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Nonlinear site response from the 2003 and 2005 Miyagi-Oki earthquakes

Earth, Planets and Space volume 58, pages 1593–1597 (2006)Cite this article

Abstract

We estimate nonlinear site response by comparing site response estimates from the 16 August 2005 Mj=7.2 and 26 May 2003 Mj=7.0 Miyagi-Oki earthquakes with site response estimates from aftershocks of the 2003 event. Site response is solved by a spectral inversion technique to separate source, path, and site components. The constraint motion in the inversion is a regional attenuation model derived from fitting the spectra of data recorded at borehole KiK-net stations in the region and a theoretical source spectrum for each event determined using the same borehole stations. Site response is calculated at the surface of the KiK-net and K-NET stations. In general, the average aftershock site response is larger than for the two mainshocks, especially at a higher frequency. When comparing site response with input ground motion level, the predominant frequency and the site response values tend to decrease as the level of input ground motion increases.

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Authors and Affiliations

  1. Department of Earth Science and Institute for Crustal Studies, University of California, Santa Barbara, USA

    Kenichi Tsuda & Jamison Steidl

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  1. Kenichi Tsuda
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  2. Jamison Steidl
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Correspondence to Kenichi Tsuda.

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Tsuda, K., Steidl, J. Nonlinear site response from the 2003 and 2005 Miyagi-Oki earthquakes. Earth Planet Sp 58, 1593–1597 (2006). https://doi.org/10.1186/BF03352667

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