JP3113345U - Earthquake detection system - Google Patents

Abstract

The present invention provides a small earthquake detection system that can detect micro-earthquakes and electromagnetic waves generated in the ground and can respond locally.
A fine vibration detection device of the present invention is provided on the bottom of a well and has a receiver including a plurality of small pieces that can move by fine vibrations of water, and an ultrasonic wave that detects the positions of the plurality of small pieces. It is characterized by comprising a sensor and means for converting the position of a plurality of small pieces detected by the ultrasonic sensor into an image.
[Selection] Figure 1

Description

  The present invention relates to an earthquake detection system. More specifically, the present invention relates to an earthquake detection system including a micro vibration detection device and an electromagnetic wave detection device.

  From the shocking facts of the Great Hanshin Earthquake, 10 years later, the three major elements of earthquake countermeasures in Japan, one of the world's leading earthquake powers, are (a) forecasting, (b) disaster prevention, and (c) reconstruction. As a trump card for relief, scientific earthquake prediction is indispensable in order to issue a so-called earthquake forecast where the forecast (a) is an important point.

  It has been the norm among scientists since 1980 that electromagnetic phenomena occur in the bedrock destroyed inside the crust as a precursor of an earthquake. For example, in Greece, abnormal observation of electromagnetic waves has been introduced to earthquake prediction since the early 1980s as a VAN method, and now the prediction accuracy is also highly evaluated.

  However, there is a big risk in earthquake prediction, especially in the case of immediately preceding prediction. In the concerned countries, due to the top-down of the central organization, in the case of large scale earthquakes or large earthquakes, immediately preceding prediction, earthquake forecast, evacuation advisory, disaster prevention order However, it is no exaggeration to say that the decision is the most important matter because of the strict decision made in the disaster prevention announcement.

Currently, the following prediction categories are the world trend.
(1) Long-term prediction: Within 10 years to several years (2) Medium-term prediction: Within several years to months (3) Short-term prediction: Within months to weeks (4) Immediately preceding prediction: Within weeks to days The above VAN method In the prediction system, large facility equipment is installed in the regional center, and the collected data is intensively analyzed by the national central organization and the central prediction center. As for the identification of the epicenter, epicenter, and magnitude of the earthquake, there are ionosphere observations in addition to the above-mentioned geocurrent observation by the VAN method. In the epicenter and its local area, there are few methods for recognizing earthquake precursors.

  For this reason, in the central center, when analyzing the data in the suburbs of the epicenter and finally making a judgment on the immediately preceding prediction, it depends on the master craftsmanship of the general manager. As a countermeasure, a small detector is required.

  For example, Patent Document 1 discloses an electromagnetic field associated with a rapid movement in the crust as an electromagnetic field fluctuation related to a precursory phenomenon for predicting an earthquake can be efficiently captured with a good signal-to-noise ratio. This is an electromagnetic field observation method related to a precursor phenomenon that enables prediction of crustal deformation by detecting a field signal, and is received by a receiving device from a covered wire that should be a long antenna laid on the ground surface or underground It describes that an electromagnetic field variation is measured by capturing a signal and detecting an abnormal electric field strength and position.

  And in patent document 1, as the said covered electric wire, the submarine cable or the conductive wire of the optical submarine cable or the conductive core wire is used, the received signal is captured by the receiving device on land from one end of the covered electric wire, and at least the covered wire Use parallel paired wires or balanced twisted wires for the land portion of the wire, and attach the bottom of the ground via an impedance matching resistor to the tip of one of the core wires, and capture the received signal from the both ends of the covered wire with the receiving device on land doing.

  Moreover, in patent document 1, the said covered electric wire is arrange | positioned orthogonally or as a right angle as two dipole antennas, and each of the cores with high magnetic conductivity and small iron loss formed by winding the covered electric wire in three axes orthogonally. A loop antenna is formed on the axis of the winding, and parallel pairs or balanced pairs of twisted wires are connected to the beginning and end of winding of the winding, and the antennas are arranged at a plurality of locations.

  Furthermore, in Patent Document 1, as an electromagnetic field observation system related to a precursor phenomenon that can detect an electromagnetic signal associated with a rapid movement in the crust and predict crustal deformation, the system is installed on the surface or underground of the target area. And a receiving device that measures electromagnetic field fluctuations by capturing a received signal from one or both ends of the antenna constituted by the covered wire and detecting an abnormal electric field strength and position. Are disclosed.

  In addition, in Patent Document 2, in the case of a method of collecting acceleration waveforms based on the conventional principle of electromagnetic induction, if electromagnetic noise is generated near the sensor, it may malfunction due to this noise, resulting in a lack of reliability. In view of the fact that the electromagnetic coil is used and it is expensive, an object of the present invention is to provide a vibration speed detection type earthquake sensor that does not malfunction due to electromagnetic noise and can be manufactured at low cost.

