CN112764089A - Earthquake precursor monitoring system - Google Patents
Earthquake precursor monitoring system Download PDFInfo
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- CN112764089A CN112764089A CN202011604155.8A CN202011604155A CN112764089A CN 112764089 A CN112764089 A CN 112764089A CN 202011604155 A CN202011604155 A CN 202011604155A CN 112764089 A CN112764089 A CN 112764089A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 239000002243 precursor Substances 0.000 title claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 229910052734 helium Inorganic materials 0.000 claims abstract description 29
- 239000001307 helium Substances 0.000 claims abstract description 29
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000012530 fluid Substances 0.000 claims abstract description 17
- 230000009471 action Effects 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 66
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000005192 partition Methods 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 3
- 239000003673 groundwater Substances 0.000 abstract description 23
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000007667 floating Methods 0.000 description 4
- 229910052704 radon Inorganic materials 0.000 description 4
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 235000013547 stew Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/01—Measuring or predicting earthquakes
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
A monitoring system for earthquake precursor comprises a bubble separation device, and a constant flow device, an air pump and an air analyzer which are respectively connected with the bubble separation device, wherein the constant flow device conveys the drawn underground water to the bubble separation device at a constant liquid flow rate, the air pump conveys the ground water to the bubble separation device at a constant air flow rate, the bubble separation device mixes air and fluid at a constant ratio, separates helium in the fluid, and conveys the helium to the air analyzer for analyzing the helium content under the action of an air suction pump. The invention realizes the prediction before earthquake by monitoring helium, realizes the reliable measurement of the monitoring value by constant air flow ratio, and avoids the interference of helium in the air, thereby leading the prediction value to be more scientific.
Description
Technical Field
The invention relates to the field of earthquake monitoring, in particular to an earthquake precursor monitoring system.
Background
Earthquake is a frequent natural disaster in China, and relates to wide geographical range and great harm, so that various methods for monitoring abnormal phenomena occurring before earthquake precursor, namely earthquake, become important contents and hotspots of earthquake research. Research has shown that underground fluids such as ground water (well water, spring water, water contained in subterranean formations), oil and gas, and other gases may be stored in underground rock formations, and the chemical composition and certain physical quantities of these underground fluids are monitored by instruments, and the study of their changes can help people predict earthquakes. Helium is a noble gas that can migrate further away in good channel conditions, and can permeate along the formation zone with the fluid, migrating vertically from deep to the surface. When a earthquake occurs, the flow of helium from the underground grows as the dynamic load of the rock increases, and these properties of helium itself determine that it can be one of the sensitive components that reflect the indication of the earthquake precursor.
Most of the prior art are based on radon monitoring to predict earthquake, but compared with radon, helium has chemical inertness and strong diffusion capacity 7.4 times of radon, so that the helium is more suitable for earthquake monitoring, and the prior art adopts a bubbling device to generate bubbles to separate out helium contained in underground water, but the detection result is influenced because the air also contains a small amount of helium; and after bubbling in the prior art, the generated bubbles can not completely float to the liquid level and break, especially the bubbles with small volume have large surface stress and are difficult to break, so that helium can not be released, and detection data has errors.
Disclosure of Invention
In light of the problems raised by the background, the present invention provides an earthquake precursor monitoring system, which is further described below.
A monitoring system for earthquake precursors comprises a bubble separation device, a separation cylinder, a gas-liquid separation chamber and a gas-liquid separation chamber, wherein the bottom of the separation cylinder is provided with a liquid inlet, the side part of the separation cylinder is provided with a liquid outlet, and the inner part of the separation cylinder is provided with an inner cylinder connected with the liquid inlet; an air storage cylinder fixedly connected to the separating cylinder is arranged between the inner cylinder and the separating cylinder, the upper part of the air storage cylinder is exposed out of the separating cylinder, a gap is reserved between the lower part of the air storage cylinder and the separating cylinder, the air storage cylinder is partially exposed out of the separating cylinder, an air guide pipe is arranged in the air storage cylinder, the bottom of the air guide pipe extends downwards into the inner cylinder, and a bubbler is arranged at the bottom of the air guide pipe; the constant flow device is connected with the liquid inlet and is used for conveying the sucked underground water to the bubble separation device at a constant liquid flow rate; the air pump is used for conveying the air to the bubble separation device at a constant air flow rate; the gas analyzer is connected with the gas storage cylinder exposed out of the separation cylinder; the bubble separation device mixes gas and fluid at a constant ratio and transmits the gas and fluid to a gas analyzer for analyzing the content of helium.
