A bottom-seismic system for seafloor seismograph

Abstract

The invention discloses a bottom-mounted system for a seafloor seismograph, which is used for observing seafloor earthquakes and recording seafloor earthquake wave signals, and belongs to the technical field of seismographs. The device comprises: a seismograph base and a seismometer arranged in the seismograph base, wherein the seismograph base is a column sleeve-shaped structure with a cavity and one end open, and a limiting base coaxial with the seismograph base is fixedly arranged inside the seismograph base, the limiting base is a circular ring structure, and a limiting sphere is movably arranged at one end of the limiting base. The device can automatically fit the seabed, stably improve the signal-to-noise ratio, and effectively solve the problem that the seafloor seismograph is difficult to fit the seabed and has a low signal-to-noise ratio.

Description

Technical Field

[0001] The invention belongs to the technical field of seismographs, and in particular relates to a bottom mounting system for a seafloor seismograph. Background Art

[0002] An ocean bottom seismometer is a device specially designed for monitoring earthquakes at the bottom of the ocean. It can record ocean bottom earthquake activity and help scientists study the structure of the crust and mantle, as well as the dynamic process of plate tectonics. The development and application of ocean bottom seismometers are of great significance for understanding the internal structure of the earth, seismic activity, tsunami warning, and seabed resource exploration. Existing seismometer technology has many drawbacks, such as difficulty in deployment and recovery, poor coupling between the seismometer and the seabed, short service life, and low degree of automation.

[0003] Publication No. US5189642A discloses a method and apparatus for recording acoustic and seismic signals on the seafloor with minimal noise. The seafloor seismic recorder couples a detector to the bottom of the water, stores seismic data, and is retrievable. The device includes a chassis, a ballast ring, an electronic control assembly, a detector assembly, a buoy device, and a leg extension device. The detector assembly is disconnectably connected to a portion of the control assembly housing so that the detector assembly can remain coupled to the seafloor when the control assembly and the chassis are raised a short distance toward the surface. The buoy device allows the ballast ring and the detector assembly to be embedded in the sediment upon impact, and allows the chassis, the detector assembly, and the control assembly to rise to the surface when the ballast ring is released. The leg member can be partially extended to allow the chassis and the control box to rise a short distance toward the surface, thereby isolating the detector box from the control box and the chassis during the recording operation. This patent still has room for improvement.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a bottom-mounted system for seafloor seismic instrument, which is used for seafloor seismic observation and recording of seafloor seismic wave signals. The device can automatically fit the seafloor, stably improve the signal-to-noise ratio, and effectively solve the problem that the seafloor seismic instrument is difficult to fit the seafloor and has a low signal-to-noise ratio.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A bottom-seismometer system comprises a seismometer base and a seismometer arranged in the seismometer base. The seismometer base is a column-shaped structure with a cavity and an opening at one end. A limiting base coaxial with the seismometer base is fixedly arranged inside the seismometer base. The limiting base is a circular ring structure, and a limiting ball is movably arranged at one end of the limiting base.

[0008] According to one embodiment of the present invention, the inner side of the end of the limiting base away from the limiting sphere is gradually tapered inward. A fixed base is movably provided inside the limiting base, and the fixed base is a columnar structure, and the diameter of the column decreases from the middle of the column to the two ends of the column. The fixed base can slide along the inner wall of the limiting base. The limiting sphere is arranged between the fixed base and the seismograph base.

[0009] After the seismograph enters the water, since the seismograph base and its internal limit base are made of metal, they will press down on the fixed base and sink rapidly. When sinking to the seabed, the balance fan blades and other power devices will have a certain buffer to ensure that when the seismograph suddenly slows down or stops, the seismometer inside it will not rush out of the seismograph, and the limit ball inside the seismograph base will give a certain obstruction and friction to the fixed base. When the seismograph falls to the seabed, the obstruction and friction given to the fixed base by the limit ball will cause the fixed base to be slowly pulled downward by the seismometer, reducing the impact of the fixed base and the seismometer on the bottom, achieving the slow downward movement of the seismometer and the continuous downward displacement of the seabed sediments for a period of time until the seismometer is completely released into place, thus solving the problem that the direct fall of the seismometer may cause a gap between the bottom of the seismometer and the seabed sediments to affect signal acquisition, thereby fully contacting the seabed and ensuring the signal-to-noise ratio to the greatest extent.

[0010] According to one embodiment of the present invention, a seismometer is arranged at an axial position of the fixed base, and the seismometer is fixed to the fixed base by threads. The seismometer base has a cover plate at one end of the opening, and a through hole is arranged at the center of the cover plate, and the diameter of the through hole is smaller than the maximum diameter of the fixed base, so as to ensure that the fixed base will not rush out of the seismometer no matter how large the impact force is, and the cover plate is fixed to the seismometer base by threads.

