P wave attenuation structure by spectral inversion of seismic waveforms

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  • Fujihara Satoru
    Earth Simulator Center, Japan Agency of Marine-Earth Science and Technology Center
  • Kim Ahyi
    University of California-Berkeley, Dept. Earth and Planetary Science

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  • スペクトルインヴァージョンによるP波減衰構造

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Abstract

We introduce the 3-D attenuation tomographic approach that combines the frequency-domain inversions scheme consisting of a set of sub-inversions and the site effect estimation scheme based on the residual spectra. We apply it to data observed at the Japanese Islands to estimate three-dimensional P wave attenuation structure beneath the Japanese islands. The results show that the Qp-1 distribution is highly variable over the entire Japanese Islands, with the spatial wavelength of 2-3 degrees. This heterogeneous material property of the underground structure may be related to a tectonic state beneath the Japanese Islands.

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