SEISMIC WAVEFORM ESTIMATION AT THE OUMIGAWA LANDSLIDE INDUCED BY THE 2007 NIIGATAKEN CHUETSU-OKI EARTHQUAKE BASED ON SITE EFFECT SUBSTITUTION METHOD

Abstract

 Many landslides occurred in the near-source region of the 2007 Niigataken Chuetsu-oki Earthquake. A large scale landslide and disaster occurred in Oumigawa, Kashiwazaki City. Therefore, to clarify the landslide mechanism, it is necessary to estimate strong motions at the landslide with sufficient accuracy, taking into account site effects. In this study, seismic waveform at the landslide was estimated based on site-effect substitution method. The site effects at the landslide were evaluated based on newly conducted seismic observation near the landslide. Difference of the site effects between the landslide site and the permanent observation stations was indicated.