Improved Method of Separating P-And S-Waves Using Divergence and Curl
详细信息
- 责任者：Li Zhiyuan (Key Laboratory of Mineral Resources ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Liang Guanghe
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(6)
- 关键词：纵波 ; P-waves ; 横波 ; S-waves ; 波场分离 ; wavefield separate
- 页码：p.2012-2022
- 图表：8 illus., 23 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
The separation of P- and S-wavefields from multi-component seismic data is very important, which has a direct impact on the follow-up data processing. In isotropic media, P-wavefield is curl-free and S-wavefield is divergence-free, so the P- and S-wavefields can be separated by taking the divergence and curl in frequency-wavenumber domain. However, only when the surface P velocity and S velocity are known, the P- and S-waves will be separated. In the paper, a method of estimating surface P velocity and S velocity is developed, which can obtain the surface velocities, even if they are unknown. A method for correcting phase and amplitude ratio of P-wave and S-wave is also presented, which solves the problem that the phase and amplitude ratios of P-wave and S-wave are changed after taking the divergence and curl.
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