FULL WAVEFORM INVERSION OF GAS HYDRATE RELATED BOT...
SONG Haibin1，2 MATSUBAYASHI Osamu1 KURAMOTO Shin'ichi1
（1.Institute of Geology and Geophysics，CAS，Beijing 100029，China 2.National Institute of Advanced Industrial Science and Technology，Tsukuba 3058567，Japan）
Abstract：We propose a full waveform inversion strategy for gas hydrate-related bottom simulating reflectors，which assumes stratified elastic media and is implemented in intercept time-slowness domain.It consists of two steps with a combination of a global search method and a nonlinear local search method.In the first step，long wavelength parts of velocity structure are estimated by very fast simulated annealing algorithm，and using travel-time information.In the second step，short wavelength velocity variations are included into the model by the conjugate gradient method，and waveform information in intercept time-slowness domain is used.The multi-grid parameter technique is used in our full waveform inversion.The method is applied to study a double BSR in the eastern Nankai accretionary wedge offshore Japan.The results show that the full waveform inversion is an important tool for gas hydrate research.(https://www.daowen.com)
Key words：Full waveform inversion Gas hydrates Bottom-simulating reflector Eastern Nankai Trough
Originally Published in：Chinese Journal of Geophysics，2003，46（1）：44～52
