平成20年(2008年)岩手・宮城内陸地震による斜面災害

概要

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The brief report on landslides by the 2008 Iwate-Miyagi Naoriku earthquake (M7.0) was made. Deep seated landslides of the Neogene volcanic successions, landslides with debris flows of the Quaternary volcanic rocks, and shallow landslides of weathered rock were distributed on the mountainous slope of 750 km^2 wide around the Kurikoma yama (1627m). The landslide of the artificial valley fill occurred again on the series of developed slope which has the collapse of valley fill in the 2003 earthquake. The largest landslide of the Arato-sawa, 1.3km of length, 0.9km of width, 150m of depth, was known as the old landslide topography before the earthquake. It occurred on the gently sloping bedding planes, and controlled by the surface rupture of the earthquake fault on the left side of the landslide. The strong motion records around the landslide newly show the seismic characteristics of landslides on the mountainous slope.
2008-08-31