Modelling of ground motion in the Higashinada (Kobe) area for an aftershock of the 1995 January 17 Hyogo-ken Nanbu, Japan, earthquake |
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Authors: | Arben Pitarka Kojiro Irikura Tomotaka Iwata |
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Institution: | Woodward-Clyde Federal Services, 566 El Dorado Street, Suite 100, Pasadena, CA 91011, USA. E-mail: axpitar0@wcc.com;Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611, Japan |
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Abstract: | We model the ground motion from an aftershock of the 1995 January 17 Hyogo-ken Nanbu (Kobe) earthquake to investigate basin edge effects on wave propagation in Higashinada ward, downtown Kobe. Point-source finite-difference seismograms calculated using a double-couple solution and a 2-D basin structure are compared with the ground-motion velocity seismograms recorded in a small station array deployed at sites within and outside the heavily damage zone in Higashinada ward. The comparison suggests that in the frequency range 0.1-2 Hz that was analysed, the observed spatial amplitude variation of the aftershock ground motion is attributable mainly to the basin edge effects. We found that the basin edge effect, caused by the superposition of the direct S wave and the basin-edge-diffracted waves, amplified the ground motion in a narrow zone that is offset by about 0.7 km from the basin edge. |
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Keywords: | sedimentary basin strong ground motion surface waves synthetic seismograms |
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