Surface-wave tomography for near-surface characterization with continuous wavelet transform for two-station cross-correlation

研究成果: Contribution to conferencePaper査読

1 被引用数 (Scopus)

抄録

The multichannel analysis of surface waves (MASW) is the most popular approach to estimate dispersion curves of surface waves for near-surface S-wave velocity characterization. The MASW is robust because fundamental mode of surface waves could be distinguished from noise such as body waves or higher modes in the frequency-wavenumber domain. However, sharp lateral variation is difficult to accurately retrieve by MASW-based approach. We proposed a workflow to effectively estimate lateral variation of shallow subsurface from surface-wave tomography using active-source seismic data. In our approach, we stacked cross-coherence between two stations from different shot data to improve the stability of phase velocity estimation. We then applied continuous wavelet transform (CWT) for cross-coherence data to reduce the influence of noise by applying a time-domain filter. Lateral variation of phase velocities was finally estimated from dispersion curves between two stations by tomography. Numerical experiments demonstrated that our CWT-based approach could be used to accurately estimate phase velocity between two stations reflecting lateral variation of the simulated model. The lateral boundary could be well retrieved in the velocity model estimated by tomography. Application of our approach to field data indicated the high stability of phase velocity estimation between two stations and tomography analysis, compared to conventional MASW-based approach.

本文言語英語
ページ2531-2535
ページ数5
DOI
出版ステータス出版済み - 2019
イベント88th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2018 - Anaheim, 米国
継続期間: 10 14 201810 19 2018

その他

その他88th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2018
Country米国
CityAnaheim
Period10/14/1810/19/18

All Science Journal Classification (ASJC) codes

  • Geophysics

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