  The vibration speed detection type seismic sensor disclosed in Patent Document 2 is a pendulum configured to obtain an omnidirectional movement proportional to the direct vibration speed by an overbraking mechanism, and a displacement of the pendulum by an optical sensor. And a control circuit configured to output a control signal when the displacement reaches a certain level or more.

JP 2002-267762 A Japanese Patent Laid-Open No. 6-214040

  It is already known that microtremors and electromagnetic waves (hereinafter referred to as electromagnetic waves, etc.) are generated in the ground as precursors of earthquakes. However, the occurrence of electromagnetic waves, etc. is detected and No small earthquake detection system has yet been proposed that can display changes and be installed in any region.

  An object of the present invention is to provide a small-sized earthquake detection system that can detect electromagnetic waves and the like generated in the ground and can cope with them locally.

A fine vibration detection device according to a first aspect of the present invention is provided on the bottom of a well, and includes a receiver including a plurality of small pieces that can be moved by fine vibration of water;
An ultrasonic sensor for detecting the positions of the plurality of small pieces;
And a means for converting the positions of a plurality of small pieces detected by the ultrasonic sensor into an image.

  Further, the receiver includes a plate made of a metal having corrosion resistance and a plurality of support columns standing on the plate, and the plurality of small pieces are connected to a corrosion-resistant rod stretched between the plurality of support columns. It is preferable that it is attached via the formed yarn.

  In addition, the receiver includes one or two or more support columns standing on the bottom of the well, and the plurality of small pieces are connected to a corrosion-resistant rod provided in a cantilever manner on the one or more support columns. It can also be constituted so that it is attached via the formed thread.

  Moreover, it is preferable that the said small piece is a fine reaction piece.

  The electromagnetic wave detection device according to the second aspect of the present invention has a double structure comprising an outer cylinder and an inner cylinder inserted into the outer cylinder, has a length of at least 20 m, and is buried in the ground. It is preferable that the pipe is provided with a direct current sensor provided at an end portion of the underground side of the pipe.

  A third aspect of the present invention is an earthquake detection system including the fine vibration detection device and the electromagnetic wave detection device.

  ADVANTAGE OF THE INVENTION According to this invention, the electromagnetic wave etc. which generate | occur | produced in the ground can be detected and the small earthquake detection system which can respond locally can be provided.

  And since the terminal of a micro vibration detection apparatus is provided in the bottom of a well, it can prevent reliably that it receives the influence of noise and can implement | achieve accurate micro vibration detection.

  Although the present invention can be used as a consistent earthquake detection system for each region, it can be efficiently used as an earthquake detection system for predetermining the most important items in the epicenter identified by ionospheric observations in advance. There is also an aspect that can be used.

  The earthquake detection system of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional explanatory view showing an example of the micro-vibration detecting device of the present invention, FIG. 2 is a cross-sectional explanatory diagram showing another example of the micro-vibration detecting device of the present invention, and FIG. 3 is an electromagnetic wave detecting device of the present invention. FIG. 4 is an explanatory view showing the principle of the electromagnetic wave detection device of FIG. 3.

Embodiment 1
The fine vibration detection apparatus 1 according to the present embodiment is provided on the bottom of a well W and detects a position of the receiver 10 including a plurality of small pieces 5 that can move due to fine vibrations of water, and the positions of the plurality of small pieces 5. And an image conversion means 7 for converting the positions of the plurality of small pieces 5 detected by the ultrasonic sensor 6 into an image. The well W is preferably provided with a lid 9.

  The receiver 10 is composed of, for example, a plate 2 made of a metal having corrosion resistance such as stainless steel and a plurality of support columns 3 standing on the plate 2, and the plurality of small pieces 5 are formed between a plurality of support columns. 3 is attached via an extra-fine Teggs yarn (hereinafter referred to as a yarn) S connected to a rod (for example, a stainless steel rod) having a corrosion resistance stretched to 3.

  In the present embodiment, the small piece 5 is preferably a lure (pseudo bait) -like piece, a small piece resembling a butterfly, or a fine reaction piece such as a thin strip, a float, or a flywheel.

