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Method and system suitable for shallow structure detection in urban area

A regional and shallow technology, applied in the field of exploration geophysics, can solve the problems of small number of excitation points, limited precision of P wave velocity structure, etc., and achieve high-precision detection effect

Pending Publication Date: 2022-04-29
INST OF GEOPHYSICS CHINA EARTHQUAKE ADMINISTRATION
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  • Application Information

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Problems solved by technology

However, the green artificial seismic source detection is limited by cost and construction, and the number of excitation points is small, and the accuracy of the P-wave velocity structure obtained by the imaging method based on travel time is limited.

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  • Method and system suitable for shallow structure detection in urban area
  • Method and system suitable for shallow structure detection in urban area
  • Method and system suitable for shallow structure detection in urban area

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Embodiment 1

[0032] see figure 1 , the present invention provides a kind of method that is applicable to shallow structure detection in urban area, and this method comprises the following steps:

[0033] S1: The early arrival wave extraction range is given according to the geological background and offset distance, and the early arrival wave information in the artificial seismic source body wave data is extracted. The artificial seismic source body wave data is detected by the geophone after methane detonation in urban areas The data;

[0034] S2: Using a numerical simulation method to perform forward modeling on the early arrival wave information to obtain early arrival wave simulation information;

[0035] S3: Construct an objective function according to the early arrival wave information and the early arrival wave simulation information, the objective function is used to measure the mutual matching degree of the early arrival wave information and the early arrival wave simulation infor...

Embodiment 2

[0079] see figure 2 , the present invention provides a system suitable for shallow structure detection in urban areas, the system comprising:

[0080] The extraction module 1 is used to extract the early arrival wave information in the artificial seismic source body wave data, and the artificial seismic source body wave data is the data obtained by detection after methane detonation;

[0081] The forward modeling module 2 is used to perform forward modeling on the early arrival wave information using a numerical simulation method to obtain early arrival wave simulation information;

[0082] An objective function building module 3, configured to construct an objective function according to the early arrival wave information and the early arrival wave simulation information, the objective function is used to measure the interaction between the early arrival wave information and the early arrival wave simulation information Matching degree;

[0083] An inversion module 4, conf...

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Abstract

The invention provides a method and system suitable for urban area shallow structure detection, and relates to the field of exploration geophysics, and the method comprises the following steps: extracting early arrival wave information in artificial seismic source body wave data; performing forward modeling on the early arrival wave information by using a numerical simulation method to obtain early arrival wave simulation information; constructing a target function according to the early arrival wave information and the early arrival wave simulation information; performing inversion on the target function to obtain an iterative search direction; according to the iterative search direction, updating the transverse wave velocity and the longitudinal wave velocity by using a mixed step length to obtain an optimal transverse wave velocity and an optimal longitudinal wave velocity; and constructing a shallow structure detection image according to the optimal transverse wave speed and the optimal longitudinal wave speed. According to the invention, high-precision detection can be carried out on the superficial structure of the urban area.

Description

technical field [0001] The invention relates to the field of exploration geophysics, in particular to a method and system suitable for detecting shallow structures in urban areas. Background technique [0002] The fine exploration of urban shallow structures is of great significance to the research of earthquake prevention and disaster reduction, urban planning, and utilization of urban underground space. The use of dense array observations and noise imaging methods allows relatively low-cost detection of shallow structures in urban areas. However, limited by the periodic frequency band of the background noise and the characteristics of the surface wave itself, the relevant imaging results based on the background noise are mostly smooth S-wave velocities with low resolution. [0003] Artificial seismic sources are an important tool for detecting shallow structures, but traditional explosive seismic sources have a great impact on urban environmental protection and safety, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/34
CPCG01V1/30G01V1/345G01V2210/644
Inventor 马晓娜杨微王伟涛张云鹏徐善辉于子叶许卫卫
Owner INST OF GEOPHYSICS CHINA EARTHQUAKE ADMINISTRATION
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