대한자원환경지질학회:학술대회논문집 (Proceedings of the KSEEG Conference)
- 대한자원환경지질학회 2002년도 춘계 공동학술발표회
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- Pages.159-162
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- 2002
Pseudo-multiscale Waveform Inversion for Velocity Modeling
- Yang Dongwoo (Seoul National University, Geophysical Prospecting Lab.) ;
- Shin Changsoo (Seoul National University, Geophysical Prospecting Lab.) ;
- Yoon Kwangjin (Seoul National University, Geophysical Prospecting Lab.) ;
- Yang Seungjin (Hanyang University, Geophysical Prospecting Lab.) ;
- Suh Junghee (Seoul National University, Geophysical Prospecting Lab.) ;
- Hong Soonduk (Seoul National University, Geophysical Prospecting Lab.)
- 발행 : 2002.04.01
초록
We tried to obtain an initial velocity model for prestack depth migration via waveform inversion. For application of any field data we chose a smooth background layered velocity model (v=v0 + k x z) as an initial velocity model. Newton type waveform inversion needs to invert huge Hessian matrix. In order to compute full Hessian matrix arising from full aperture data and full illumination zone, we meet insurmountable difficulties of paying astronomical computing cost. For the layered media, approximate Hessian emerging from single shot aperture data can be used repeatedly for split spread source configuration. In our work of using this Hessian characteristic of layered media we attempted to obtain the approximate velocity model as close as possible to the true velocity model in first iteration.
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