A Broadband Source Modeling of Interplate Earthquakes,Method and Application

Abstract eng:
A method to model broadband source process of hypothetical interplate earthquakes is validated through comparing predicted ground motion with observation of a recent interpolate earthquake in Japan. The method (Sekiguchi et al., 2008) modifies a so-called characteristic asperity model with very long-wavelength heterogeneity by adding adequate amount of shorter wavelength heterogeneity so that the model can generate a broadband ground motion. This method was applied to construct a broadband source model for the 2003 Tokachi-oki earthquake using an inverted source model as a base source model. Synthesized broadband ground motion reconstructed spectra level similar to the observation in the frequency range even above that constrained by the source inversion, which shows the adequacy of the method.

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