[0011] According to one embodiment of the present invention, a balancing fan blade is arranged in an array on the side of the seismograph base, and the balancing fan blade is fixedly connected to the seismograph base through a plate body, and a protective cover is arranged around the balancing fan blade, and the balancing fan blade is in the same direction as the central axis of the seismograph base. A first fan blade is also arranged on the side of the seismograph base, and the first fan blade is in a different direction from the central axis of the seismograph base. The lowest horizontal point of the first fan blade is higher than the highest horizontal point of the balancing fan blade. A controller is arranged at the bottom of the seismograph base, and the controller is connected to a balancing sensor, and a storage battery is also arranged therein for powering various electronic components.

[0012] First, the balance blade and the first blade can be used as a power device to send the seismometer to the target point, so that the seismometer can land smoothly on the seabed, and the balance blade can also achieve buoyancy, avoiding the conventional seismometer to use the method of detaching from the heavy oil bag to achieve buoyancy, which seriously pollutes the marine environment. Secondly, the measurement results of the seismometer are closely related to whether the seismometer is balanced on the seabed, which can directly affect the signal-to-noise ratio to a large extent. When the seismometer is in a horizontal state, the signal-to-noise ratio is the highest and the measurement results are the most accurate; on the contrary, when the seismometer is in a tilted state, the signal-to-noise ratio is reduced, and the measurement results will have errors.

[0013] When the seismometer falls on the seabed, the rotation of the balance blades will blow away the seabed sand below the balance blades, allowing the seismometer to adjust its position. The blown away sand will also cover the protective cover on the surface of the balance blades, blocking the impact of water flow and fixing the position of the seismometer. The protective cover can also further ensure that the balance blades will not be stuck by the seabed sand during their rotation on the seabed.

[0014] Furthermore, the balance sensor in the seismograph will sense the position of the seismograph and feed back the result to the controller in real time. The controller will control the balance fan blades in the relative position to rotate, blow away the mud and sand under the corresponding position, and finally put the seismograph in a balanced state. At the same time, it cooperates with the limit components inside the seismograph to keep the seismometer in the best working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the seismograph scheme of the present invention;

[0017] Figure 2 It is a schematic diagram of the released state scheme of the seismometer of the present invention;

[0018] Figure 3 This is a schematic diagram of the contraction state of the seismometer of the present invention;

[0019] Figure 4 It is a schematic diagram of the connection scheme between the seismometer and the fixed base of the present invention;

[0020] Figure 5 It is a schematic diagram of the connection scheme between the base body and the cover plate of the seismograph of the present invention.

[0021] Figure numbers: 10 - seismograph base; 100 - seismometer; 101 - balancing blade; 102 - first blade; 103 - cover plate; 104 - fixed base; 20 - limiting base; 201 - limiting sphere; 30 - battery; 301 - balancing sensor; 302 - controller. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0024] Embodiment 1

[0025] See attached Figure 1-Figure 5 As shown, a bottom-sea seismograph system includes a seismograph base 10 and a seismometer 100 arranged in the seismograph base 10. The seismograph base 10 is a columnar sleeve structure with a cavity and an opening at one end. A limiting base 20 coaxial with the seismograph base 10 is fixed inside the seismograph base 10. The limiting base 20 is a circular ring structure, and a limiting ball 201 is movably arranged at one end of the limiting base 20.

[0026] The inner side of the end of the limiting base 20 away from the limiting sphere 201 gradually shrinks inward. A fixed base 104 is movably provided inside the limiting base 20. The fixed base 104 is a column structure, and the diameter of the column decreases from the middle of the column to the two ends of the column. The fixed base 104 can slide along the inner wall of the limiting base 20. The limiting sphere 201 is arranged between the fixed base 104 and the seismograph base 10.

[0027] After the seismograph enters the water, since the seismograph base 10 and its inner limiting base 20 are made of metal, they will press the fixed base 104 downward to sink rapidly. When sinking to the seabed, the power devices such as the balancing fan blades 101 will have a certain buffer to ensure that when the seismograph suddenly slows down or stops, the seismometer 100 inside it will not rush out of the seismograph, and the limiting ball 201 inside the seismograph base 10 will give the fixed base 104 a certain amount of resistance and friction. When the seismograph falls to the seabed, the limiting ball 201 will give the fixed base 104 a certain amount of resistance and friction. The obstruction and friction of the base 104 will cause the fixed base 104 to be slowly pulled downward by the seismometer 100, reducing the bottom impact of the fixed base 104 and the seismometer 100, and achieving the slow downward movement of the seismometer 100 and the continuous downward displacement of the seabed sediment for a period of time until the seismometer 100 is completely released into place. This solves the problem that the direct fall of the seismometer 100 may cause a gap between the bottom of the seismometer 100 and the seabed sediment to affect signal acquisition, and makes it fully contact with the seabed, thereby ensuring the signal-to-noise ratio to the greatest extent.

