnel), a flat surface, a slope, and the like, and in the present embodiment, the slope 2 as an example of the ground 2. The case of monitoring is described.

In the present embodiment, the sensing means 3 detects an abnormality on the ground 2 by using a sensing device 8 provided on the monitoring device main body 7 provided at a predetermined interval on the ground 2 to be monitored. The sensing device 8 includes an image receiving device 9 capable of acquiring an image of the ground 2, a sound receiving device 10 that detects sound generated on the ground 2 to be monitored (including the vicinity of the ground 2), and the ground 2 to be monitored. It is composed of a vibration receiving device 11 that senses vibration generated in (including the vicinity of the ground 2). In the present embodiment, the image receiving device 9, the sound receiving device 10, and the vibration receiving device 11 are all provided, but the sensing means 3 may be provided with only one of them.

By the way, the image receiving device 9 may constantly acquire an image of the ground 2 and have the analysis means 4 described later analyze the image, or acquire the image only when there is a change in the ground 2. May be good.

As the image receiving device 9, a device capable of acquiring an image of the monitored ground 2 such as a camera is used, and the image receiving device 9 is provided on the disaster monitoring device main body 7 installed at a place separated from the monitored ground 2 by a predetermined distance.
In the present embodiment, not only the image receiving device 9, but also the sound receiving device 10, the vibration receiving device 11, the disaster evaluation means 5, and the notification means 6 are installed at a place separated from the monitored ground 2 by a predetermined distance. It is provided (built-in) in. A recording device 12 for recording abnormal data, analysis results, evaluation results, etc. of the ground 2 detected by the sensing means 3 is also built in the disaster monitoring device main body 7. That is, in the present embodiment, it can be said that the disaster monitoring device 1 is substantially the same as the disaster monitoring device main body 7. As shown in FIG. 2, the disaster monitoring device main body 7 (disaster monitoring device 1) is provided at a predetermined distance from the ground 2 (slope 2) to be monitored, and constantly monitors the ground 2.

The sound receiving device 10 uses a sound collecting device such as a microphone, and cracks and rockfalls, tree root tearing sounds, crushing sounds of the ground and structures, and rockfalls and collapsed rocks generated on the monitored ground 2 become the ground and structures. Detects sounds such as contact sounds.
The vibration receiving device 11 uses a vibration sensor that detects vibrations during rockfall, cracks, and rock collapse.

When the slope is monitored, the foreign matter captured by the image receiving device 9 as an image includes not only falling rocks but also dust and fallen leaves, and when used for the above detection, these dust and fallen leaves become noise. Therefore, in the present embodiment, by further using the sound receiving device 10 and the vibration receiving device 11 and combining the sensing by sound and vibration, it becomes possible to distinguish between the falling rock and the others, and a change is observed in the image. The types of changes confirmed in the image can be classified by the analysis means 4 or the like by cross-referencing the timing, and the abnormality of the ground 2 can be detected with higher accuracy.

Further, by accumulating these data in the recording device 12, analyzing and learning, even when only the image receiving device 9 is provided, it becomes possible to more accurately detect the deformation of the ground.

The analysis means 4 is connected to the sensing means 3, receives data on the abnormality of the ground 2 detected by the sensing means 3, and analyzes the data. In the present embodiment, the analysis software installed in the arithmetic unit 23 built in the disaster monitoring device main body 7 is used as the analysis means 4.

For example, the image, sound, and vibration of the abnormality of the ground 2 detected by the sensing means 3 are arranged at each timing, and the frequency of the phenomenon related to the disaster is analyzed. That is, the number (frequency) of occurrences (frequency) of abnormal sounds and vibrations such as the sound of breaking tree roots, the sound and vibration of crushing rocks and structures, and the sound of falling rocks and collapsing rocks coming into contact with the ground and structures are analyzed. At this time, the above-mentioned changes such as dust and fallen leaves are treated as noise and are not counted in the frequency of occurrence of abnormalities.

