Analysis of Seismic Motion Characteristics That Contribute to Earthquake-Induced Landslides: Case Study of the 2004 Chuetsu and 2007 Chuetsu-Oki Earthquakes in Japan
DOI:
https://doi.org/10.64862/Keywords:
seismic motion, 2004 Chuetsu earthquake, 2007 Chuetsu-Oki earthquake, earthquake-induced landslidesAbstract
Earthquake-induced landslides can cause extensive damage; therefore, conducting rapid predictions immediately after an earthquake is crucial for risk mitigation. In this study, we investigated the seismic indexes that contribute to sediment transport with respect to the 2004 Chuetsu and 2007 Chuetsu-Oki earthquakes that occurred in Japan. The impacts of the indexes were assessed using correlation analyses. The results indicated that the “peak ground displacement x slope angle” was the largest contributions on small landslides and “squared velocity x slope angle” was on large landslides. In addition, small landslides correspond better to the seismic motion indexes than large landslides; this indicates that large landslides are more influenced by geology and/or ground properties in addition to seismic motion and slope angle.
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