小田原付近のM7級地震の想定と各地の地震動の予測

概要

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For future earthquake disaster prevention and hazard mitigation, it is very important to predict in advance the earthquake motions from hypothetical earthquakes which may occur with high possibility. Based on the investigation of seismic activities near the Ashigara Valley, two kinds of M7-class earthquakes; an inter-plate earthquake and a plate-fracture earthquake, are assumed in this paper. The ground motions induced by the above two earthquakes are predicted at nine observation stations by using the empirical approach. The maximum velocities of the ground motions at Odawara are about 80 cm/s at the rock surface and about 160 cm/s at the sedimental layer surface. The velocity response spectra from the nearfield surface motion are almost as strong as the ones from the record of 1995 Hyogo-ken Nambu Earthquake at Kobe Marine Meteorological Observatory.
1997-07-30