Preferably, the gas blown by the gas pump is nitrogen, so that the cost is low, the gas is difficult to dissolve in water, and the monitoring result is not influenced.
Preferably, a gas flow meter is arranged on the gas flow pipeline from the gas pump to the separation cylinder, a venturi tube is arranged on the water flow pipeline connected with the separation cylinder by the constant flow device, a liquid flow meter is arranged at the necking part of the venturi tube, and the flow output of the gas pump and/or the constant flow device is controlled through the numerical display of the gas flow meter and the liquid flow meter.
Preferably, the distance between the lower part of the inner cylinder and the separating cylinder is 1/5-1/3 of the height of the inner cylinder; the sufficient floating time of bubbles is ensured, and the flow velocity of the fluid is stable.
Preferably, when the gas cylinder pumps the released gas to the gas analyzer through the air pump, the air pressure of the gas cylinder is maintained in a micro-negative pressure state; so that the bubbles float upwards in the inner cylinder, overflow from the inner cylinder to the air storage cylinder and are rapidly expanded and broken by micro negative pressure in the surface of the air storage cylinder, and helium is fully collected.
Optionally, the constant flow device comprises a water pump and a constant flow valve connected with the water pump, and the constant flow valve is used for inputting a constant flow of underground water to the bubble separation device
Preferably, the constant-current device comprises a box body, two partition plates are arranged in the box body, the bottoms and two sides of the partition plates are fixedly connected with the box body, the top of the partition plates is lower than the height of the box body, and the box body is divided into three chambers, namely a water inlet chamber, a standing chamber and an outflow chamber; a flow inlet is formed in the side wall of the water inlet cavity, the bottom of the standing cavity is connected to a liquid inlet of the bubble separation device through a pipeline, a flow outlet is formed in the bottom of the flow outlet cavity, the flow inlet is connected with a water pump, and the liquid level of the standing cavity is higher than that of the inner cylinder; the liquid level difference between the constant flow device and the bubble separation device is kept constant, so that the flow entering the bubble separation device is constant.
Preferably, the top of the box body is provided with a cover plate, the cover plate and the box body form a sealed space, the sealed space is pre-filled with nitrogen, the top of the cover plate is provided with an air bag communicated with the sealed space, and the air bag has contractibility; on one hand, in the process that the underground water gradually overflows to the standing cavity, the entrained gas floats upwards and is separated from the underground water fluid, so that a pipe section from the standing cavity to the bubble separation device is always a filled water column, and is divided into three chambers through the partition boards, so that the liquid level of the standing cavity is constant, and the constant control of the flow is maintained; on the other hand, the filling of the nitrogen isolates the interference of air, so that the monitoring result is more scientific. The setting of gasbag makes the water pump can pump groundwater into the box smoothly, and has reduced the influence of box internal gas pressure as far as possible, and atmospheric pressure is compared in hydraulic pressure and can be ignored or can get rid of the atmospheric pressure value in advance through the liquid level height of adjustment chamber of stewing, does not influence the ratio of air current and liquid stream invariable.
Preferably, a filter screen is further arranged in the water inlet cavity, the height of the filter screen is larger than that of the partition plate, and underground water is filtered in the water inlet cavity in advance before entering the standing cavity and the outflow cavity to filter impurities of the underground water.
Has the advantages that: compared with the prior art, the method realizes the prediction before earthquake by monitoring helium, realizes the reliable measurement of the monitoring value by constant air flow ratio, and avoids the interference of helium in the air, so that the prediction value is more scientific.
Drawings
FIG. 1: the invention has a structure schematic diagram;
FIG. 2: the structure schematic diagram of the bubble separation device;
FIG. 3: the structure schematic diagram of the constant current device;
in the figure:
the device comprises a bubble separation device 10, a separation cylinder 11, a liquid inlet 12, an inner cylinder 13, a separation cavity 14, an air cylinder 15, an air duct 16, a bubbler 17 and a liquid outlet 18;
the constant flow device 20, the box body 21, the partition plate 22, the water inlet cavity 23, the standing cavity 24, the outflow cavity 25, the water inlet 26, the outflow 27, the cover plate 28, the air bag 29 and the filter screen 210;
a gas pump 30 and a gas analyzer 40.
Detailed Description
A specific embodiment of the present invention will be described in detail with reference to fig. 1-3.
