2-D Frequency-domain Waveform Inversion of Coupled Acoustic-Elastic Media with an Irregular Interface |
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| Authors: | Myung Hoon Kim Yunseok Choi Young Ho Cha Changsoo Shin |
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| Institution: | 1. Geophysical Prospecting Lab. Department of Energy Systems Engineering, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, 151-742, Korea
2. Marine Resource Research Division, Korea Ocean Research and Development Institute, Ansan, P.O. BOX, 426-600, Korea
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| Abstract: | In order to correctly interpret marine exploration data, which contain many elastic signals such as S waves, surface waves and converted waves, we have developed both a frequency-domain modeling algorithm for acoustic-elastic coupled media with an irregular interface, and the corresponding waveform inversion algorithm. By applying the continuity condition between acoustic (fluid) and elastic (solid) media, wave propagation can be properly simulated throughout the coupled domain. The arbitrary interface is represented by tessellating square and triangular finite elements. Although the resulting complex impedance matrix generated by finite element methods for the acoustic-elastic coupled wave equation is asymmetric, we can exploit the usual back-propagation algorithm used in the frequency domain through modern sparse matrix technology. By running numerical experiments on a synthetic model, we demonstrate that our inversion algorithm can successfully recover P- and S-wave velocity and density models from marine exploration data (pressure data only). |
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