Multi-station joint inversion of receiver function and surface-wave phase velocity data for exploration of deep sedimentary layers
Takeshi Kurose 1 2 3 Hiroaki Yamanaka 1 31 Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8502, Japan.
2 Currently: ITOCHU Techno-Solutions Corporation, 2-7-5, Minamisuna, Koto-ku, Tokyo 136-8581, Japan.
3 Corresponding authors. Emails: yamanaka@depe.titech.ac.jp; takeshi.kurose@ctc-g.co.jp
Exploration Geophysics 38(1) 19-28 https://doi.org/10.1071/EG07007
Submitted: 1 August 2006 Accepted: 20 October 2006 Published: 5 April 2007
Abstract
In this study, we propose a joint inversion method, using genetic algorithms, to estimate an S-wave velocity structure for deep sedimentary layers from receiver functions and surface-wave phase velocity observed at several sites. The method takes layer continuity over a target area into consideration by assuming that each layer has uniform physical properties, especially an S-wave velocity, at all the sites in a target area in order to invert datasets acquired at different sites simultaneously. Numerical experiments with synthetic data indicate that the proposed method is effective in reducing uncertainty in deep structure parameters when modelling only surface-wave dispersion data over a limited period range. We then apply the method to receiver functions derived from earthquake records at one site and two datasets of Rayleigh-wave phase velocity obtained from microtremor array surveys performed in central Tokyo, Japan. The estimated subsurface structure is in good agreement with the results of previous seismic refraction surveys and deep borehole data. We also conclude that the proposed method can provide a more accurate and reliable model than individual inversions of either receiver function data only or surface-wave dispersion data only.
Key words: genetic algorithms, microtremor array survey, multi-station joint inversion, phase velocity, receiver function, surface wave, S-wave velocity.
Acknowledgments
The authors thank Yoshihiro Kinugasa and Kenichiro Kusunoki for helpful advice and guidance in improving this paper. The thought-provoking comments from reviewers are also appreciated. Earthquake records used in this study were obtained by Japan Meteorological Agency. This study is supported in part by a Grant-in-Aid for General Scientific Research (nos. 14206081, 15510147) and Special Project for Earthquake Disaster Mitigation in Urban Areas from Japanese Ministry of Education, Culture, Sports, Science and Technology.
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