KR100952657B1 - Measuring system and method of radon gas for earthquake prediction - Google Patents

Abstract

PURPOSE: A radon gas system for measuring for the earthquake forecasting and method accurately grasps the underground radon amount change by being directly proceeds the radon analysis in the underground water surface to the integration type radon density measuring device. CONSTITUTION: An integration type radon density measuring device(200) installs to the lower part of the packer(10). The hose(30) is connected to the top of packer. The air pump(40) is connected to the other side of the hose connected to packer. The air pump distends the volume of packer by injecting the air into packer. The air pump contracts the volume of packer by inhaling the air of packer. Packer is arranged from the underground water surface of the bore hole(102) in the top. The outer circumference of packer is touched with the inner circumference of the bore hole by injecting the air through the air pump and hose. The integration type radon density measuring device measures the radon gas.

Description

Measuring system and method of Radon gas for earthquake prediction

The present invention relates to a radon gas measurement system and method for earthquake forecasting.

Some earthquakes on Earth are predictable and some are not. Needless to say, the predicted earthquake is the best way to reduce casualties.

If the earthquake is known in advance, the effect of disaster prevention is great. However, vague earthquake forecasts of earthquakes that occur somewhere with little expectation of time, location, and size are of little help. In a place where the earthquake is repeatedly occurring at intervals of several decades or hundreds of years, when the number of years close to the average interval repeated from the previous earthquake has elapsed, the next earthquake can be warned not so far, but more than that. It is difficult to predict when it will happen in detail.

The precursors of the earthquake include earthquake activity, tectonic disturbances, geomagnetism, groundwater, and abnormal behavior of animals. There are many known examples of abnormalities in any of these items before the earthquake, and when similar problems are recognized, think about whether they are a precursor to an earthquake.

However, even if an item appears abnormal, it cannot be assumed that an earthquake will occur afterwards, and the earthquake may occur when an abnormality is not recognized. Therefore, it is unlikely that a single item will be successful in forecasting. Sensitive observations of many items in other events are carried out at many points, while studies on the occurrence mechanisms of earthquake precursors, perceptual structures, and physical properties of each region are conducted. It is necessary to develop identification of abnormalities. In order for earthquake forecasts to be helpful in disaster prevention, a system must be arranged for him. In other words, it is important to intensively record and observe various kinds of observation data about each place.

Although they continue to invest huge amounts of money for earthquake forecasting, earthquake forecasts are still in the early stages of development.

Globally, examples of earthquake-predicting and reducing damage can be found in China. That is the 1975 earthquake in China. At the time, China predicted the marine earthquake by combining the precursors of earthquakes – groundwater changes, surface changes, forward phenomena, and animal and human behaviors. There was no.

There are several conventional methods of earthquake prediction. Among them, the seismic wave (P wave) speed change observation technique is a method of predicting an earthquake by investigating the speed of the P wave vertically acting underground and the S wave acting horizontally. Under normal conditions, the P wave travels 1.75 times faster than the S wave. However, just before the earthquake, the P wave slows down by 10 to 15 percent as the rock expands and becomes dense. The minute speed differences of the seismic waves can predict the timing, location, and magnitude of the earthquake.

The technology using the Global Positioning Information System (GPS) is also known as the 'GPS' which uses satellites to determine the location information on the earth. Seismic occurrence and movement speed are captured by checking the change of location of each region according to the movement of the tectonic plate.

Groundwater level change technology takes advantage of the fact that the stress increases before the earthquake occurs, causing the rocks to expand and raise the groundwater level.

Measurement of specific resistance and ground current change of rock is based on the measurement of abnormal ridges, tectonic fluctuations, ie expansion, inclination, volume change, etc., where the ground partially rises as the pressure under the ground increases. do.

Before the rock breaks into a single layer, change in electrical conductivity and chemical composition in groundwater due to microcracks generated by pressure are observed. As a result, earthquakes are predicted by phenomena such as changes in rock resistivity, ground current, and electromagnetic radiation.

