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Global optimization method for surface wave dispersion and body wave spectral ratio joint inversion shallow velocity

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, and achieve the effect of avoiding premature problems, fast calculation speed and high accuracy

Active Publication Date: 2018-12-21
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

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  • Global optimization method for surface wave dispersion and body wave spectral ratio joint inversion shallow velocity
  • Global optimization method for surface wave dispersion and body wave spectral ratio joint inversion shallow velocity
  • Global optimization method for surface wave dispersion and body wave spectral ratio joint inversion shallow velocity

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Embodiment Construction

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

[0025] like figure 1 As shown, the present invention proposes a global optimization method for joint inversion of shallow layer velocity by surface wave dispersion and body wave spectral ratio, including the following steps:

[0026] 1) Given the initial parameters of the inversion, construct a population of unknown vectors expressed in binary code.

[0027] The given initial parameters include the density of each shallow layer of soil, the quality factors of P-wave and S-wave, and the empirical relationship between the velocity of P-wave and S-wave obtained from 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 coded in binary to facilitate the population evolution of the subsequent genetic simulated annealing method.

[0028] 2...

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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 acquiring a near-surface shallow velocity structure in the field of shallow seismic exploration, in particular to a global optimization method for jointly inverting shallow velocity based on surface wave dispersion and body wave spectral ratio. Background technique [0002] The shallow velocity structure is the basic data to carry out the analysis and evaluation of the site seismic effect. Conventional methods for obtaining shallow velocity structures include borehole logging and active source detection. Borehole logging is limited by cost and drilling depth. For some projects with a wide spatial distribution, it can only be deployed at key control points. Active source detection is limited by site conditions, and the resolution of soil structure is difficult to meet the project requirements. need. Therefore, the research and development of convenient and economical shallow velocity structure exploration methods ...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 荣棉水
Owner NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
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