JP2021018172A - Measuring method for data regarding earthquake - Google Patents

Abstract

To promote clarification of cause of an earthquake, propagation of oscillation, and relationship with tsunami, to predict an occurrence of a disaster beforehand, and to prevent its damage before its occurrence by acquiring various information in a portion exposed in the vicinity of a composition surface of a sinking side plate and a fixed side plate and in an inside the underground after the sinking side plate sinks under the fixed side plate.SOLUTION: A method for measuring data regarding an earthquake enables transmission of measured data to a remote location by radio communication not only during the time a measuring device 100 is exposed on ground surface but also after sinking under the fixed side plate 2 by embedding a measuring device 100 for data regarding the earthquake within a pit 11 dug from a surface 10 exposing the sinking side plate 1 in the vicinity of a composition plane where the sinking side plate 1 and the fixed side plate 2 are in touch on land on the earth or on the sea bottom.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method for measuring data on earthquakes, and is intended to measure subduction activity data at a plate boundary to prevent or mitigate a disaster.

In recent years, every time a major disaster caused by the frequent occurrence of earthquakes, tsunamis, and meteorological disasters is reported, the need for advance defense and early evacuation is being screamed.

However, research on earthquakes in Japan is mainly based on methods such as analyzing historical records of earthquake occurrences and installing observation devices at multiple locations in Japan to detect and analyze weak vibration data on the surface of the earth. Therefore, it is far from investigating the cause of an earthquake and predicting it with high accuracy, and it must be said that efforts to prevent the occurrence of a disaster have been greatly delayed.

Most of the causes of earthquakes are considered to be water vapor, seawater contamination, magma chambers, friction, collisions, thrusts, drops, explosions, impact destruction, etc. on the inside and outside of the plate and at the boundary joint surface, but especially in the deep sea and inside the crust. Due to the difficulty of collecting information, little has been clarified when and how they occur and lead to earthquakes.

Japanese Unexamined Patent Publication No. 62-58184 Japanese Unexamined Patent Publication No. 2012-237677

Therefore, the present invention presents not only various information on the exposed portion near the joint surface between the sinking side plate and the fixed side plate, but also in the underground interior after the sinking side plate sinks to the lower side of the fixed side plate. By acquiring various information from the sensor, it is necessary to promote the elucidation of the cause of the earthquake, the propagation of vibration, and the relationship with the tsunami, predict the occurrence of a disaster in advance, and prevent the damage. And.

More specifically, by embedding an information transmission device that can be used for a long time in the sinking side plate, all of the state-of-the-art technologies such as temperature, pressure, vibration, time, angle change, depth change, and position change are always built in. The challenge is to provide a system that can further advance the fact-finding survey of the plate joint surface by a mechanism that keeps sending necessary information from sinking to disappearing.

The method for measuring earthquake data according to the present invention, which has been made to solve the above problems, is to measure the subduction side plate near the joint surface where the subduction side plate and the fixed side plate are in contact with each other on land or sea floor on the earth. A measuring device for seismic data is embedded in the mine where the exposed surface of the earthquake is excavated, and measurement is performed not only while the measuring device is exposed to the ground surface but also after it sinks under the fixed side plate. The feature is that the generated data can be transmitted to a remote location by wireless communication.

Another method of measuring seismic data according to the present invention is to expose the exposed surface of the submerged plate near the junction surface where the submerged plate and the fixed plate meet on land or sea floor on the earth. A measuring device for seismic data was embedded in both the mine where the earthquake was excavated and the exposed surface of the fixed side plate was excavated, and the fixed plate was not only while the measuring device was exposed to the ground surface. It is characterized by embedding a measuring device that can transmit the measured data to a remote place by wireless communication even after sinking to the lower side.

