JPWO2020194577A1 - Volcano monitoring system and volcano monitoring method - Google Patents

Abstract

In volcano monitoring using muography, changes in muography data due to changes in the state of the volcano's mountain body are detected. The detector (11) is configured to be capable of detecting muons that have passed through the mountain body of the volcano to be monitored. The control unit (13) controls the directivity direction of muon detection of the detector (11). The inclinometer (12) detects the state of the mountain body of the volcano to be monitored and outputs the detection result. The analysis unit (14) includes the muon flux detected by the detector (11), the directivity direction of the detector (11) when the muon flux is detected, the detection result by the inclinometer (12), and the detection result. Acquire muonography data based on.

Description

The present invention relates to a volcano monitoring system and a volcano monitoring method.

Currently, monitoring activities are being carried out to predict the eruption of a volcano and the behavior of the volcano after the eruption, using seismographs, gravimeters, fiber sensors installed on the outer circumference of the volcano, and the like.

Patent Document 1 observes cosmic ray muons that have passed through a volcano using muography technology, and automatically detects the rise of magma, which is the cause of a volcanic eruption, to the surface of the earth without the need for human resources such as monitoring personnel. At the same time, a method for automatically estimating the fluctuation state of magma has been proposed.

Japanese Unexamined Patent Publication No. 2006-317257

However, Patent Document 1 merely observes the volcano by muography, and does not consider the influence of the state change of the mountain body on the muography. Therefore, it is difficult to identify what kind of state change of the mountain body is due to the fluctuation of the muography data.

The present invention has been made in view of the above circumstances, and an object of the present invention is to detect fluctuations in muography data due to changes in the state of a volcanic mountain body in volcano monitoring using muography.

Other challenges and novel features will become apparent from the description and accompanying drawings herein.

The volcano monitoring system according to one aspect of the present invention includes a detector capable of detecting muons that have passed through the mountain body of the volcano to be monitored, a control unit that controls the direction of muon detection of the detector, and the monitoring target. A first sensor that detects the state of a volcanic mountain body and outputs a detection result, the muon flux detected by the detector, and the direction of the detector when the muon flux is detected. It has the detection result of the state sensor and an analysis unit that acquires muonography data based on the detection result.

The volcano monitoring method according to one aspect of the present invention controls the direction of muon detection of a detector capable of detecting muons that have passed through the mountain body of the volcano to be monitored, and detects the state of the mountain body of the volcano to be monitored. , Muon based on the muon flux detected by the detector, the direction of the detector when the muon flux is detected, and the state of the detected volcanic mountain body to be monitored. It is for acquiring data.

According to one embodiment, it is possible to detect fluctuations in muography data due to changes in the state of the volcano's mountain body in volcano monitoring using muography.

It is a figure which shows the arrangement example of the detector, the inclinometer, the control part and the analysis part of the volcano monitoring system which concerns on Embodiment 1. FIG. It is a block diagram for demonstrating the configuration example of a system. It is a figure which shows the arrangement example of the detector, the inclinometer, the control part and the analysis part of the volcano monitoring system which concerns on Embodiment 1. FIG. It is a figure which shows the procedure of acquiring the muography data based on the detection of an inclination. It is a figure which shows typically the structure of the volcano monitoring system which concerns on Embodiment 2. It is a figure which shows the arrangement example of the detector, the inclinometer, the control part and the analysis part of the volcano monitoring system which concerns on Embodiment 2. FIG. It is a figure which shows the procedure of acquiring the muography data based on the detection of gravity. It is a figure which shows typically the structure of the volcano monitoring system which concerns on Embodiment 3.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same elements are designated by the same reference numerals, and duplicate explanations are omitted as necessary.

Embodiment 1
The volcano monitoring system according to this embodiment uses a muography technique. Muonography is a technology that uses the cosmic ray muons that fall from the sky as the radiation source, and by utilizing the high transparency of muons, it is possible to observe and visualize the inside of the object to be observed non-destructively.

In muography, it is necessary to measure the number of muons that have passed through the object to be observed using a detector. The path of the muon incident on the detector can be expressed by using the zenith angle θ when the zenith direction of the detector is used as the reference axis and the azimuth angle φ in the ground plane. The amount of energy lost by a muon that has passed through an object to be observed changes according to the density of substances present in its flight path. When the energy loss becomes large, the flight path changes greatly due to the scattering of the observation object by the atomic nucleus, and the flight path deviates from the detector. This is observed as a decrease in the number of muons.

