Rayleigh wave multi-mode dispersion curve inversion method based on generalized objective function
A technology of objective function and dispersion curve, which is applied in seismology, instruments, measuring devices, etc., can solve problems such as low accuracy and large dependence on dispersion curve mode confirmation, so as to improve correctness, reduce ambiguity, reduce The effect of pattern misjudgment
Active Publication Date: 2020-10-09
CENT SOUTH UNIV
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[0007] The present invention provides a Rayleigh wave multi-mode dispersion curve inversion method based on a generalized objective function. Large and inaccurate problems
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[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0038] Such as figure 1 As shown, the embodiment of the present invention provides a Rayleigh wave multi-mode dispersion curve inversion method based on the generalized objective function. The ground-ground geological interpretation is located at the core inversion position, where the measured frequency dispersion spectrum is obtained after surface wave data processing. Specifically, the above inversion methods include:
[0039] Step 11, pick the mea...
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The invention provides a Rayleigh wave multi-mode frequency dispersion curve inversion method based on a generalized objective function. The method comprises a step of picking up actually-measured frequency dispersion points from an actually-measured frequency dispersion spectrum, a step of carrying out point separation processing on the picked actually-measured frequency dispersion points to obtain base-order frequency dispersion points and non-base-order frequency dispersion points, a step of separating the separated base-order frequency scatter points by taking a selection rate as a reference, a step of performing point weighting processing on all the frequency dispersion points which are subjected to the point separation processing, a step of assembling an inversion objective functionof a multi-mode frequency dispersion curve according to a point weighting processing result, and a step of performing inversion according to the inversion target function to obtain a transverse wave velocity profile. According to the method, the inversion can be completed quickly and accurately under the condition of small dependence on frequency dispersion curve mode confirmation, so that the transverse wave speed of a stratum is obtained.
Description
technical field [0001] The invention relates to the technical field of near-surface seismic surface wave exploration, in particular to a Rayleigh wave multi-mode dispersion curve inversion method based on a generalized objective function. Background technique [0002] Rayleigh wave (Rayleigh wave) exploration is an engineering geophysical exploration method that has developed very rapidly in recent years. It has the characteristics of non-destructive, efficient, economical, and high signal-to-noise ratio. and so on have a wide range of applications. The core link of Rayleigh wave exploration is to invert the measured dispersion curve extracted from the measured seismic records. According to the inversion results, the shear wave velocity structure of the underground geological medium can be obtained, which can guide many scientific and engineering issues. [0003] The key to the inversion of Rayleigh wave dispersion curves is to determine an inversion objective function. On...
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IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 张大洲杨博熊章强
Owner CENT SOUTH UNIV