The disaster evaluation means 5 uses evaluation software installed in the arithmetic unit 23 built in the monitoring device main body 7, organizes the frequency of occurrence of analyzed abnormalities on a timeline, and tends to increase or decrease the frequency of occurrence per unit time. (Increasing tendency) is evaluated, and if a remarkable increasing tendency is observed, it is evaluated that the risk of a ground disaster is high, and the evaluation result is notified to the road manager or the like using the notification means 6.

Specifically, for the sound or vibration detected by the sensing means 3, or both intensities, the number and time of exceeding the arbitrarily set intensity, and the number of times and the time of falling below the arbitrarily set intensity are statistically measured. Then, each number of times or total time is evaluated as an evaluation material for a precursory phenomenon of a disaster, and the road manager is notified by the notification means 6.

That is, when sound or vibration exceeding the arbitrarily set intensity is detected, or when sound or vibration below the arbitrarily set intensity is detected, the number of times and the time are counted to make it more accurate. Can predict and evaluate disasters.

For example, when the sound (vibration) when there is no abnormality is generally within a predetermined range, the upper limit of the normal sound is the upper limit of the predetermined range, and the lower limit when it is determined that an abnormality has occurred is within the predetermined range. It is assumed that the upper limit is set to plus several% to several%. When evaluating the risk of disaster occurrence based only on intensity, an alarm (notification to the road administrator) is issued each time a sound or vibration (peak intensity) generated for a moment is detected, and the alarm is issued and canceled repeatedly. However, for example, by setting the number of excesses and the excess time, such as setting the intensity above the lower limit when determining that the abnormality has occurred, twice or more per hour for two consecutive hours, etc., a disaster occurs. An alarm can be issued in an imminent situation.

In addition, by making statistics on the total time of the situation below the upper limit of the normal sound, it is possible to evaluate the situation where the abnormality of the ground 2 occurs intermittently or continuously. If this statistical time is organized into 24 hours, it is possible to issue an alarm the day before the occurrence of a disaster, and it is possible to suppress the issuance of false alarms in normal times.
These intensities are sensed by the vibration receiving device 9, the sound receiving device 10, and the like.

The notification means 6 uses a communication device or the like built in the monitoring device main body 7, and transmits the evaluation result evaluated by the disaster evaluation means 5 to a terminal used by the road administrator or the like by wire or wirelessly.
In addition, all the evaluation results evaluated by the disaster evaluation means 5 may be designated to the road manager or the like, or when a certain threshold value or the like is used and the threshold value is exceeded (the risk of disaster occurrence is high). The road administrator may be notified only to.

Further, the disaster evaluation means 5 and the notification means 6 (and the analysis means 4 if necessary) may be provided on another terminal connected to the monitoring device main body 7 by wire or wirelessly, for example, a road manager or the like. It may be installed in a terminal used by the user, a server on the Internet, or the like. When the terminal used by the road administrator or the like is provided with the disaster evaluation means 5 or the like, the image, sound, and vibration data acquired by the sensing means 3 built in the monitoring device main body 7 are transmitted to the terminal and analyzed by this terminal. , The operation is performed. As the notification means 6, it is conceivable that the result of the disaster evaluation is displayed on a display or the like to be notified.

By the way, as shown in FIG. 3, the disaster monitoring method 13 for monitoring a disaster using the disaster monitoring device 1 of the present invention detects an abnormality on the ground 2 by the sensing means 3 and analyzes the detected abnormality on the ground. A sensing step 14 that transmits to the means 4, an analysis step 15 that analyzes the detected abnormality of the ground 2 by the analysis means 4 when the abnormality of the ground is detected by the sensing step 14, and an analysis step 15 that analyzes the abnormality by the analysis step 15. The disaster evaluation process 16 for evaluating the occurrence of a disaster by the disaster evaluation means 5 and the notification process 17 for notifying the road manager of the evaluation result evaluated by the disaster evaluation process 16 by the notification means 6 are included.

In the sensing step 14, the sensing means 3, in the present embodiment, the sensing device 8 is used to detect the abnormality on the ground 2, and the detected abnormality data is sent to the analysis means 4 connected to the sensing means 3 by wire or wirelessly. ..

In the analysis step 15, the analysis means 4 is used to analyze the data sent from the sensing means as described above.

