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High-precision seismic travel time ray tracing method

A technology of ray tracing and seismic wave, which is applied in the direction of seismic signal processing, etc., can solve the problem of poor adaptability of the algorithm, and achieve the effects of improved calculation accuracy, strong adaptability, and accurate ray path

Inactive Publication Date: 2017-05-17
OCEAN UNIV OF CHINA
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Problems solved by technology

[0009] In order to achieve the above object, the present invention provides a high-precision seismic wave traveltime ray tracing method, which solves the problem in the prior art that the adaptability of the algorithm is not strong due to defects in the consideration of the direction of the ray

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Embodiment Construction

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] First introduce the basic principle of the traditional LTI algorithm in detail:

[0036] Such as image 3 As shown, the problem of finding the minimum travel time of a certain point P can be described as follows: Assuming that the coordinates and travel times of points A and B are known, find the minimum travel time from point C on the line segment AB to point P. Let point A be the coordinate origin, the length of AB is L, the length of AC is r, and the coordinates of point P are (...

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Abstract

The invention discloses a high-precision seismic travel time ray tracing method. The method comprises the steps that travel time on grid nodes of a whole area is obtained through calculation; the travel time of a node on the nodes on row grids is calculated again, and if the travel time is smaller than the original travel time, the travel time is replaced; for rows with the focus above the rows, a grid lower boundary is adopted as an interpolation line segment, the travel time of two nodes on a grid upper boundary is calculated again, and if the travel time is smaller than the original travel time, the travel time is replaced; a grid left boundary is adopted as an interpolation line segment, the travel time of two nodes on a grid right boundary is calculated again, and if the travel time is smaller than the original travel time, the travel time is replaced; the grid right boundary is adopted as an interpolation line segment, the travel time of two nodes on the grid left boundary is calculated again, and if the travel time is smaller than the original travel time, the travel time is replaced; the steps are repeated till the first row in space is reached. The method has high adaptability, the grid node travel time calculation precision is improved, and a corresponding ray path is more accurate.

Description

technical field [0001] The invention belongs to the technical field of earthquake monitoring, and relates to a high-precision seismic wave traveltime ray tracing method. Background technique [0002] The traditional ray tracing method includes the test shooting method and the bending line method. The test shooting method starts from the source and shoots a ray at a certain angle. The ray propagates according to Snell's law, and then according to the landing point of the ray on the ground and the actual receiving point Constantly adjust the initial shot angle, and finally calculate the travel time and ray path of the receiving point from the travel time difference of the two rays closest to the receiving point. The curved line method assumes that there is an initial ray path between the source and the receiving point, and then changes the ray path according to Fermat's principle, so as to obtain the minimum travel time and ray path of the receiving point. These two methods o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 王忠成童思友葛林苡李林伟
Owner OCEAN UNIV OF CHINA
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