Unique predictive techniques that appear in animals and the natural world are based on the characteristics of the following items.

* The animal is anxious and refuses to run or vice versa.

* A flock of birds suddenly flies in a circle or flies at high speed.

* All dogs of caution bark day and night.

The rooster climbs to the top of the tree or sits only on the perch of the chicken coop.

* Mosquitoes and flies suddenly disappear from where they usually flock.

* Snake comes out of hibernation and freezes on snow.

Hibernating bears emerge from their nest.

* The cat jumps out of the house.

Fish die on the beach

* Rats stop running in fear.

* Spring and lake water suddenly becomes muddy.

* A loud sound is heard from the ground.

Flowers bloom early in season.

* People feel strangely weak.

* King's Cherry Blossoms on Java Island blossoms the day before the earthquake.

On the other hand, radon measurement technology is a precursor to the occurrence of earthquake, many studies are in progress, it is a method of predicting the radon (Radon) gas emitted based on it.

Radon gas is a substance produced by radioactive decay of radium (Rd). It is a radioactive element caused by radioactive decay of uranium, a decay product of uranium and thorium, and can be naturally generated and collected anywhere in the geological environment (rock, soil, groundwater). .

Radon (Rn) is the daughter element of radium (Rd) (change from the parent element due to radioactive decay), which is formed during the radioactive decay of uranium (U) to ultimately lead to lead (Pb). Therefore, a lot of radon means a lot of uranium.

Basically, because all of the crust contains uranium, it is naturally radioactive and produces radon.

The depths of uranium originally contained in the rock's origins, such as deep magma and deep granite bodies formed by it, remain relatively high, but the amount is minimal on the surface. However, if there are passages that can be directly connected to the core, such as faults, volcanoes, hot spots, and large joints, radon is relatively more affected by uranium than the surroundings.

Earthquakes are caused by these faults or volcanic activity. Therefore, the moment the earthquake occurs is more affected by deeper uranium-rich materials such as magma and hydrothermal water.

For example, if there is a fault, it will basically spill more radon along the gap than elsewhere, and this will lead to more gaps when the underground activity becomes active and the fault begins to move, or the fault associated with the fault. This causes more of the magma, hot water, or daughter elements of uranium originally contained in the deeper rocks to be released to the surface.

 Therefore, while installing and monitoring a radon measuring device around a volcano or active fault zone, suddenly increasing radon emission can detect the activity of the underground, and make an earthquake forecast and volcanic eruption forecast.

Of course, if the time interval between earthquakes and volcanic activity occurs from that moment is too short, its effectiveness will decline, but if you monitor it for a long time, you can know the prognosis. Often used in one place.

However, this radon measurement technique is relatively easy to observe because it is different from normal days or weeks before the earthquake is imminent. Therefore, the groundwater is periodically collected to measure radon gas content in the groundwater. The problem occurs because That is, conventionally, groundwater samples were taken from the groundwater taps in the earthquake predicted areas. Therefore, it is difficult to obtain accurate data by extracting the degassed state as it approaches the surface rather than underground information, because it is difficult to accurately measure the radon content of the groundwater in situ at the borehole.

The present invention has been made to solve the above problems, an object of the present invention is to monitor the radon gas at all times directly from the borehole, instead of quantitatively analyzing the radon gas content contained in the groundwater by collecting ground water that has been conventionally performed It is to provide a radon gas concentration measuring system and method according to the present invention to obtain a more accurate and accurate radon gas concentration data value by solving the problem that radon gas is degassed in the groundwater sampling process by measuring radon gas.