Therefore, in muography, the inside of an observation object can be examined non-destructively by observing the number of muons that have passed through the observation object. Specifically, the inside of the observation object can be examined by observing the count number of muons per unit time and unit solid angle, that is, the flux. Hereinafter, the volcano monitoring system according to the present embodiment will be described in detail.

FIG. 1 is a diagram showing an arrangement example of a detector, an inclinometer, a control unit, and an analysis unit of the volcano monitoring system according to the first embodiment. As shown in FIG. 1, the volcano monitoring system 1 according to the present embodiment includes a detector 11, an inclinometer 12, a control unit 13, and an analysis unit 14.

FIG. 2 is a diagram showing an arrangement example of the detector 11, the inclinometer 12, the control unit 13, and the analysis unit 14 of the volcano monitoring system 1. The detector 11, the inclinometer 12, the control unit 13, and the analysis unit 14 are communicably connected by, for example, a communication cable. In FIG. 2, the control unit 13 and the analysis unit 14 are collectively installed in the observation facility 10.

The detector 11 is arranged in the vicinity of the volcano 100 to be monitored, and is configured to be capable of detecting muons that have passed through the mountain body of the volcano 100. The detector 11 transmits a detection signal DET indicating information on the muon flux to the analysis unit 14 to the analysis unit 14.

For the detector 11, for example, a nuclear emulsion, a scintillator, a gas type detector, or the like can be used. The nuclear emulsion is a film-shaped detector. As an example, a nuclear emulsion has a structure in which a gel composed of AgBr crystals and gelatin is applied on a plastic base. It is configured so that the locus of muons (charged particles) remains in the crystal portion of this Ag. In addition, the incident direction of muons can be specified by scanning the nuclear emulsion while changing the depth of focus and restoring the traces of muons observed as points at each depth of focus as lines.

A scintillator is a detector that uses scintillation light emitted when muons (charged particles) pass through a translucent substance such as plastic. The scintillation light is amplified using a photomultiplier tube and extracted as a signal.

The gas type detector utilizes the phenomenon that when a muon flies in a gas, the electrons of the molecules that make up the gas are knocked out of the molecule by the Coulomb force interaction with the muon, and the molecule is ionized. A detector that detects muons. By accelerating the knocked out electrons with a strong external electric field, an amplified electric signal can be created. As the gas type detector, for example, a multi-wire proportional detector (MWPC: Multi-Wire Proportional Chamber) can be used. In addition, the gas type detector can acquire the spatial position information of the muon that has passed through the inside of the detector. Considering that the spatial position information of muons can be acquired in real time, it is preferable to use a gas type detector. The detector 11 used in the present embodiment is not limited to the above-mentioned detectors, and detectors other than these may be used.

The inclinometer 12 (also referred to as a first sensor) is installed on the surface of the volcano 100 to be monitored, and transmits a detection signal ANG indicating the inclination value of the surface of the mountain to the analysis unit 14.

The control unit 13 outputs a control signal CON1 to the detector 11 to control the directivity direction of muon detection of the detector 11. Further, the control unit 13 includes information indicating which direction the muon detection of the detector 11 is directed to, for example, in the control signal CON2 and transmits the information to the analysis unit 14.

The analysis unit 14 is set to the volcano 100 to be monitored based on the information indicating the detection signal DET from the detector 11 and the directivity direction of muon detection of the detector 11 when the detection signal DET is output. Acquires muonography data having a predetermined resolution for the monitoring area.

This muonography data is created as histogram data including the muon flux values measured in each of the plurality of measurement areas set by dividing the monitoring area. Muons flying from the sky pass through the mountain body of the volcano 100 to be monitored (path P in FIG. 2) and reach the detector 11, so depending on the passing distance of the mountain body and the density of soil and rocks of the volcano 100 to be monitored. , The measured value of muon flux changes depending on the observation point. That is, when the passage distance of the mountain body is long or the density of volcanic soil and rocks is high, the number of muons reaching the detector 11 is small. If the distance traveled by the volcano is short, or if the soil and rock density of the volcano is low, the number of muons reaching the detector 11 will be large.

Hereinafter, the relationship between muography and changes in the shape of the volcano's mountain body will be described with reference to FIG. What is clarified by muonography is the density length ρL when the distance (length) of the muon passage path is L and the average density of the mountain bodies on the passage path is ρ. Therefore, in the present embodiment, the average density of the mountain body on the muon passage path, that is, the state inside the mountain body is confirmed by grasping the shape of the mountain body with an inclinometer and obtaining the distance L of the muon passage path. be able to.