In the disaster evaluation step 16, based on the analysis result analyzed in the analysis step 15, a disaster that occurs on the slope 2 or a structure, a road, or the like located below the slope 2 is evaluated.
In the notification process 17, the evaluation result evaluated in the disaster evaluation process 16 is notified to the road manager as necessary. This notification step 17 may not be performed when the probability of disaster occurrence is low in the disaster evaluation step 16, but may be performed only when the probability of disaster occurrence is high above a certain level.

[Different forms for carrying out the invention]
Next, different modes for carrying out the present invention shown in FIGS. 4 to 9 will be described. In the description of these different embodiments for carrying out the present invention, the same components as those of the first embodiment for carrying out the present invention are designated by the same reference numerals, and duplicate description will be omitted.

In the second embodiment for carrying out the present invention shown in FIGS. 4 to 6, the main difference from the first embodiment for carrying out the present invention is that the sensing sensor 18 for detecting an abnormality on the ground 2 is used. A disaster monitoring device 1A further provided on the ground 2 to be monitored, and a sensing means 3A is configured by the sensing sensor 18 and the sensing device 8 built in the monitoring device main body 7 provided at a predetermined distance from the ground 2. In addition, an analysis step of performing analysis by the analysis means 4 based on the detection step 14A for detecting the abnormality of the ground 2 by the sensing means 3A and the sensing data regarding the ground abnormality detected by the sensing sensor 18 and the sensing device 8. In that the disaster monitoring method 13A is set to 15, even with such a disaster monitoring device 1A and the disaster monitoring method 13A, the same operation and effect as those of the first embodiment of the present invention can be obtained, and the monitoring device main body can be obtained. The sensing sensor 18 provided outside the 7 can capture rockfalls at positions that cannot be captured by the sensing device 8 alone, small-level sounds and vibrations, and the like, which is the case when the scale of the ground 2 to be monitored is large. However, the accuracy of evaluating the occurrence of an abnormality on the ground 2 can be improved.

In addition, if the site has poor visibility due to thick fog, or if the resolution of sound / vibration is poor due to noise, unclear information may affect the analysis in an inaccurate direction, so the intelligibility and time of the information. It is possible to perform highly accurate disaster evaluation (provide a quality maintenance mechanism) by switching with a band or the like.

By the way, the sensing sensor 18 is provided with a transmitter or the like, and the sensing data regarding the abnormality of the ground detected through the transmitter is sent to the analysis means 4. As the sensing sensor 18, a sensor that captures sound, vibration, or the like can be appropriately used.
In addition, "provided on the ground 2" means that it is provided so as to be in contact with the ground 2 to be monitored (including standing), or is provided with a slight interval on the ground 2 to be monitored. Including cases.

In the third embodiment for carrying out the present invention shown in FIGS. 7 to 9, the main difference from the first embodiment for carrying out the present invention is that the sensing means is placed on the ground 2 to be monitored. A disaster monitoring device 1B having 3 and a recording device 12 and further provided with an auxiliary monitoring device 19 for accumulating data on the abnormality of the ground 2, and sensing data (ground) accumulated from the auxiliary monitoring device 19 for a predetermined period of time. The sensing data acquisition step 20 for acquiring the abnormality), the post-processing step 21 for analyzing the sensing data acquired in the sensing data acquisition step 20 with the analysis means 4, and the analysis obtained in the post-processing step 21. The first embodiment of the present invention also uses the disaster monitoring device 1B and the disaster monitoring method 13B in that the disaster monitoring method 13B further performs the feedback step 22 for feeding back the result to the disaster evaluation means 5. The same effect as that of the above can be obtained, and the information analyzed / disaster evaluated by the monitoring device main body 7 or the like can be strengthened by using the information collected from the auxiliary monitoring device 19.

That is, although no effect can be obtained for real-time monitoring, conversely, the auxiliary monitoring device 19 can be used for intermittent monitoring instead of continuous monitoring, making it possible to apply an inexpensive device and the analysis results obtained by post-processing. By feeding back to the disaster evaluation means 5 (software, etc.), it is possible to improve the monitoring ability even when the monitoring device main body 7 is used to monitor the ground 2, and therefore, in long-term operation. Can improve the accuracy of real-time monitoring.