An object of the present invention as described above, in the system for measuring the radon gas concentration from the groundwater of the borehole drilled in the region where the earthquake is expected for earthquake prediction, the time-integrated radon concentration meter is mounted on the bottom, and the shrinkage / expansion Possible packers; A hose connected to an upper portion of the packer; And an air pump connected to the other side of the hose connected to the packer to inject or suck air into the packer to contract / expand the packer's volume. The packer is disposed above the groundwater surface of the borehole and is provided with an air pump. Air is injected through the hose to expand the outer circumference of the packer to be interviewed with the inner circumferential surface of the borehole to seal the space between the water table and the packer, and then measure radon gas with a time-integrated radon concentration meter. Achieved by a radon gas measurement system, or

A method of measuring radon gas concentration from groundwater of a borehole drilled in an expected earthquake region for earthquake forecasting, wherein the groundwater level and groundwater level are measured inside the borehole, and a time-integrated radon concentration meter is mounted below Disposing the packer at a spaced distance from the groundwater surface; Expanding the outer circumferential surface of the packer to be in contact with the inner circumferential surface of the borehole to seal a space between the groundwater surface and the packer; It is achieved by the radon gas measurement method for the earthquake forecast characterized in that it comprises a step of measuring the radon gas concentration in the enclosed space.

According to the radon gas measuring method and system for earthquake forecasting according to the present invention, since radon in the borehole is in chemical equilibrium after 3 to 4 hours, the radon content of the borehole can be monitored every day (24 hours).

In addition, it is possible to more accurately grasp the change in the amount of underground radon by analyzing the radon by alpha track with a time-integrated radon concentration meter directly above the ground surface rather than analyzing radon by collecting groundwater.

In addition, the cost of investigating the radon content of the borehole becomes very low, and by lowering the automatic water level gauge before the packer is lowered, it is possible to predict the earthquake through these data by comparing the automatic water level measurement with the radon content.

The present invention is a system for measuring the radon gas concentration from the groundwater of the borehole drilled in the region where the earthquake is expected for earthquake forecasting, a packer capable of shrinking / expanding the time-integrated radon concentration meter mounted on the bottom and A hose connected to the upper part, and an air pump connected to the other side of the hose connected to the packer to inject or suck air into the packer to contract / expand the packer's volume,

The packer is disposed above the groundwater surface of the borehole and injected with air through an air pump and hose to expand the outer circumferential surface of the packer to be interviewed with the inner circumferential surface of the borehole to seal the space between the groundwater surface and the packer, and then integrate the timed radon. Radon gas is measured by the concentration meter.

Here, the packer is preferably configured to have a diameter larger than the diameter of the borehole when the expansion due to the air pump so that the outer circumferential surface is in contact with the inner circumferential surface of the borehole, as shown in Figure 1, one side of the hose is the upper portion of the borehole It is preferable to further include a cover for covering the inside of the borehole by covering, and further comprising a valve on the hose side connected to the air pump.

On the other hand, the present invention as another category in the method for measuring the radon gas concentration from the groundwater of the borehole drilled in the region where the earthquake is expected for earthquake forecasting, the groundwater level inside the borehole and the groundwater level is measured, Disposing a packer equipped with an integrated radon concentration meter at a spaced distance from the ground surface, expanding the outer circumferential surface of the packer to be interviewed with the inner circumferential surface of the borehole, and sealing a space between the groundwater surface and the packer; It comprises a step of measuring the radon gas concentration in the sealed space, wherein before the step of measuring the radon gas concentration in the sealed space preferably further comprises the step of covering the top of the borehole, the closed The space is preferably 0.5m to 2.0m.

Hereinafter, each configuration of the present invention will be described in detail with reference to the accompanying drawings.

The present invention utilizes a borehole 102 drilled in an earthquake prediction region for an earthquake forecast. The interior of the borehole 102 has a groundwater 103 as shown in Figure 1, such groundwater 103 contains radon gas coming from the crack 101a portion of the crust 101, radon gas is groundwater (103) Is moved to the top of the

In order to measure the concentration of radon gas, the present invention includes a packer 10, a hose 30, an air pump 40, a cover 60, and a time-integrated radon concentration meter 200.

Here, the time-integrated radon concentration measuring device 200 is a device developed by 'Al Tech Co., Ltd.'. Such a time-integrated radon concentration measuring instrument 200 (hereinafter referred to as alpha cup) is described in Korean Application No. 10-2004-0017942, and thus the description thereof will be omitted.