In addition, by acquiring muography data at two distant timings, it is possible to confirm whether or not the density of the mountain body has changed when the shape of the mountain body has changed. Hereinafter, a specific description will be given.

First, the first muography data is acquired at the first timing, and then the second muography data is acquired again at the second timing after a certain period of time.

At this time, for example, it is conceivable that the shape of the volcanic mountain body changes due to volcanic activity between the first timing and the second timing. At this time, the inclinometer 12 can detect the change in the shape of the mountain body as the change in the inclination of the surface of the mountain body. In FIG. 2, the surface of the mountain body at the first timing is shown as SF1, and the surface of the mountain body at the second timing is shown as SF2.

In this example, in the mountain body at the second timing, the mountain body on the foot side spreads outward as compared with the mountain body at the first timing, and as a result, the inclination of the mountain body surface SF2 is larger than the inclination of the mountain body surface SF1. Is also gradual. Therefore, the distance L2 through which the muon passes through the mountain body before it enters the detector 11 at the second timing is longer than the distance L1 through which the muon passes through the mountain body before it enters the detector 11 at the second timing. .. Therefore, the muon flux in the region where the slope of the mountain body surface becomes gentle decreases between the first timing and the second timing.

As a result, the decrease in muon flux appearing in the second muonography data acquired by the analysis unit 14 by referring to the fluctuation of the inclination value detected by the inclinometer 12 is due to the change in the shape of the mountain body. Can be determined. Therefore, the analysis unit 14 can estimate the increase in the muon passage distance in the monitoring region from the change in the inclination value and the fluctuation amount of the muon flux.

Similarly, when the muon flux rises due to a change in the shape of the mountain body, it is possible to estimate the decrease in the muon passage distance in the monitoring area from the change in the inclination value and the fluctuation amount of the muon flux. ..

That is, according to this configuration, it is possible to estimate the change in the muon passage distance in the monitoring region from the change in the inclination value and the fluctuation amount of the muon flux.

Further, as described above, in order to capture the state change of the mountain body, it is necessary to acquire and compare the muography data twice at at least two different timings. However, when the second muography data is acquired when the mountain body has not changed, the state change of the mountain body cannot be captured as a matter of course. Therefore, it is desirable that the second muography data be acquired when there is a high probability that the state of the mountain body has changed.

Therefore, the second muography data may be acquired based on the inclination detected by the inclinometer 12. FIG. 3 shows a procedure for acquiring the second muography data based on the detection of the inclination. When the inclinometer 12 detects a change in inclination equal to or greater than the reference value (step S11 in FIG. 3), the detection result is automatically notified to the control unit 13 (step S12 in FIG. 3). In this case, the control unit 13 can control the detector 11 and the analysis unit 14 in response to the notification from the inclinometer 12 to acquire the second muography data (step S13 in FIG. 3). .. As a result, it can be expected that the state change of the volcano 100 to be monitored will be detected more reliably.

Here, the inclinometer 12 has been described as notifying the control unit that an inclination of more than the reference value has occurred, but the control unit 13 monitors the measured value of the inclination output from the inclinometer 12 and is equal to or more than the reference value. The control unit 13 may determine whether or not the tilt has occurred. In FIG. 2, the signal output from the inclinometer is indicated by a broken line arrow.

Embodiment 2
The volcano monitoring system according to the second embodiment will be described. FIG. 4 schematically shows the configuration of the volcano monitoring system 2 according to the second embodiment. The volcano monitoring system 2 has a configuration in which the inclinometer 12 of the volcano monitoring system 1 according to the first embodiment is replaced with a gravimeter. In this example, an example in which two gravimeters 22A and 22B (also referred to as first sensors, respectively) are arranged along a muon passage path will be described.

FIG. 5 is a diagram showing an arrangement example of the detector 11, the control unit 13, the analysis unit 14, and the gravimeters 22A and 22B of the volcano monitoring system 2. In the present embodiment, the gravimeters 22A and 22B are arranged so as to be aligned from a high altitude position to a low altitude position on the mountain surface SF. The gravimeters 22A and 22B transmit signals G1 and G2 indicating the detected weight values to the analysis unit 14, respectively.