As for the sensing means 3 included in the auxiliary monitoring device 19 of the present embodiment, the sensing device 8 and the sensing sensor 18 can be appropriately combined to form the sensing means 3.

In the present embodiment, an arithmetic unit 23A is provided separately from the monitoring device main body 7, and the detection data of the monitoring device main body 7 and the auxiliary monitoring device 19 are aggregated in the arithmetic unit 23A to perform the post processing step 21. .. The arithmetic unit 23A is also provided with an analysis means 4, a disaster evaluation means 5, and a recording device 12 as needed.

The present invention is used in a road management project for monitoring slope disasters, road disasters, etc. and preventing human damage.

1, 1A, 1B: Disaster monitoring device, 2: Ground,
3, 3A: Sensing means, 4: Analytical means,
5: Disaster assessment means, 6: Notification means,
7: Monitoring device body, 8: Sensing device,
9: Image receiving device, 10: Sound receiving device,
11: Vibration receiving device, 12: Recording device,
13, 13A, 13B: Disaster monitoring method,
14, 14A: Sensing process, 15: Analysis process,
16: Disaster evaluation process, 17: Notification process,
18: Sensing sensor, 19: Auxiliary monitoring device,
20: Sensing data acquisition process, 21: Post processing process,
22: Feedback process, 23, 23A: Arithmetic logic unit.

Claims (6)

Analysis that acquires at least the current state information of the monitoring target of any of the image, sound, and vibration of the ground, and analyzes the sensing means for detecting the abnormality on the ground and the sensing data for the abnormality on the ground detected by the sensing means. The analysis means includes means, a disaster evaluation means for evaluating the occurrence of a disaster from the analysis result analyzed by the analysis means, and a notification means for notifying the road manager of the evaluation result of the disaster evaluation means. The disaster evaluation means is a disaster monitoring device that analyzes the time and number of occurrences of ground abnormalities and evaluates the risk of disasters based on the frequency of occurrence of the ground abnormalities per unit time and the tendency of increase or decrease thereof. Either claim 1 or 2, wherein the sensing means and the recording device are provided on the ground to be monitored, and an auxiliary monitoring device for accumulating the sensing data regarding the abnormality of the ground is further provided. The disaster monitoring device described in Crab. The disaster evaluation means determines the number of times and the excess time of the sound or vibration detected by the sensing means, or both, exceeding the arbitrarily set intensity and the number of times and the time when the intensity is less than the arbitrarily set intensity. The disaster according to claim 1 or 2, wherein each number of times or total time is used as an evaluation material for a precursory phenomenon of a disaster, and the road manager is notified by the notification means. Monitoring device. A sensing step of detecting an abnormality in the ground by the sensing means and transmitting the sensed data about the detected abnormality of the ground to the analysis means, and an analysis step of analyzing the abnormality of the ground transmitted in the sensing step by the analysis means. The analysis step includes a disaster evaluation step of evaluating the occurrence of a disaster by a disaster evaluation means from the results analyzed in the analysis step. Is a disaster monitoring method for evaluating the risk of a disaster based on the frequency of occurrence of the above-mentioned ground abnormality per unit time and its increasing / decreasing tendency. The analysis means analyzes the sensing data acquisition step of acquiring the sensing data provided on the ground and accumulated for a predetermined period from the auxiliary monitoring device having the sensing means and the recording device, and the sensing data acquired in the sensing data acquisition step. The disaster monitoring method according to claim 4, further comprising a post-processing step of performing the process and a feedback process of feeding back the analysis result obtained in the post-processing step to the disaster evaluation means. In the disaster evaluation step, for the sound and vibration detected by the sensing means, or both intensities, the number of times and the excess time of exceeding the arbitrarily set intensity, and the number of times and the time of exceeding the arbitrarily set intensity are determined. The disaster management method according to any one of claim 4 or 5, wherein each number of times or total time is used as an evaluation material for a precursory phenomenon of a disaster.

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