地震面波和P—导波正演模拟与波场分析

doi:10.11720/wtyht.2024.1387

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Abstract

Surface waves and guided P-waves,as two boundary-related wave phenomena,are a crucial part of the near-surface seismic wave field.This study investigated their generation mechanism and propagation regularity using the high-order staggered-grid finite-difference algorithm.First,it solved the problems like numerical dispersion and boundary conditions in numerical simulation.Based on this,it designed medium models under different thicknesses and elastic parameters for forward modeling.Furthermore,it extracted dispersion profiles and amplitude versus offset curves for analysis.In the case of a low-velocity thin layer on the surface,guided P-waves can be generated when the phase velocities of P and SV waves from the same source exceed the S-wave velocity but are less than the P-wave velocity of the underlying high-velocity layer.In media with high Poisson's ratios(>0.4),the phase velocities of surface waves and guided P-waves are sensitive to the S- and P-wave velocities,respectively.Surface waves and guided P-waves usually contain near-surface information that is unavailable in refracted and reflected waves.The appropriate acquisition,analysis,and inversion of near-surface information enable the establishment of a high-resolution near-surface model.This study generalized the generation conditions and wave field characteristics of surface waves and guided P-waves under the same source and deepened the understanding of their propagation regularity,laying a foundation for inversion and denoising research.

Key words： surface wave guided P-wave numerical simulation generation condition wave field analysis

Received: 23 October 2023 Published: 19 September 2024

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	Tong LIU
	Cheng-Yu SUN
	Rui-Qian CAI

Cite this article:

Tong LIU,Cheng-Yu SUN,Rui-Qian CAI. Forward modeling and wave field analysis of seismic surface waves and guided P-waves[J]. Geophysical and Geochemical Exploration, 2024, 48(4): 986-995.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1387 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I4/986

Diagram of stagger-grid difference

Diagram of model setting

Wave field snapshot
a—wave field snapshot with free boundary;b—wave field snapshot without free boundary

Seismic record
a—surface seismic records with free boundary;b—surface seismic records without free boundary

Comparison of single-channel seismic records
a—230^th seismic record with free boundary;b—230^th seismic record without free boundary

Elastic wave forward modeling record
a—seismic record(horizontal component);b—seismic record(vertical component);c—150 ms wave field snapshot

Analysis results of forward record
a—the particle motion trajectory of surface wave;b—curve of surface wave amplitude changing with offset;c—dispersion imaging

Elastic parameters of model

Model 1 seismic record(a) and dispersion relation(b)

Model 2 seismic record(a) and dispersion relation(b)

Model 3 seismic record(a) and dispersion relation(b)

Model 4 seismic record(a) and dispersion relation(b)

Model 5 seismic record(a) and dispersion relation(b)

fig.8a;b—amplitude curves extracted from seismic records in fig.9a
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Curve of amplitude changing with offset
a—amplitude curves extracted from seismic records in fig.8a;b—amplitude curves extracted from seismic records in fig.9a

The first derivative corresponds to the weight coefficient values of different order accuracies

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