In addition, one measuring device can receive the data transmitted from the other measuring device, and the measuring device can receive the data measured by itself or the data received from the other measuring device. If at least one of them can be transmitted to a remote place by wireless communication, for example, measurement data transmitted from a measuring device attached to a relatively deep sinking side plate is compared. It is possible to receive data with a measuring device attached to a fixed side plate with a shallow target depth, and by providing a relay function in this way, high-performance wireless communication from a deep position for a longer period of time can be expected.

Further, the measuring device is characterized in that it can measure at least one of temperature, pressure, vibration, time, angle, depth, and position.

According to the present invention, by embedding the measuring device in the sinking side plate or both the sinking side plate and the fixed side plate in advance, various information inside the underground can be obtained for a long period of time even after sinking below the fixed side plate. By obtaining information on the plate joint surface from the measuring device, it is possible to promote the elucidation of the cause of the earthquake, the propagation of vibration, the relationship with the tsunami, etc., predict the occurrence of a disaster in advance, and prevent the damage. Can be done.

The figure which shows the plate arrangement around the Japanese archipelago. Schematic plan view showing the vicinity of the joint surface between the Pacific plate and the North American plate. Schematic cross-sectional view showing the vicinity of the joint surface between the Pacific plate and the North American plate. The figure which shows the state which the measuring device is embedded in the Pacific plate which is a sinking side plate.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing the plate arrangement around the Japanese archipelago. As shown in this figure, the area around the Japanese archipelago is surrounded by four plates, the Pacific plate P1, the Philippine Sea plate P2, the Eurasian plate P3, and the North American plate P4. It is known that there is.

2 and 3 are views showing the vicinity of the junction surface between the Pacific plate P1 and the North American plate P4, and the Pacific plate P1 which is an oceanic plate is a continental plate (fixed side plate 2) as a subduction side plate 1. It is moving so as to sink in the direction of the black arrow shown in the figure with respect to the American plate P4.

FIG. 4 is a diagram showing a measuring device 100 according to the present invention. The measuring device 100 includes a sensor, a transmitter, a battery, and a case, and the sensor, the transmitter, and the battery are inside the case. It is housed, and the sensor and the transmitter can be driven by the battery, and the data acquired by the sensor can be transmitted to a remote place.

When the measuring device 100 is provided with a power generation means for generating power by natural energy such as geothermal heat, it is particularly desirable because the usable time of the measuring device can be extended.

As shown in FIG. 4, the measuring device of the present invention is to bury the exposed surface 10 of the sinking side plate 1 in the excavated pit 11.

Further, as shown in FIG. 3, the measuring device 100 of the present invention may be embedded in the excavated pits 11 and 21 on the surfaces 10 and 20 of both the sinking side plate 1 and the fixed side plate 2, respectively.

The measuring device 100 is equipped with a measuring device 100 capable of transmitting measured data to a remote place by wireless communication not only while it is exposed to the ground surface but also after it sinks under the fixed plate 1. The sensor can measure at least one of temperature, pressure, vibration, time, angle, depth and position.

For example, if the time, depth and position can be measured, it is possible to clearly measure how much the plate moves per unit time, and in addition, both the sinking side plate 1 and the fixed side plate 2 can be measured. When the time, depth and position can be measured simultaneously by the embedded measuring device 100, it is particularly desirable because the vertical fluctuations of both can be measured relatively.

In this way, the measuring device 100 is buried in the excavated pit 11 with the exposed surface 10 of the sinking side plate 1, and the measured data is remotely transmitted by wireless communication even after sinking under the fixed side plate 2. By making it possible to transmit to the ground, it is possible to obtain various information inside the underground at the plate joint surface over a long period of time by simply excavating the exposed surface without the need for deep excavation, etc. It is possible to promote the elucidation of the transmission of disasters and the relationship with tsunamis, predict the occurrence of disasters in advance, and prevent the damage.