[0028] A seismometer 100 is arranged at the axial position of the fixed base 104, and the seismometer 100 is threadedly fixed to the fixed base 104. The seismometer base 10 has a cover plate 103 at one end of the opening, and a through hole is arranged at the center of the cover plate 103, and the diameter of the through hole is smaller than the maximum diameter of the fixed base 104, so as to ensure that the fixed base 104 will not rush out of the seismometer no matter how large the impact force is, and the cover plate 103 is threadedly fixed to the seismometer base 10.

[0029] The side array of the seismograph base 10 is provided with a balancing blade 101, and the balancing blade 101 is fixedly connected to the seismograph base 10 through a plate body, and a protective cover is provided around the balancing blade 101, and the balancing blade 101 is in the same direction as the central axis of the seismograph base 10. The side of the seismograph base 10 is also provided with a first blade 102, and the first blade 102 is in a different direction from the central axis of the seismograph base 10. The lowest point of the first blade 102 is higher than the highest point of the balancing blade 101. A controller 302 is provided at the bottom of the seismograph base 10, and the controller 302 is connected to a balancing sensor 301, and a battery 30 is also provided therein for powering various electronic components.

[0030] First, the balancing blade 101 and the first blade 102 can be used as a power device to send the seismometer to the target point so that the seismometer lands smoothly on the seabed. Secondly, the measurement result of the seismometer 100 is closely related to whether the seismometer 100 is balanced on the seabed, which can directly affect the signal-to-noise ratio to a large extent. When the seismometer is in a horizontal state, the signal-to-noise ratio is the highest and the measurement result is the most accurate; on the contrary, when the seismometer is in a tilted state, the signal-to-noise ratio is reduced and the measurement result will have errors.

[0031] When the seismograph falls on the seabed, the rotation of the balancing blade 101 will blow away the seabed mud and sand below the balancing blade 101, so that the seismograph can adjust its position. The blown away mud and sand will also cover the protective cover on the surface of the balancing blade 101, thereby blocking the impact of water flow and fixing the position of the seismograph. The protective cover can also further ensure that the balancing blade 101 will not be stuck by the seabed mud and sand during its rotation on the seabed.

[0032] Furthermore, the balance sensor 301 in the seismograph senses the position of the seismograph and feeds back the result to the controller 302 in real time. The controller 302 controls the balance blades 101 at the relative position to rotate, blows away the mud and sand at the corresponding position, and finally puts the seismograph in a balanced state. At the same time, it cooperates with the limit components inside the seismograph to put the seismometer in the best working state.

[0033] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

[0034] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A bottom-seismic instrument mounting system, comprising a seismic instrument base (10) and a seismometer (100) arranged in the seismic instrument base (10), Features: The seismograph base (10) is a columnar sleeve-shaped structure having a cavity and an opening at one end; a limiting base (20) coaxial with the seismograph base (10) is fixedly arranged inside the seismograph base (10); the limiting base (20) is a circular ring structure; a limiting ball (201) is movably arranged at one end of the limiting base (20); the inner side of one end of the limiting base (20) away from the limiting ball (201) is gradually contracted inwards; a fixed base (104) is movably arranged inside the limiting base (20); the fixed base (104) is a columnar structure; the diameter of the column decreases from the middle of the column to both ends of the column; the fixed base (104) can slide along the inner wall of the limiting base (20); the limiting ball (201) is arranged between the fixed base (104) and the seismograph base (10).

2. The bottom-seismic instrument mounting system according to claim 1, characterized in that: The seismometer (100) is arranged at an axial position of the fixed base (104), and the seismometer (100) is threadedly fixed to the fixed base (104).

3. The bottom-seismometer system according to claim 1, characterized in that: The seismograph base (10) has an open end with a cover plate (103), a through hole is provided at the center of the cover plate (103), the diameter of the through hole is smaller than the maximum diameter of the fixed base (104), and the cover plate (103) is fixed to the seismograph base (10) by means of threads.

4. The bottom-seismic instrument mounting system according to claim 1, characterized in that: A controller (302) is provided at the bottom of the seismograph base (10), and the controller (302) is connected to a balance sensor (301).

5. The bottom-seismometer mounting system according to claim 1, characterized in that: The side array of the seismograph base (10) is provided with balancing blades (101); the balancing blades (101) are fixedly connected to the seismograph base (10) via a plate; a protective cover is provided around the balancing blades (101); and the balancing blades (101) are oriented in the same direction as the central axis of the seismograph base (10).

6. The bottom-seismometer mounting system according to claim 5, characterized in that: A first fan blade (102) is also provided on the side of the seismograph base (10), and the first fan blade (102) is in a different direction from the central axis of the seismograph base (10).

7. The bottom-seismic instrument mounting system according to claim 6, characterized in that: The lowest horizontal point of the first blade (102) is higher than the highest horizontal point of the balancing blade (101).

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