Method and device for automatically extracting background noise frequency dispersion curve

A background noise and dispersion curve technology, applied in the field of geophysics, can solve problems such as low efficiency and time-consuming, and achieve the effect of improving work efficiency, saving time, and realizing automatic extraction

Pending Publication Date: 2021-05-28
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for automatically extracting the dispersion curve of background noise in view of the above-mentioned defects of the prior art, aiming to solve the problem that although the dispersion curve obtained by the manual extraction method in the prior art is of high quality, However, there are problems of time-consuming and low efficiency

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  • Method and device for automatically extracting background noise frequency dispersion curve
  • Method and device for automatically extracting background noise frequency dispersion curve

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[0048] The present invention discloses a method and device for automatically extracting background noise dispersion curves. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0049]Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, eleme...

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Abstract

The invention discloses a method and device for automatically extracting a background noise frequency dispersion curve, and the method comprises: obtaining background noise data recorded by a seismic station, carrying out the preprocessing, cross-correlation and superposition of the background noise data, obtaining an empirical green function, carrying out the vector wave number domain transformation of the empirical green function, and obtaining a frequency dispersion spectrum; according to the frequency dispersion spectrum and a Res-Unet++ network model, obtaining a candidate frequency dispersion area; and according to a gradient method and a chasing method, extracting and classifying frequency dispersion points of the candidate frequency dispersion area, and obtaining a target frequency dispersion curve. According to the embodiment of the invention, the automatic extraction of the frequency dispersion curve can be realized, the high-order frequency dispersion curve which is poorer in extraction by the extreme value method can be extracted, a lot of time of researchers is saved, and the working efficiency of the researchers is improved.

Description

technical field [0001] The invention relates to the technical field of geophysics, in particular to a method and device for automatically extracting background noise dispersion curves. Background technique [0002] Background noise is called a microarray in geotechnical engineering, which is a random wave field generated by many passive sources. The background noise cross-correlation method provides an effective method for measuring phase velocity or group velocity, and its proposal improves the resolution of surface wave tomography. Therefore, background noise imaging technology has been widely used, which is widely used to detect shallow structures and crustal lithospheric structures. An important step in background noise tomography is the extraction of reliable and accurate dispersion curves from the dispersion map. The current methods of extracting dispersion curves are mainly manual extraction method and extreme value method. Although the dispersion curve obtained by...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06N3/08
CPCG06N3/08G06F2218/02G06F2218/08G06F2218/12
Inventor 宋卫宾陈晓非冯旭平
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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