The packer 10 has a configuration capable of contraction / expansion due to the injection and intake of air, and a fixed hook 11 is mounted at the bottom thereof. And the alpha cup is mounted on the fixing hanger 11, as shown in Figures 1 to 4 may be mounted inside the separate transparent cup (22).

The first cup 21 is formed at the upper portion of the transparent cup 22, and the second ring 23 is formed on the upper side of the transparent cup 22. The alpha cup has a second ring 23 located inside the transparent cup 22. ), And the transparent cup 22 is mounted to the fixing hanger 11 mounted to the lower portion of the packer 10. Therefore, the alpha cup is suspended in the lower part of the packer 10.

The air pump 40 is configured to inject or suck air into the packer 10, and is installed on the top of the ground 100 as shown in FIG. 1, and the hose 30 is provided at the top of the packer 10 and the air pump. Connect 40. Thus, the air pump 40 and the hose 30 may cause the packer 10 to contract or expand.

On the other hand, the packer 10 is preferably configured to have a diameter larger than the diameter of the borehole 102 when the expansion due to the air pump 40, which is a closed space (S) as shown in Figure 1 due to the packer 10 This is to secure.

The hose 30 may further include a cover 60 covering the upper portion of the borehole 102 on one side to seal the inside of the borehole 102, which is rainwater to the top of the packer 10 during radon gas measurement. In order to prevent the inflow of foreign matters.

Further, the hose 30 connected to the air pump 40 may further include a valve 50. The air pump 40 has only an air injection function and no air intake function, or is packed by the air pump 40 (packer). 10) is inflated to prevent the air from leaking due to the defect of the air pump (40). That is, the valve 50 is blocked to prevent air leakage when the packer 10 is expanded due to the air pump 40, and is easily collected when the packer 10 is collected for reasons such as collection of an alpha cup. For the purpose of opening the air to the packer 10 can be removed.

On the other hand, the hose 30 is displayed on the scale, the lower side of the packer 10 is equipped with a sensor for sensing the groundwater surface it is preferable to configure the packer 10 so that it can be placed in a desired position away from the groundwater surface, This configuration solves the problem that the alpha cup is introduced into the groundwater 103 and fails to function again.

In addition, the present invention is further equipped with a sensor for measuring the water level of the groundwater 103 to measure the water level and it is preferable to compare the water level measurement value and the radon gas concentration value to ensure the accuracy of the earthquake forecast.

On the other hand, the present invention as another category, provides a method for measuring the radon gas concentration for earthquake forecasting, for this purpose to determine the groundwater level and groundwater level inside the borehole 102, the time-integrated radon concentration meter at the bottom Placing the packer 10 equipped with (200) at a position spaced apart from the ground water surface (S10), and the outer peripheral surface of the packer 10 is expanded so as to be interviewed with the inner peripheral surface of the borehole 102 and the ground water surface and Sealing the space (S) between the packer 10 and the step (S30) of measuring the radon gas concentration in the closed space (S), in addition, the closed space (S) The method further includes a step S21 of covering the upper portion of the borehole 102 before the step S30 of measuring radon gas concentration. And the closed space (S) is preferably 0.5m ~ 2.0m, because the radon gas concentration measurement is made smoothly at this height (L1).

Specifically, using the existing borehole 102 for earthquake-prone areas, first, the groundwater level and the groundwater level are measured by known water level sensors and water surface position sensors. The packer 10 is lowered into the borehole 102 to a point 1 m higher than the next groundwater level. Next, the packer 10 passes through the lake 30 for air injection into the hole drilled in the cover 60, and covers the upper part of the borehole 102 with the cover 60. Next, the lake 30 is connected to the valve 50 and the air pump 40 to inject air into the packer 10 through the air pump 40. Then, the air enters the packer 10 at an upper portion of 1 m from the groundwater surface, and if expanded to some extent, the valve 50 is blocked to prevent the air leakage. Next, the radon gas discharged from the groundwater 103 is maintained in a closed system in which the 1 m space S of the borehole is closed and is left in that state for 24 hours. When the valve 50 is opened after the next 24 hours, the wind of the packer 10 flows out, and becomes in a state of being easily taken out. In the next borehole 102, the alpha cup is lifted and lifted the deflated packer 10 to recover the alpha cup.

