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Exploration of deep sedimentary layers in Tacna city, southern Peru, using microtremors and earthquake data for estimation of local amplification

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Abstract

S-wave velocity profiles of sedimentary layers in Tacna, southern Peru, based on analysis of microtremor array data and earthquake records, have been determined for estimation of site amplification. We investigated vertical component of microtremors in temporary arrays at two sites in the city for Rayleigh wave phase velocity. A receiver function was also estimated from existing earthquake data at a strong motion station near one of the microtremor exploration sites. The phase velocity and the receiver function were jointly inverted to S-wave velocity profiles. The depths to the basement with an S-wave velocity of 2.8 km/s at the two sites are similar as about 1 km. The top soil at the site in a severely damaged area in the city had a lower S-wave velocity than that in a slightly damaged area during the 2001 southern Peru earthquake. We subsequently estimate site amplifications from the velocity profiles and find that amplification is large at periods from 0.2 to 0.8 s at the damaged area indicating possible reasons for the differences in the damage observed during the 2001 southern Peru earthquake.

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Acknowledgments

We thank Dina Cotrado Flores, Private University of Tacna, for her support and discussion. We also appreciate students at National University of Engineering and Private University of Tacna for their support in microtremor measurements. We also thank two anonymous reviewers for comments to improve the manuscript. This study was supported with the JST-JICA SATREPS project, “Enhancement of Earthquake and Tsunami Disaster Mitigation Technology in Peru.”

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Authors and Affiliations

  1. Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa, 226-8503, Japan

    Hiroaki Yamanaka, Mileyvi Selene Quispe Gamero, Kosuke Chimoto & Kouichiro Saguchi

  2. Japan Peru Center for Earthquake Engineering Research and Disaster Mitigation (CISMID), National University of Engineering, Av. Tupac Amaru 1150, Rimac. Lima, Peru

    Diana Calderon, Fernándo Lázares La Rosa & Zenón Aguilar Bardales

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  1. Hiroaki Yamanaka
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  2. Mileyvi Selene Quispe Gamero
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  3. Kosuke Chimoto
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  4. Kouichiro Saguchi
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  5. Diana Calderon
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  6. Fernándo Lázares La Rosa
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  7. Zenón Aguilar Bardales
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Correspondence to Hiroaki Yamanaka.

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Yamanaka, H., Gamero, M.S.Q., Chimoto, K. et al. Exploration of deep sedimentary layers in Tacna city, southern Peru, using microtremors and earthquake data for estimation of local amplification. J Seismol 20, 107–116 (2016). https://doi.org/10.1007/s10950-015-9513-0

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  • DOI: https://doi.org/10.1007/s10950-015-9513-0

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