A seismic precursor monitoring system comprises a bubble separation device 10, and a constant flow device 20, an air pump 30 and a gas analyzer 40 which are respectively connected with the bubble separation device, wherein the constant flow device 20 conveys drawn underground water to the bubble separation device 10 at a constant liquid flow rate, the air pump 30 also conveys the ground water to the bubble separation device 10 at a constant gas flow rate, the bubble separation device 10 mixes gas and fluid at a constant ratio, separates helium in the fluid, and conveys the mixture to the gas analyzer 40 under the action of an air suction pump for analyzing the content of the helium.
The bubble separation device 10 comprises a separation cylinder 11, the bottom of the separation cylinder 11 is provided with a liquid inlet 12, the side part of the separation cylinder is provided with a liquid outlet 18, the liquid inlet 12 is connected with a constant flow device 20, an inner cylinder 13 connected with the liquid inlet 12 is arranged in the separation cylinder 11, and a gas-liquid separation cavity 14 is arranged in the inner cylinder 13; an air storage cylinder 15 fixedly connected to the separation cylinder 11 is arranged between the inner cylinder 13 and the separation cylinder 11, the upper portion of the air storage cylinder 15 is exposed out of the separation cylinder 11, an interval is formed between the lower portion of the air storage cylinder 15 and the separation cylinder 11, the portion, exposed out of the separation cylinder 11, of the air storage cylinder 15 is connected to a gas analyzer 40 through an air suction pump, an air guide pipe 16 is arranged in the air storage cylinder 15, the bottom of the air guide pipe 16 extends downwards into the inner cylinder 13, and a bubbler 17 is arranged at the bottom of the.
The underground water from the constant flow device 20 enters a gas-liquid separation cavity 14 of the inner cylinder 13 from a liquid inlet 12 arranged at the bottom of the separation cylinder 11 and overflows into the gas storage cylinder 15 from the top, and finally, the underground water flows out from a liquid outlet 18 on the separation cylinder 11 according to the principle of a communicating vessel because the lower part of the inner cylinder 13 is separated from the separation cylinder 11; the bubbler 17 is positioned in the inner cylinder 13, and the gas delivered by the gas pump 30 generates a large amount of bubbles after passing through the bubbler 17 immersed in the groundwater, so that the helium gas entrapped in the groundwater is stripped from the groundwater and accumulated upwards, and is delivered to the gas analyzer 40 under the action of the air pump for analyzing the helium content.
It should be noted that the gas blown into the groundwater is not necessarily helium, and the air contains helium with a certain concentration, so the blown gas cannot be air, and the bubbles should be generated efficiently to ensure that the helium is stripped off completely, and therefore, the gas blown into the gas pump 30 of the present invention is preferably nitrogen which is low in cost and is difficult to dissolve in water.
In the monitoring process, for the obtained detection value to be scientific and reliable, the detection value should be stable, so that the ratio of the air blowing amount to the water inflow amount entering the bubble separation device 10 is required to be constant, that is, the flow rate of the gas blown by the air pump 30 and the liquid input by the constant flow device 20 is required to be constant, in practice, the power of the air pump 30 is controlled to be constant, that is, the flow rate of the gas can be constant, in this embodiment, the flow rate of the gas flow and the flow rate of the water flow are monitored in real time, a gas flow meter is arranged on a gas flow pipeline from the air pump 30 to the separation cylinder 11, meanwhile, a venturi tube is arranged on a water flow pipeline connected to the separation cylinder 11 by the constant flow device 20, a liquid flow meter is arranged at the necking position of the venturi tube to accurately obtain the fluid of the groundwater.
The bubbles generated in the inner cylinder 13 gradually float upwards and enter the air storage cylinder 15, the gas is accumulated at the upper part of the air storage cylinder 15, the separated underground water enters the separation cylinder 11 from the air storage cylinder 15, and in order to ensure that all helium is collected, the underground water fluid flows through the lower part of the inner cylinder 13 and the separation cylinder 11 before flowing through the gap, wherein the wrapped bubbles need to have sufficient floating time.
In the generation process of the bubbles, the sizes of the bubbles have certain randomness, the bubbles with larger volume are broken due to the gradual increase of the volume caused by the reduction of the liquid pressure in the floating process or float to the liquid level to be broken to release the internal gas, and for a large amount of bubbles with smaller volume, especially bubbles with small volume, the surface stress is stable and is not easy to break, the buoyancy borne by the bubbles is not enough to overcome the thrust generated by the flow of the underground water, and the bubbles flow out of the separation cylinder 11 along with the flow of the underground water, so that the monitoring result has errors.