Hereinafter, the relationship between muography and changes in volcanic density will be described with reference to FIG. In the present embodiment, the density ρ of the mountain body directly under the installation location can be pinpointed by measuring the gravity at the installation location with the gravimeter. Therefore, even when the distance (length) L of the muon passage path is unknown, the inclination described in the first embodiment is used by using the values of the discrete densities ρ of a plurality of locations obtained by the plurality of gravimeters. Muonography Using a Meter The distance (length) L of the muon passage path can be estimated from the obtained density length ρL. That is, by acquiring the local density ρ by the gravimeter, it is possible to estimate the density ρ in detail for each installation location of the gravimeter instead of the average density of the muon passage path.

When the inclinometer and the gravimeter are used in combination, one of the inclinometer and the gravimeter is also referred to as a first sensor, and the other is also referred to as a third sensor.

In addition, by acquiring muography data at two distant timings, it is possible to confirm whether or not the density of the mountain body has changed when the shape of the mountain body has changed. Similar to the first embodiment, first, the first muography data is acquired at the first timing, and then the second muography data is acquired again at the second timing after a certain period of time.

At this time, for example, it is conceivable that the internal structure of the volcano changes due to volcanic activity between the first timing and the second timing, and the density distribution of the mountain body changes. At this time, the value of gravity detected by the gravitational meters 22A and 22B changes according to the change in the mountain body density below the position where the gravitational meters 22A and 22B are installed.

When the gravity measured by the gravimeter at the second timing becomes smaller than the gravity measured by the same gravimeter at the first timing, it can be estimated that the density of the mountain body below the gravimeter has decreased. On the other hand, when the gravity measured by the gravimeter at the second timing is larger than the gravity measured by the same gravimeter at the first timing, the density of the mountain body below the gravimeter has increased. Can be estimated.

As a result, by referring to the fluctuation of the gravity value detected by the gravimeter, the change in the muon flux appearing in the second muonography data acquired by the analysis unit 14 is due to the density change in the muon passage path. It can be determined that it is a thing. Therefore, in the analysis unit 14, the density change on the muon passage path in the monitoring region, that is, the internal structure of the muon changes due to the gravity change below the position where the gravimeter is installed and the fluctuation amount of the muon flux. It becomes possible to detect that.

Further, as in the present embodiment, by providing a plurality of gravimeters (gravimeters 22A and 22B in FIG. 4) on the path through which the muon passes through the mountain body of the volcano 100 to be monitored, the muon passes through the mountain body. It is also possible to estimate the density distribution of mountain bodies in the route. Although the configuration in which two gravimeters are provided has been described here, it goes without saying that one gravimeter may be provided or three or more gravimeters may be provided.

Similar to the first embodiment, in order to capture the state change of the mountain body, it is necessary to acquire the muography data twice at at least two different timings and compare them. Therefore, the second muography data acquisition may be acquired based on the gravity detected by the gravimeters 22A and 22B. FIG. 6 shows a procedure for acquiring the second muography data based on the detection of gravity. When one or both of the gravitational meters 22A and 22B detect a change in gravity equal to or greater than the reference value (step S21 in FIG. 3), the detection result is automatically notified to the control unit 13 (step S22 in FIG. 3). In this case, the control unit 13 controls the detector 11 and the analysis unit 14 in response to the notification from one or both of the gravimeters 22A and 22B to acquire the second muography data (step of FIG. 3). S23) is possible. As a result, it can be expected that the state change of the volcano 100 to be monitored will be detected more reliably.

Here, it has been described that the gravitational meters 22A and 22B notify the control unit that a change in gravity exceeding the reference value has occurred, but the control unit 13 determines the measured value of gravity output from the gravitational meters 22A and 22B. The control unit 13 may monitor and determine whether or not a change in gravity of a reference value or more has occurred. In FIG. 4, the signals output from the gravimeters 22A and 22B are indicated by dashed arrows.

Embodiment 3
The volcano monitoring system according to the third embodiment will be described. In collaboration with inclinometers and gravimeters, we explained the detection of changes in the state of volcanic mountain bodies. For that purpose, it is necessary to acquire and compare the muography data twice at at least two different timings. However, when the second muography data is acquired when the mountain body has not changed, the state change of the mountain body cannot be captured as a matter of course. Therefore, it is desirable that the second muography data be acquired when there is a high probability that the state of the mountain body has changed.

Therefore, in the present embodiment, the volcano monitoring system according to the above-described embodiment detects muography in response to signals from other detectors that detect a phenomenon that causes a change in the state of the mountain body. explain.

