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A Global Optimal Method for Inverting Shallow Velocities Jointly by Surface Wave Dispersion and Volume Spectral Ratio

A joint inversion and global optimization technology, applied in seismology, instruments, measuring devices, etc., can solve the problems that are difficult to meet the requirements of shallow velocity structure detection, so as to avoid premature problems, fast calculation speed, and overcome calculation inaccuracy Effect

Active Publication Date: 2019-10-25
NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
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Problems solved by technology

Traditional methods have been difficult to meet the requirements of shallow velocity structure detection in large areas and urban areas

Method used

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  • A Global Optimal Method for Inverting Shallow Velocities Jointly by Surface Wave Dispersion and Volume Spectral Ratio
  • A Global Optimal Method for Inverting Shallow Velocities Jointly by Surface Wave Dispersion and Volume Spectral Ratio
  • A Global Optimal Method for Inverting Shallow Velocities Jointly by Surface Wave Dispersion and Volume Spectral Ratio

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Embodiment Construction

[0024] The present invention will be described in detail below with reference to the drawings and embodiments.

[0025] Such as figure 1 As shown, the present invention proposes a global optimization method for joint inversion of shallow layer velocity with surface wave dispersion and body wave spectrum ratio, which includes the following steps:

[0026] 1) Given the initial parameters of the inversion, construct an unknown vector population represented by binary codes.

[0027] The given initial parameters include the empirical relationship between the density of each layer of the shallow ground, the quality factors of P-wave and S-wave, and the empirical relationship between the P-wave and S-wave velocity based on the limited information of the inversion target site. The layer thickness is used as an unknown quantity to construct the initial population, and the initial population is encoded in binary to facilitate the population evolution of the subsequent genetic simulated anneal...

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Abstract

The invention relates to a global optimization method for surface wave dispersion and body wave spectral ratio joint inversion shallow velocity. The method comprises the following steps that (1), initial parameters of the inversion are given to construct an unknown vector population represented by binary coding; (2), theoretical calculation methods of a surface wave dispersion curve and a body wave HVSR curve are determined; (3), an object function simultaneously fitting the surface wave dispersion curve and the body wave HVSR curve is established; (4), global optimization calculation of genetic simulated annealing is conducted to obtain a globally optimal solution; and (5), the shallow velocity structure can be obtained based on the globally optimal solution. Advantages of genetic and simulated annealing methods are combined, efficiency and accuracy of the inversion can be improved, application in urban areas with the survey lines being difficult to unfold can be achieved, and application in background noise, seismic measuring or strong earthquake records and other data sources can be achieved.

Description

Technical field [0001] The invention relates to a method for obtaining a near-surface shallow velocity structure in the field of shallow seismic exploration, in particular to a global optimization method for inversion of shallow velocity based on surface wave dispersion and body wave spectrum ratio. Background technique [0002] The shallow velocity structure is the basic data for carrying out site seismic impact analysis and evaluating site seismic effects. The conventional methods to obtain the shallow velocity structure include borehole logging and active source detection. Drilling and logging are limited by cost and drilling depth. For some projects with a wide range of space, they can only be deployed at key control points. Active source detection is greatly restricted by site conditions, and the resolution of soil structure is also difficult to meet the project. need. Therefore, a convenient and economical shallow velocity structure exploration method for research and dev...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 荣棉水唐晖
Owner NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
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