Journal
GEOPHYSICAL PROSPECTING
Volume 56, Issue 6, Pages 863-881Publisher
WILEY
DOI: 10.1111/j.1365-2478.2008.00735.x
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Funding
- Ministry of Education
- Korea Science and Engineering Foundation (KOSEF) [R0A-2006-000-10291-0]
- Korea Ocean Research and Development Institute [PM50101]
- Korea Institute of Marine Science & Technology Promotion (KIMST) [E19700107A160000100] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [과C6A2403, 2006-02610, R0A-2006-000-10291-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In order to account for the effects of elastic wave propagation in marine seismic data, we develop a waveform inversion algorithm for acoustic-elastic media based on a frequency-domain finite-element modelling technique. In our algorithm we minimize residuals using the conjugate gradient method, which back-propagates the errors using reverse time migration without directly computing the partial derivative wavefields. Unlike a purely acoustic or purely elastic inversion algorithm, the Green's function matrix for our acoustic-elastic algorithm is asymmetric. We are nonetheless able to achieve computational efficiency using modern numerical methods. Numerical examples show that our coupled inversion algorithm produces better velocity models than a purely acoustic inversion algorithm in a wide variety of cases, including both single- and multi-component data and low-cut filtered data. We also show that our algorithm performs at least equally well on real field data gathered in the Korean continental shelf.
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