FIG. 7 schematically shows the configuration of the volcano monitoring system 3 according to the third embodiment. The volcano monitoring system 3 has a configuration in which the volcano monitoring system 1 according to the first embodiment is combined with a tide level meter 31, a tsunami detection system 32, a seismograph 33, and a crustal movement detection system 34 (each also referred to as a third sensor). Have.

Hereinafter, the control unit 13 of the volcano monitoring system 3 is configured to be able to communicate with the tide level meter 31, the tsunami detection system 32, the seismograph 33, and the crustal movement detection system 34 via a communication means (communication network) including wired or wireless. Will be done.

The tide gauge 31 is installed offshore of the coast near the volcano 100 to be monitored, for example, and transmits a signal indicating the measured tide level to the control unit 13.

The tsunami detection system 32 detects the occurrence of a tsunami offshore using, for example, a tide gauge (which may be the tide gauge 31 described above), and transmits a signal indicating the detection result to the control unit 13.

The seismograph 33 is installed near, for example, the volcano 100 to be monitored, detects a volcanic earthquake, and transmits a signal indicating the detection result to the control unit 13.

The crustal movement detection system 34 is configured to detect crustal movement in the laid area by laying an electric cable or an optical fiber cable around the volcano 100 to be monitored and monitoring a signal conducting the cable, for example. NS. When the crustal movement detection system 34 detects a crustal movement equal to or higher than a predetermined reference value, it transmits a signal indicating the detection result to the control unit 13.

When the control unit 13 receives a signal from at least one of the tide level meter 31, the tsunami detection system 32, the seismograph 33, and the crustal movement detection system 34, the control unit 13 acquires muography data as in the first embodiment. Then, the acquired muography data is used as the second muography data acquired at the second timing, and compared with the first muography data at the first timing acquired before, the state of the mountain body is compared. Detect changes.

The advantages of collaboration with other detectors will be described below. When a change in the tide level larger than the reference value is observed at the position where the tide gauge 31 is installed, it can be estimated that a submarine earthquake or crustal movement that causes the change in the tide level has occurred in the vicinity. In this case, a submarine earthquake or crustal movement may affect the condition of the volcano 100 to be monitored. Therefore, by notifying the control unit 13 that the tide level has changed significantly, it is possible to acquire the muography data at a timing when there is a high possibility that the state of the mountain body has changed.

When the tsunami detection system 32 detects the occurrence of a tsunami offshore, it can be estimated that the tsunami is due to a submarine earthquake that occurred offshore. In this case, the submarine earthquake may affect the condition of the mountain body of the volcano 100 to be monitored. Therefore, by notifying the control unit 13 that a tsunami has occurred, it becomes possible to acquire muography data at a timing when there is a high possibility that a change has occurred in the state of the mountain body.

Further, when the seismograph 33 detects the occurrence of an earthquake in the vicinity of the volcano 100 to be monitored, the earthquake may affect the state of the mountain body of the volcano 100 to be monitored. Therefore, by notifying the control unit 13 that an earthquake has occurred, it becomes possible to acquire muography data at a timing when there is a high possibility that a change has occurred in the state of the mountain body.

Furthermore, when the crustal movement detection system 34 detects crustal movement in the vicinity of the volcano 100 to be monitored, the crustal movement may affect the state of the mountain body of the volcano 100 to be monitored. Therefore, by notifying the control unit 13 that the crustal movement has occurred, it is possible to acquire the muography data at the timing when there is a high possibility that the state of the mountain body has changed.

In the case of fiber sensing, the optical fiber itself functions as a sensor, so for example, by orbiting the optical fiber more than once so as to surround the foot of the volcano 100 to be monitored, it is possible to realize a sensor arrangement similar to CT scan in the human body. can. In this case, when volcanic tremors occur, seismic reflected waves can be observed from the stratum boundary inside the mountain body inside the optical fiber, so tomography of the stratum state becomes possible. By combining this tomography information with the information on the density length ρL of the mountain body acquired by muography, the detailed density distribution inside the mountain body can be reconstructed.

As described above, according to this configuration, by using other detectors such as the tide level meter 31, the tsunami detection system 32, the seismograph 33, and the crustal movement detection system 34, the state of the mountain body of the volcano 100 to be monitored is affected. It is possible to acquire muography data when a highly probable event occurs. As a result, it can be expected that the state change of the volcano 100 to be monitored will be detected more reliably.

