17 results about "Submarine earthquake" patented technology

The application discloses a method and device for extracting Scholte wave attenuation coefficients, a system and a storage medium, and comprises the following steps: collecting seabed seismic data of an observation area; obtaining a pretreated common-receiver gather based on the seabed seismic data of the observation area; based on the CRG gather data in the SU format pretreated by the seabed seismograph, using high-resolution forward and inverse transformation, separating and extracting the base-order CRG gather with energy focusing and single order from the CRG gather coupled and stacked by multiple-order Scholte waves; based on the base-order CRG seismic gather, calculating the attenuation coefficients of any two gathers, and after the cyclic calculation of all gather pairs is completed, the average attenuation coefficient model corresponding to the gather pair is obtained. By using the technical scheme of the application, the Scholte wave dispersion order can be accurately separated, and the base-order attenuation coefficient can be specially extracted.

The application relates to the technical field of underwater detection, in particular to an underwater vehicle autonomous detection system and method based on seabed seismic wave signals. The system comprises a three-axis seismic wave signal acquisition module, a signal superposition amplification module, a signal filtering module, a signal envelope extraction module, an environmental noise integration module and a threshold comparison determination module. The acquisition module is orthogonally arranged to receive three-axis seismic wave signals and convert the signals into charge signals, the superposition amplification module completes signal conversion and superposition, the filtering module suppresses noise, the envelope extraction module extracts a detection value, the noise integration module obtains a noise integral value, the comparison module compares the two values, and when the detection value is greater than the integral value, an underwater vehicle existing signal is output. The application uses seabed seismic waves as a detection source, has strong anti-interference performance, works in a passive mode, is concealed and has low power consumption, can accurately capture weak seismic wave signals of the underwater vehicle, realizes autonomous detection of the underwater vehicle, and is suitable for long-term unattended deployment on the seabed.

The application belongs to the technical field of seismic data acquisition, and specifically discloses a kind of underwater seismic data continuous acquisition method, system, equipment and medium, the system includes the main control module built-in watchdog mechanism, sensor, acquisition auxiliary module, data storage module and power supply module;The method comprises: the main control module starts data acquisition task, sensor collects seabed seismic data, and is stored to data storage module;During data acquisition, the main control module sends the watchdog to send dog feeding signal regularly, if not on time to send dog feeding signal, then the watchdog forces to restart the main control module, and the main control module restarts data acquisition task through acquisition auxiliary module.The application solves the problem of data interruption and time loss caused by program exception of seabed node, ensures the continuity and integrity of marine seismic data acquisition, and improves the reliability and economic benefit of marine oil and gas exploration operation.The application is suitable for continuous acquisition of underwater seismic data.

The application provides a deep-sea T-phase calculation method and system based on a seafloor seismic source mechanism, and the method comprises the following steps: determining calculation physical quantities in an elastic multilayer ocean crust medium and a fluid deep-sea sound channel for a deep-sea seafloor seismic T-phase propagation process, and establishing an acoustic wave-seismic wave combined elliptical differential equation in a two-dimensional cylindrical coordinate system; the elliptical differential equation is converted into an acoustic wave-seismic wave combined parabolic differential equation, a horizontal recursive equation in a root form of the acoustic wave-seismic wave combined parabolic differential equation is given, an initial field horizontal recursive equation in the root form suitable for a seafloor seismic event is established, the horizontal recursive equation in the root form is converted into an N p step loop recursive equation, numerical discrete processing is performed on operator action in the loop recursive equation, a representation form of calculation quantities of virtual points in a discrete process is given, and a seismic wave field in an ocean crust medium and an acoustic wave field in a deep-sea sound channel are obtained according to the loop recursive equation.

The invention relates to the technical field of underwater monitoring, and provides a submarine seismograph base station and system, the submarine seismograph base station comprises a seabed base, a seismograph, a floating ball, a locking piece and a protective cylinder, the protective cylinder is fixedly installed on the seabed base, the floating ball is connected with the seismograph through a tether, the seismograph is installed in the protective cylinder in a pluggable mode, and the protective cylinder is provided with a lock hole; the seismograph has a first state and a second state in the laying process; in the first state, the floating ball is fixed to the seismograph, the locking piece penetrates through the lock hole, and the seismograph is locked in the protective cylinder. And in the second state, the locking piece retreats from the protective cylinder, the seismograph is pulled out of the protective cylinder under the action of external force, and the cable is released so that the floating ball pulls the seismograph to sink into the landfill pit of the seabed. The seismograph can stably sink into the landfill pit of the seabed, the inclination angle of the seismograph is small, the laying difficulty of the whole seabed seismological observation base station is small, and the monitoring effectiveness of the seismograph is improved.

