Wave equation dispersion inversion of surface waves recorded on irregular topography

Type
Article

Authors
Li, Jing
Lin, Fan Chi
Allam, Amir
Ben-Zion, Yehuda
Liu, Zhaolun
Schuster, Gerard T.

KAUST Department
Center for Subsurface Imaging and Fluid Modeling
Earth Science and Engineering Program
Physical Science and Engineering (PSE) Division

KAUST Grant Number
OCRF-14 2014-CRG3-2300

Online Publication Date
2019-01-12

Print Publication Date
2019-04-01

Date
2019-01-12

Abstract
Significant 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.

Citation
Li, 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

Acknowledgements
The 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.

Publisher
Oxford University Press (OUP)

Journal
Geophysical Journal International

DOI
10.1093/gji/ggz005

Additional Links
https://academic.oup.com/gji/article/217/1/346/5288629

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