Based on this, when the gas released by the air pump is pumped to the gas analyzer 40, the air pressure of the air cylinder 15 is maintained in a micro-negative pressure state, so that the bubbles are quickly expanded and broken by the micro-negative pressure in the process of overflowing from the inner cylinder 13 to the air cylinder 15 after floating to the surface of the liquid surface in the inner cylinder 13 and in the surface of the air cylinder 15, and radon is fully collected.
In a worse embodiment, the constant flow device 20 includes a water pump and a constant flow valve connected to the water pump, a constant flow of groundwater is input to the bubble separation device 10 through the action of the constant flow valve, in practice, the water pump pumps the groundwater in such a way that the groundwater will entrain a certain amount of gas and the gas will be partially vaporized when the fluid impacts the blades of the water pump, so that the fluid inevitably contains part of the gas, and there is an error in controlling the constant flow of groundwater, based on this, the constant flow device 20 performs a gas standing separation operation on the groundwater in advance, so that the groundwater flowing into the bubble separation device 10 does not contain the gas, and the specific scheme is as follows:
constant current device 20 includes box 21, is equipped with two baffles 22 in the box 21, baffle 22 bottom and both sides and box 21 fixed connection, and the top is less than the height of box 21, with separating into intake antrum 23 in the box 21, the chamber 24 that stews, the three cavity in the chamber 25 that outflows, lie in the intake antrum 23 lateral wall and be equipped with inlet 26, the chamber 24 bottom of stewing is through pipe connection to bubble separator 10's inlet 12, the chamber 25 bottom of effluenting is provided with outflow 27, inlet 26 connects the water pump. When the starting is started, the water pump pumps the groundwater into the water inlet cavity 23, the groundwater overflows the partition plate 22 and enters the standing cavity 24 along with the rising of the groundwater in the water inlet cavity 23, the standing cavity 24 is gradually filled with the groundwater, overflows another partition plate and enters the water outlet cavity 25, the groundwater flows out of the constant flow device 20 from the water outlet 27, the liquid level of the standing cavity 24 is higher than the height of the inner cylinder 13 according to the principle of a communicating vessel, and the bubble separation device 10 is started.
The constant flow device 20 is a sealing structure, and it can be known from the above generation that the content of helium in the air has an influence on the structure, so in this embodiment, a cover plate 28 made of transparent acrylic material is disposed on the top of the box 21, the cover plate 28 and the box 21 form a sealed space, and is pre-filled with nitrogen, an air bag 29 communicated with the sealed space is disposed on the top of the cover plate 28, the air bag 29 has contractibility, and when pumping groundwater into the box 21, the nitrogen in the box 21 is extruded to the air bag 29 until the groundwater overflows to the outflow cavity 25, so that the air bag 29 expands to store the nitrogen. On one hand, in the process that the underground water gradually overflows to the standing cavity 24, the entrained gas floats upwards and is separated from the underground water fluid, so that the pipe section from the standing cavity 24 to the bubble separation device 10 is always a filled water column, and is divided into three chambers through partition plates, so that the liquid level of the standing cavity 24 is constant, and the constant control of the flow is maintained; on the other hand, the filling of the nitrogen isolates the interference of air, so that the monitoring result is more scientific. The arrangement of the air bag 29 enables the water pump to smoothly pump underground water into the box body 21, the influence of air pressure in the box body 21 is reduced as far as possible, the air pressure is negligible compared with hydraulic pressure or the air pressure value can be eliminated in advance by adjusting the liquid level height of the standing cavity 24, and the constant ratio of air flow to liquid flow is not influenced.
Further, a filter screen 210 is further arranged in the water inlet cavity 23, the height of the filter screen 210 is larger than that of the partition plate 22, and groundwater is filtered in the water inlet cavity 23 in advance before entering the standing cavity 24 and the outflow cavity 25 to filter impurities.