After recovery of the Alpha Cup, the groundwater level is measured and the daily change in water level is recorded. The radon content is measured in the recovered alpha cup. A new alpha cup is attached to the packer 10, placed in the borehole 102, and blown out of the air to inflate the packer 10 to create a closed environment and then shut off the valve 50. This state is maintained for 24 hours.

As such, the present invention is not a technique of quantitatively analyzing the content of the groundwater by collecting ground water as in the conventional method, but is a more accurate and accurate radon measurement method that is always monitored directly from the borehole 102, so that the earthquake forecast is more than the conventional technique. It is advantageous to

Although the present invention has been described in connection with the preferred embodiment, those skilled in the art will be able to easily make various changes and modifications without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation, and the true scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent scope are included in the present invention. Should be interpreted as.

1 is a view schematically showing a radon gas measurement system according to the present invention,

2 to 4 is a view showing an example of the use of FIG.

5 is a radon gas measuring method and an earthquake forecasting flowchart using the same according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100: Floor 101: Perception

101a: crack 102: borehole

103: groundwater 200: time-integrated radon concentration meter

10: Packer 11: Fixed Hook

21: first ring 22: transparent cup

23: second ring 30: hose

40: air pump 50: valve

60: cover

Claims (7)

In the system for measuring the radon gas concentration from the groundwater 103 of the borehole 102 drilled in the region where the earthquake is expected for earthquake prediction, A packer 10 having a time-integrated radon concentration meter 200 mounted thereon and capable of shrinking / expanding; A hose 30 connected to an upper portion of the packer 10; And an air pump 40 connected to the other side of the hose 30 connected to the packer 10 to inject or suck air into the packer 10 to contract / expand the volume of the packer 10. The packer 10 is disposed above the groundwater surface of the borehole 102 and air is injected through the air pump 40 and the hose 30 so that the outer circumferential surface of the packer 10 is interviewed with the inner circumferential surface of the borehole 102. Radon gas measurement system for earthquake forecasts, characterized in that to expand the possible to seal the space (S) between the groundwater surface and the packer (10) and then radon gas with the time-integrated radon concentration meter (200). The method of claim 1, The packer 10 is a radon gas measurement system for earthquake forecasts, characterized in that the diameter of the expansion due to the air pump 40 is configured to be larger than the diameter of the borehole (102). The method of claim 1, One side of the hose (30) covers the upper portion of the borehole (102) further comprises a cover (60) for sealing the inside of the borehole (102) radon gas measurement system for earthquake forecasting. The method of claim 1, Radon gas measurement system for earthquake forecasting, characterized in that further comprising a valve (50) on the hose (30) side connected to the air pump (40). In the method for measuring the radon gas concentration from the groundwater 103 of the borehole 102 drilled in the region where the earthquake is expected for earthquake forecasting, Underground water level and measuring the ground water level inside the borehole 102, the step of placing a packer 10 equipped with a time-integrated radon concentration meter 200 in the lower portion at a predetermined distance from the ground surface (S10) )Wow; Expanding the outer circumferential surface of the packer 10 to be in contact with the inner circumferential surface of the borehole 102 to seal the space S between the groundwater surface and the packer 10 (S20); Measuring radon gas concentration in the closed space (S) (S30); Radon gas measurement method for earthquake forecast, characterized in that comprising a. The method of claim 5, Radon gas measurement method for the earthquake forecast further comprising the step (S21) of covering the upper portion of the borehole (102) before the step (S30) of measuring the radon gas concentration in the closed space (S). The method of claim 5, Radon gas measurement method for the earthquake forecast, characterized in that the closed space (S) is 0.5m ~ 2.0m.

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