Seismic waveform estimation at the Higashitakezawa landslide induced by the 2004 Mid Niigata Prefecture Earthquake based on empirical site amplification and phase effects

Abstract

Many landslides occurred in a large area during the 2004 Mid Niigata Prefecture Earthquake. The greatest landslide and disaster occurred in Higashitakezawa, old Yamakoshi village near the seismic fault. Therefore, to clarify the landslide mechanism, it is necessary to estimate strong ground motions at Higashitakezawa landslide with sufficient accuracy, taking into account site effects. In this study, seismic waveform at the Higashitakezawa landslide was estimated based on empirical site amplification and phase effects. Site effects at the Higashitakezawa landslide were evaluated based on seismic observation records at the New Kogomo Community Center. Difference of site effects between the Higashitakezawa landslide and the Yamakoshi Branch of Nagaoka City was indicated.