Spectral characteristics of earthquake input motion on the base rock

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(1) Possibility of a shock wave on The Hogoken-nanbu EarthquakeTo make clear whether a shock wave had existed or not in seismic wave due to The Hogoken-nanbu Earthquake, the shock wave tests has been carried out regarding the representative strong motion seismographs and the acoustic level has examined when the shock arrived at ground surface. Consequently, it may be concluded that exist of shock wave is not realistic.(2) Applicability of 2-D wave simulation program using different method2-D simulation program for seismic wave propagation using different method was examined through the simulation of aftershock waves at the small Kaminokuni basin, Hokkaido. It was confirmed the surface wave produced at margin of basin was well simulated by this program.(3) Formulation of special characteristics on base rockObservation records at rock site during The Hogoken-nanbu Earthquake and The Kocaeli Earthquake were analyzed. The recurrent formula has been calculated for the velocity response spectra of each record and compared with the existing empirical design spectra. The results show the recurrent spectra at near the fault have very large amplitude in long range in comparison with the empirical those.