Wave equation dispersion inversion of surface waves recorded on irregular topography
KAUST DepartmentCenter for Subsurface Imaging and Fluid Modeling
Earth Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant NumberOCRF-14 2014-CRG3-2300
Online Publication Date2019-01-12
Print Publication Date2019-04-01
Permanent link to this recordhttp://hdl.handle.net/10754/656382
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AbstractSignificant topographic variations can strongly influence the amplitudes and phases of propagating surface waves. Such effects should be taken into account, otherwise the S-velocity model inverted from the Rayleigh or Love dispersion curves will contain significant inaccuracies. Here, we show that the recently developed wave equation dispersion inversion (WD) method naturally takes into account the effects of topography to give accurate S-velocity tomograms. Application of topographic WD (TWD) to synthetic data demonstrates that TWD can accurately invert for the S-velocity model from dispersion curves computed from data recorded over variable topography. This method is applied to ambient noise seismic field data recorded along the Clark strand of the San Jacinto fault zone in Southern California. The resulting TWD S-velocity tomogram appears to be more consistent with the geology than the standard WD tomogram.
CitationLi, J., Lin, F.-C., Allam, A., Ben-Zion, Y., Liu, Z., & Schuster, G. (2019). Wave equation dispersion inversion of surface waves recorded on irregular topography. Geophysical Journal International, 217(1), 346–360. doi:10.1093/gji/ggz005
SponsorsThe research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST), Saudi Arabia. We are grateful to the sponsors of the Center for Subsurface Imaging and Modeling (CSIM) Consortium for their financial support. We also thank KAUST for providing funding by the CRG grant OCRF-14 2014-CRG3-2300. Finally, we would like to express thanks to Mrinal Sinha, anonymous journal referees and Editor Dr. Wolfgang Friederich for valuable comments.