  Referring to FIG. 2, the modified example of the fine vibration detection device 1 according to the present embodiment is also provided with a plurality of small pieces 5 that are provided at an arbitrary depth of the well W and can be moved by fine vibrations of water. A body 10, an ultrasonic sensor 6 that detects the positions of the plurality of small pieces 5, and an image conversion means 7 that converts the positions of the plurality of small pieces 5 detected by the ultrasonic sensor 6 into images. The receiver 10 includes one or two or more support columns 3 standing at an arbitrary depth Wa of the well W, and the plurality of small pieces are provided in a cantilever manner on the one or more support columns 3. It is attached via a thread S connected to a rod 4 having corrosion resistance. This modification is effective when the depth of the well W is excessive or the water bottom Wa is not flat.

  The ultrasonic wave sensor 6 and the means 7 for converting the positions of the plurality of small pieces 5 detected by the ultrasonic sensor 6 into images are electrically connected by electric wires 8. As the ultrasonic wave sensor 6 and the means 7 for converting the positions of the plurality of small pieces 5 detected by the ultrasonic sensor 6 into an image, a known fish finder can be preferably used.

Embodiment 2
Referring to FIG. 3, the electromagnetic wave detection device 11 according to the present exemplary embodiment includes a double structure including an outer cylinder 12 and an inner cylinder 13 that is inserted into the outer cylinder 12 and has the same length L as the outer cylinder 12. It is comprised from the pipe 14 of this. The length L of the outer cylinder 12 and the inner cylinder 13 is preferably at least 20 m. It is preferable that a DC sensor 15 is provided at the underground end of the pipe 14 embedded in the ground. The current detected by the DC sensor 15 is transmitted to the measuring device 17 via the pipe 14 and the electric wire 16 and recorded.

  Next, the principle of the DC sensor 15 used in the electromagnetic wave detection device 11 of the present embodiment will be described with reference to FIG.

  Although it is already known that microtremors and electromagnetic waves (hereinafter referred to as electromagnetic waves) occur in the ground as precursors of an earthquake, according to Lenz's law, changes in electromagnetic waves are not Reflected. Therefore, by thoroughly blocking noise, the directionality from the observation point to the epicenter is always constant at the specific observation point in the geoelectric current observation. It is consistent with. Also, according to Faraday's law, it is consistent with the magnitude of the earthquake precursor energy of electromagnetic waves at the observation point. In other words, since the electromagnetic force is proportional to the current in a constant magnetic field, the change in the electromagnetic force (that is, the change in the strength of the electromagnetic wave) can be recognized by recording the change in the ground current. The DC sensor 15 includes a lead plate 15b buried in the ground, an electrode 15c, and a tester 15a, and the tester 15a, the lead plate 15b, and the electrode 15c are connected by an electric wire 15d.

Embodiment 3
The earthquake detection system of the present invention is composed of the fine vibration detection device 1 of the first embodiment and the electromagnetic wave detection device 11 of the second embodiment.

It is sectional explanatory drawing which shows an example of the micro vibration detection apparatus of this invention. It is sectional explanatory drawing which shows the other example of the micro vibration detection apparatus of this invention. It is sectional explanatory drawing which shows an example of the electromagnetic wave detection apparatus of this invention. It is explanatory drawing which shows the principle of the electromagnetic wave detection apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fine vibration detection apparatus 2 Metal plate 3 Support | pillar 4 Rod 5 Small piece 6 Ultrasonic sensor 7 Image conversion means 8 Electric wire 9 Lid 10 Receiver 11 Electromagnetic wave detection apparatus 12 Outer cylinder 13 Inner cylinder 14 Pipe 15 DC sensor 16 Electric wire 17 Measuring apparatus S Thread W Well

Claims (6)

A receiver provided with a plurality of small pieces provided at the bottom of the well and capable of moving by minute vibrations of the water;
An ultrasonic sensor for detecting the positions of the plurality of small pieces;
A fine vibration detection apparatus comprising: means for converting the positions of a plurality of small pieces detected by the ultrasonic sensor into an image. A yarn in which the receiver includes a plate made of a metal having corrosion resistance and a plurality of support columns erected on the plate, and the plurality of small pieces are connected to a corrosion-resistant rod stretched between the plurality of support columns. The fine vibration detection apparatus according to claim 1, wherein the fine vibration detection apparatus is attached via The receiver includes one or more struts standing on a well, and the plurality of small pieces are connected to a rod having corrosion resistance provided in a cantilever manner on the one or two or more struts via a thread The fine vibration detection device according to claim 1, wherein the fine vibration detection device is attached. 4. The micro vibration detection device according to claim 1, wherein the small piece is a fine reaction piece. DC sensor having a double structure consisting of an outer cylinder and an inner cylinder inserted into the outer cylinder, having a length of at least 20 m, and provided at the underground end of a pipe buried in the ground An electromagnetic wave detection device comprising: An earthquake detection system comprising the fine vibration detection apparatus according to claim 1, and the electromagnetic wave detection apparatus according to claim 5.

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