Other Embodiments The present invention is not limited to the above embodiments, and can be appropriately modified without departing from the spirit. For example, the volcano monitoring method according to the above-described embodiment is the same as the operation of the above-mentioned volcano monitoring system, and thus a duplicate description will be omitted. Needless to say, the change of state of the volcano can be easily detected by the volcano monitoring method according to the present embodiment.

The inclinometer according to the first embodiment and the gravimeter according to the second embodiment may be provided not only on one side but also on both sides.

In the third embodiment, the tide gauge, the tsunami detection system, the seismometer, and the crustal movement detection system are mentioned as the third sensor, but these are merely examples. As the third sensor, another sensor that detects an event that affects the state of the volcanic mountain body to be monitored may be used.

In the third embodiment, the tide level gauge, the tsunami detection system, the seismometer, and the crustal movement detection system are added to the volcano monitoring system according to the first embodiment, but the tide level is added to the volcano monitoring system according to the second embodiment. A meter, a tsunami detection system, a seismometer, and a crustal movement detection system may be added. Needless to say, the tide gauge, the tsunami detection system, the seismograph, and the crustal movement detection system do not all need to be added, and only one or a part of them may be added.

Although the present invention has been described above in accordance with the above-described embodiment, the present invention is not limited to the configuration of the above-described embodiment, and is within the scope of the claimed invention within the scope of the claims of the present application. Of course, it includes various modifications, modifications, and combinations that can be made by a person skilled in the art.

1-3 Volcano monitoring system
10 Observation facility 11 Detector 12 Tiltmeter 13 Control unit 14 Analysis unit 22A, 22B Gravity meter 31 Tide meter 32 Tsunami detection system 33 Seismometer 34 Crustal movement detection system 100 Volcano to be monitored CON1, CON2 Control signal DET detection signal

Claims (10)

A detector that can detect muons that have passed through the mountain body of the volcano to be monitored,
A control unit that controls the directivity direction of muon detection of the detector,
A first sensor that detects the state of the volcano's mountain body to be monitored and outputs the detection result,
Muonography data is obtained based on the muon flux detected by the detector, the directivity direction of the detector when the muon flux is detected, and the detection result by the first sensor. Equipped with an analysis unit to acquire
Volcano monitoring system. The first sensor is an inclinometer that detects the inclination of the surface of the volcano to be monitored.
The analysis unit estimates the distance that the muon has passed through the mountain body of the volcano to be monitored by using the amount of inclination detected by the inclinometer.
The volcano monitoring system according to claim 1. The analysis unit acquires muography data when the inclination detected by the inclinometer becomes larger than the reference value.
The volcano monitoring system according to claim 2. The first sensor is a gravimeter installed on the surface of the mountain body of the volcano to be monitored and detects the gravity at the installed position.
The analysis unit estimates the change in the density of the mountain body of the path through which the muon has passed, based on the value of gravity detected by the gravity.
The volcano monitoring system according to claim 1. The analysis unit acquires muography data when the gravity detected by the gravimeter changes from a reference value.
The volcano monitoring system according to claim 4. Further equipped with a second sensor that detects the state of the volcanic mountain body to be monitored and outputs the detection result.
The second sensor is a gravimeter installed on the surface of the mountain body of the volcano to be monitored and detects the gravity at the installed position.
The analysis unit estimates the change in the density of the mountain body of the path through which the muon has passed, based on the value of gravity detected by the gravity.
The volcano monitoring system according to any one of claims 1 to 3. The analysis unit acquires muography data when the gravity detected by the gravimeter changes from a reference value.
The volcano monitoring system according to claim 6. It is equipped with a third sensor that detects events that affect the condition of the volcanic mountain body to be monitored.
When the third sensor detects the occurrence of the event, the analysis unit acquires the muography data.
The volcano monitoring system according to any one of claims 1 to 7. The third sensor includes a tide gauge that detects the sea tide level, a tsunami detection system that detects the occurrence of a tsunami, a seismometer that detects the occurrence of an earthquake, and a crustal movement that detects crustal movements near the volcano to be monitored. One of the fluctuation detection systems,
The volcano monitoring system according to claim 8. Controls the directivity direction of muon detection by a detector that can detect muons that have passed through the mountain body of the volcano to be monitored.
Detecting the condition of the volcano of the volcano to be monitored,
Muonography data based on the muon flux detected by the detector, the directivity direction of the detector when the muon flux is detected, and the state of the detected volcanic mountain body to be monitored. To get,
Volcano monitoring method.

Images