The invention discloses an efficient fluctuating seabed seismic wave numerical simulation method and a related device, and belongs to the technical field of seismology. The method comprises the following steps: constructing a push-up interface label-vector coupling wave equation; constructing a seismic wave operator recursion process of the push-up fluctuation interface based on the push-up interface mark-vector coupling wave equation; performing model reconstruction and interpolation through the original elastic parameter model to obtain a Kaiser window sinchinger function filtering speed model; and substituting the Kaiser window sinchinger function filtering speed model into the standard-vector coupling wave equation, and carrying out numerical simulation and outputting a seismic wave field in combination with a seismic wave operator recursion process of an up-pushing fluctuating interface. The method successfully solves the problems of stepped scattering and inaccurate travel time in seismic wave numerical simulation under the fluctuating seabed condition, does not need to greatly increase extra calculation amount, and can accurately simulate the propagation process of seismic waves in the marine environment.

The invention relates to the field of seismic data analysis, in particular to a seismic data noise suppression method and system based on deep learning. The method comprises the following steps: acquiring original seafloor seismic data of a target area and marine environment parameters which are in space-time correlation with the original seafloor seismic data; the marine environment parameters are mapped to generate a space-time continuous physical guidance noise field, the generation process of the physical guidance noise field is constrained by physical consistency, and the physical guidance noise field has low-frequency, coherent and smooth physical attributes of flow-induced noise; and taking the physical guidance noise field as physical guidance information, adaptively separating an effective seismic signal from the original seabed seismic data, and reconstructing and outputting a seabed seismic data set after noise suppression. Through combination of physical reasoning and deep learning, the model can distinguish signals like noise and noise of the image signals, and the high fidelity and generalization ability of seismic data noise reduction are improved.

A method of modeling a subsurface area of a seabed using fewer seismic sensors than a seismic sensors that generate sufficient data to permit a desired model of the subsurface area. Seismic datasets are received from the fewer seismic sensors. The fewer seismic sensors are located at points defined in relation to the seabed. Boundary conditions of a seismic wavefield at a fluid-solid interface between the seabed and water above the seabed are identified. An estimation, from the seismic datasets and the boundary conditions, is made of one or more virtual datasets. Each of the virtual datasets includes corresponding estimated data for additional points defined in relation to the seabed. The points and the additional points, combined, are sufficient to permit the desired model of the subsurface area. A subsurface model of the subsurface area is generated by modeling the subsurface area using the seismic datasets and the virtual datasets.

The application discloses a seabed slope model box for simulating seabed moving water pressure waves, which comprises a seabed slope model chamber, a moving water pressure wave device, a power equipment chamber and a weight lowering device. The weight lowering device can lift the moving water pressure wave device assembly to hit the water body at the bottom of the model box, so as to stimulate the moving water pressure wave generated by the fault dislocation caused by the seabed earthquake, and then the real marine water environment simulation around the seabed slope in the earthquake process is realized. The application has the advantages of simple structure, simple driving force provided by the weight stack, manual remote control of the moving water pressure wave stimulation time, and indoor seabed slope test conditions which are more in line with the actual working conditions and easy to observe the results.

The present application relates to the technical field of geophysical exploration, and particularly relates to a method and system for monitoring submarine earthquakes. Two interference optical fiber geological sensing rings with different physical parameters are deployed on a submarine to be monitored, and a phase demodulation interferometry method is used to obtain an observation signal vector; the observation signal vector is decomposed into a common seismic signal component and independent sparse interference components of each channel; an observation model is constructed based on a sparse dictionary transformation matrix, a wavelet domain sparse coefficient vector of each component, an observation signal vector, a sensing matrix and measurement noise; then, a joint optimization model is constructed according to the observation model, combined with a data error constraint term, a structured sparse constraint term and a physical prior constraint term, and solved to obtain a target sparse coefficient vector of each component; finally, a submarine earthquake monitoring result is obtained according to the target sparse coefficient vector of the seismic signal component, and precise and efficient submarine earthquake monitoring is achieved.

A method includes receiving a first seismic dataset based at least partially upon a signal. The signal is a subsea signal. The method also includes measuring one or more particle motion characteristics of the signal based at least partially upon the first seismic dataset. The method also includes separating the signal into an upgoing component, a downgoing component, and a direct arrival based on the one or more particle motion characteristics. The method also includes generating a propagation response between two or more of the sources based at least partially upon the downgoing component and the direct arrival. The method also includes generating a second seismic dataset based at least partially upon the propagation response.

The one or more embodiments of the present disclosure provide a Scholte wave dispersion curve adaptive inversion method and a related device, the method comprising: obtaining and processing original seismic data of a target seabed to obtain a Scholte wave dispersion curve; constructing an initial shear wave velocity model based on the Scholte wave dispersion curve through linear inversion; and fitting and optimizing the Scholte wave dispersion curve based on the initial shear wave velocity model to obtain a two-dimensional shear wave velocity profile. Through the technical solution of the present disclosure, the problem that the traditional linear inversion method relies on an initial model is solved, the calculation efficiency is significantly improved, and the local extremum problem is avoided, thereby providing an automatic high-precision inversion solution suitable for batch data processing for seabed seismic exploration.

