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This report describes simulation and evaluation of long-period ground motions in the Kanto plain using the two source models, i.e., the SMGA and SPGA models, for the 2011 Tohoku earthquake. The two source models are validated by comparison with recorded motions using the 3D finite difference method. Amplitude level of long-period ground motions in the Kanto plain are discussed by using a hypothetical source model assuming that rupture of the 4 SPGAs off Miyagi Prefecture occur at off Ibaraki Prefecture, resulting in larger long-period components between 2.5 to 4 s than those estimated in the previous studies.

EVALUATION OF LONG-PERIOD GROUND MOTIONS IN KANTO PLAIN USING SOURCE MODELS FOR THE 2011 TOHOKU EARTHQUAKE