Further, the measuring device 100 may include a receiver. By providing the receiver, when the measuring device 100 is installed on both the sinking side plate 1 and the fixed side plate 2, the measurement device 100 is transmitted from the measuring device 100 attached to the sinking side plate 1 having a relatively deep depth, for example. The measurement data can be received by the measuring device 100 attached to the fixed side plate 2 having a relatively shallow depth. By providing the relay function in this way, high-performance wireless communication from a deep position for a longer period of time can be performed. Can be expected.

At the same time as the subduction boundary shape survey and restoration work of the continental plate and the ocean plate, the vertical (vertical) fluctuation sensors of both plates are deployed to constantly observe the vertical fluctuations of both plates, so that seawater, plates, and magma can be observed. , It is possible to grasp the mutual influence-related actual conditions of both plates by each layer of the mantle, to investigate the actual conditions of earthquakes and tsunamis, and to discover means for pursuing disaster mitigation control and preventive measures.

In other words, the actual state of plate boundary subduction activity is a great clue to the actual state of earthquakes that occur in the plate boundary area.

Earthquake and tsunami boundary by acquiring information such as temperature, pressure, vibration, time, angle, depth, and position at the joint surface between the subduction side plate 1 (ocean plate) and the fixed side plate 2 (continental plate). By combining the actual conditions of the area with the existing seismic observation equipment, it is possible to verify the occurrence phenomenon of earthquakes and tsunamis and the actual conditions, and discover means for pursuing disaster mitigation control and preventive measures.

Various changes and flows in the plate-magma boundary area, which are repeatedly magnified and cooled, are also earthquakes at the junction surface of the subsidence side plate 1 (ocean plate) and the fixed side plate 2 (continental plate). It is possible to draw out the elements that can investigate the actual situation of many underground activities.

Plate boundary joints such as earthquakes caused by steam explosions due to high temperature and groundwater veins, earthquakes caused by partial destruction of plates due to gravity and pressure, groundwater flowing into magma chambers and earthquakes caused by steam explosions, etc. This is to obtain data for investigating the causes and phenomena of earthquakes caused by the mutual influence of surfaces.

It is of utmost importance to understand the actual state of steric changes and fluctuations in the process of melting the sinking plate.

As described above, according to the present invention, by embedding the measuring device in the sinking side plate in advance, information on the plate joint surface can be obtained from the measuring device for a long period of time even after sinking below the fixed side plate. Disaster prevention can be realized by predicting the occurrence of disasters such as earthquakes and tsunamis in advance and preventing the damage.

1 Infiltration side plate, 2 Fixed side plate, 10,20 surface, 11,21 pit, 100 measuring device, P1 Pacific plate, P2 Philippine Sea plate, P3 Eurasian plate, P4 North American plate

Claims (4)

In the vicinity of the joint surface where the submerged side plate and the fixed side plate meet on land or on the earth's bottom, an earthquake data measuring device is embedded in the mine where the exposed surface of the submerged side plate is excavated. Measurement of data related to earthquakes, which is characterized in that the measured data can be transmitted to a remote location by wireless communication not only while the measuring device is exposed to the ground surface but also after sinking under the fixed plate. Method. In the vicinity of the joint surface where the submerged side plate and the fixed side plate meet on land or on the earth's bottom, the exposed surface of the submerged side plate is excavated and the exposed surface of the fixed side plate is excavated. Seismic data measuring devices are embedded in both excavated mine shafts, and the measured data is transmitted by wireless communication not only while the measuring device is exposed to the ground surface but also after it sinks under the fixed plate. A method for measuring data on earthquakes, which comprises embedding a measuring device capable of transmitting to a remote location. One measuring device is capable of receiving the data transmitted from the other measuring device.
The earthquake according to claim 2, wherein the one measuring device can transmit at least one of the data measured by itself or the data received from the other measuring device to a remote place by wireless communication. How to measure data about. The method for measuring data relating to an earthquake according to claim 1, 2, or 3, wherein the measuring device can measure at least one of temperature, pressure, vibration, time, angle, depth, and position.

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