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

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

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ep%26s...58.1593t&link_type=abstract

Earth, Planets and Space, Volume 58, p. 1593-1597.

Computer Science

Scientific paper

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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