The invention relates to a method and device for inverting a seabed sedimentary layer velocity structure through a cross-dimensional Scholte wave multi-order frequency dispersion curve, and the method comprises the steps: obtaining seabed seismic data, extracting the frequency dispersion curve observation data of multi-order Scholte waves in the seabed seismic data, and enabling the frequency dispersion curve observation data to be used for defining joint posterior probability distribution; sampling the joint posterior probability distribution by adopting a reversible vaulting Markov chain Monte Carlo algorithm to obtain a posterior sample; in the sampling process, the acceptance probability of skipping from the current state to the new state is calculated, and basic operation is executed by using the acceptance probability; the basic operation comprises a model updating operation, a model layer generating operation and a layer extinguishing operation; and calculating an optimal estimation value of the transverse wave velocity profile of the seabed sedimentary layer based on the posterior sample, quantifying an uncertainty range of the optimal estimation value, and generating an inversion result of the uncertainty range. According to the method, the problems of insufficient information utilization, model stiffness and insufficient uncertainty quantization caused by presetting a fixed hierarchical model are solved.

The invention discloses a submarine earthquake positioning method before seismic waves of a linear communication submarine cable, and the method comprises the following steps: obtaining geographic coordinates and an S-wave speed model of each receiving channel of the submarine cable before an earthquake; after an earthquake, obtaining a space-time-strain rate map of the submarine cable; acquiring a first seismic wave according to the space-time-strain rate diagram; obtaining wavefront information of the earthquake on the submarine cable according to the first seismic wave; based on an S-wave velocity model, constructing a differential equation representing the relation between the distance along the optical cable and the component of the seismic wave propagation velocity along the optical fiber direction by using a linear wavefront method; according to the differential equation and the wavefront information, obtaining the position relation between the epicenter position and the submarine cable reference point; and obtaining the coordinates of the epicenter position according to the geographic coordinates of each receiving channel of the submarine cable and the position relationship between the epicenter position and the submarine cable reference point. According to the invention, the existing submarine communication optical cable is combined with the distributed sound sensing technology, and the problem of insufficient positioning precision of the submarine earthquake caused by insufficient coverage of the OBS in the ocean is solved.

A system and method for deploying and retrieving a plurality of ocean bottom seismic nodes to and from the seabed. An autonomous underwater vehicle (AUV) is coupled to a node skid that is configured to handle the nodes. The AUV and coupled skid is lowered to and raised from the seabed and a surface vessel in a garage or basket. The skid may have a variable buoyancy system (VBS) formed of a plurality of pipes and a positive displacement pump, such that the VBS is configured to automatically control a buoyancy of the skid. The AUV and / or skid has a plurality of cameras for optical 3D stereo photogrammetry for identification, deployment, and retrieval of the nodes. Also disclosed is a method for retrieving a dead AUV from the ocean bottom by utilizing a garage and an unmanned underwater vehicle (UUV).

The invention relates to a submarine earthquake positioning method for communication submarine cable networking, which realizes high-precision submarine earthquake positioning. When the submarine cable network recognizes seismic waves, seismic wave data are obtained and power spectral density analysis is carried out to obtain a signal enhancement frequency band; performing data processing on the seismic wave data according to the signal enhancement frequency band to obtain a seismic waveform; carrying out seismic phase travel time extraction on the seismic waveform to obtain P-wave seismic phase travel time and S-wave seismic phase travel time, and carrying out calculation according to the P-wave seismic phase travel time and the S-wave seismic phase travel time to obtain a seismic phase travel time difference; acquiring a P-wave speed model and an S-wave speed model corresponding to the submarine cable network, and calculating according to the P-wave speed model, the S-wave speed model and the seismic phase travel time difference to obtain an epicentral distance; two preliminary seismic source points are obtained through calculation according to the epicentral distance, and a correct preliminary seismic source point in the two preliminary seismic source points is determined according to the S-wave seismic phase travel time of the head end channel and the S-wave seismic phase travel time of the tail end channel of the submarine cable in the S-wave seismic phase travel time.

The utility model provides a kind of disposable bottom seismic instrument without recycling, it is related to bottom seismic data acquisition equipment technical field, disposable bottom seismic instrument without recycling includes parent structure and daughter structure, the parent structure with the daughter structure separable connection, the parent structure is used to automatically float to water surface after separating from the daughter structure, three-component seismometer and data transmission device are arranged in the parent structure, the data transmission device with the three-component seismometer electric connection, the three-component seismometer is used to collect seismic data and transmit to the data transmission device, the data transmission device is used to send the seismic data to data receiving terminal by satellite.The disposable bottom seismic instrument without recycling of the utility model, compared with prior art, can be quickly laid to target sea area, especially suitable for aftershock tracking nature data acquisition.