The invention realizes the prediction before earthquake by monitoring helium, realizes the reliable measurement of the monitoring value by constant air flow ratio, and avoids the interference of helium in the air, thereby leading the prediction value to be more scientific.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An earthquake precursor monitoring system, comprising:
the bubble separation device (10) comprises a separation cylinder (11), wherein a liquid inlet (12) is formed in the bottom of the separation cylinder (11), a liquid outlet (18) is formed in the side part of the separation cylinder, an inner cylinder (13) connected with the liquid inlet (12) is arranged inside the separation cylinder, and a gas-liquid separation cavity (14) is formed inside the inner cylinder (13); an air storage cylinder (15) fixedly connected to the separating cylinder (11) is arranged between the inner cylinder (13) and the separating cylinder (11), the upper part of the air storage cylinder (15) is exposed out of the separating cylinder (11), the lower part of the air storage cylinder is spaced from the separating cylinder (11), part of the air storage cylinder (15) is exposed out of the separating cylinder (11), an air guide pipe (16) is arranged in the air storage cylinder (15), the bottom of the air guide pipe (16) extends downwards into the inner cylinder (13), and a bubbler (17) is arranged at the bottom of the air guide pipe;
the constant flow device (20) is connected with the liquid inlet (12) and is used for conveying the sucked underground water to the bubble separation device (10) at a constant liquid flow rate;
a gas pump (30) that delivers a constant gas flow rate to the bubble separation device (10);
the gas analyzer (40) is connected with the gas storage cylinder (15) exposed out of the separation cylinder (11);
the bubble separation device (10) mixes gas and fluid at a constant ratio and sends the mixture to a gas analyzer (40) to analyze the helium content.
2. The seismic precursor monitoring system of claim 1, wherein: the gas blown by the air pump (30) is nitrogen.
3. The seismic precursor monitoring system of claim 2, wherein: and a gas flow meter is arranged on the gas flow pipeline from the air pump (30) to the separation cylinder (11), a venturi tube is arranged on the water flow pipeline connected with the separation cylinder (11) through the constant-current device (20), a liquid flow meter is arranged at the necking part of the venturi tube, and the flow output of the air pump (30) and/or the constant-current device (20) is controlled through the numerical display of the gas flow meter and the liquid flow meter.
4. The seismic precursor monitoring system of claim 3, wherein: the distance between the lower part of the inner cylinder (13) and the separating cylinder (11) is 1/5-1/3 of the height of the inner cylinder (13).
5. The seismic precursor monitoring system of claim 4, wherein: the gas cylinder (15) pumps the released gas to the gas analyzer (40) through the air pump, and the interior of the gas cylinder (15) is maintained in a micro-negative pressure state.
6. The seismic precursor monitoring system of any one of claims 1-5, wherein: the constant flow device (20) comprises a water pump and a constant flow valve connected with the water pump, and underground water with constant flow is input into the bubble separation device (10) under the action of the constant flow valve.
7. The seismic precursor monitoring system of any one of claims 1-5, wherein: the constant-current device (20) comprises a box body (21), two partition plates (22) are arranged in the box body (21), the bottoms and two sides of the partition plates (22) are fixedly connected with the box body (21), the top of the partition plates is lower than the height of the box body (21), and the interior of the box body (21) is divided into three chambers, namely a water inlet chamber (23), a standing chamber (24) and a flow outlet chamber (25); the side wall of the water inlet cavity (23) is provided with a flow inlet (26), the bottom of the standing cavity (24) is connected to a liquid inlet (12) of the bubble separation device (10) through a pipeline, the bottom of the flow outlet cavity (25) is provided with a flow outlet (27), the flow inlet (26) is connected with a water pump, and the liquid level of the standing cavity (24) is higher than that of the inner cylinder (13).
8. The seismic precursor monitoring system of claim 7, wherein: the top of the box body (21) is provided with a cover plate (28), the cover plate (28) and the box body (21) form a sealed space, the sealed space is pre-filled with nitrogen, the top of the cover plate (28) is provided with an air bag (29) communicated with the sealed space, and the air bag (29) has contractibility.
9. The seismic precursor monitoring system of claim 8, wherein: a filter screen (210) is further arranged in the water inlet cavity (23), and the height of the filter screen (210) is larger than that of the partition plate (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011604155.8A CN112764089A (en) | 2020-12-29 | 2020-12-29 | Earthquake precursor monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011604155.8A CN112764089A (en) | 2020-12-29 | 2020-12-29 | Earthquake precursor monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112764089A true CN112764089A (en) | 2021-05-07 |
Family
ID=75697328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011604155.8A Withdrawn CN112764089A (en) | 2020-12-29 | 2020-12-29 | Earthquake precursor monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112764089A (en) |
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2020
- 2020-12-29 CN CN202011604155.8A patent/CN112764089A/en not_active Withdrawn
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Application publication date: 20210507 |
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