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2-D simulation of the 1995 Hyogoken-Nanbu earthquake at six sections in Kobe City

2-D simulation of the 1995 Hyogoken-Nanbu earthquake at six sections in Kobe City

Pages 1457-1464 1999

The goal of this study is to spatially simulate main shock waveforms of the 1995 Hyogo-ken Nanbu earthquake by using the 2-D deep irregular underground structure in Kobe City. Six sections normal to the Rokko faults are modeled on the basis of 2-D seismic profiles determined from geophysical surveys. Outcrop motions on Rokko granite rock are deconvolved from the observed motions at the reference sites using theoretical transfer functions evaluated by the 2-D FEM. Ground surface motions are evaluated by 1-D effective stress analysis estimated outcrop motions on Osaka group layers as the incident waves. From the distributions of peak ground accelerations (PGA) and peak ground velocities (PGV) on the ground surface and Osaka group layers, large amplifications can be commonly seen in an area about 1 km from the basin edge toward the coast. These amplifications are primarily are primarily due to the basin effects. The distributions of PGA and PGV account for the distributions of damaged structures.

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Accession: 029571938

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