Abstract
A waveform inversion was conducted for the rupture process of the 2005 West Off Fukuoka Prefecture erthquake (MJ 7.0) by using aftershock records as Green’s functions. Paying attention to the similarity of the group delay time between the mainshock and aftershock records, two aftershocks were selected to be used in the inversion. As a result of the inversion, we have obtained a rupture model that can explain mainshock records in the frequency range from 0.2 to 2 Hz. The model is composed of two primary asperities; one is located in the southeast part of the fault plane, close to the Genkai Island, and the other is located in the northwest part of the fault plane, about 8 km from the hypocenter. Contributions from the former asperity is significant for the ground motions in the city of Fukuoka, which is located southeast of the source region, while contributions from the latter asperity is significant for the ground motions at Tsushima Island, which is located northwest of the source region.
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