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Distribution and characteristics of landslides induced by the Iwate-Miyagi Nairiku earthquake in 2008 in Tohoku district, northeast Japan



Distribution and characteristics of landslides induced by the Iwate-Miyagi Nairiku earthquake in 2008 in Tohoku district, northeast Japan



Landslides 6.4



The Iwate-Miyagi Nairiku Earthquake in 2008, whose seismic intensity was M. 7.2 in Japan Meteorological Agency (JMA) scale, induced innumerable landslides on the southern flank of Mt. Kurikoma volcano allocated along the Ou Backbone Range in Northeast Japan. Most landslides are detected in a hanging wall side of the seismic fault. Those landslides are classified into five types: deep-seated slide, debris slide, shallow debris slide, secondary shallow debris slide, and debris flow. Most common landslide types induced by the earthquake are shallow debris slides and subsequent debris flows. They are intensively distributed along steep gorges incising a volcanic skirt of Mt. Kurikoma, consisting of welded ignimbrite of the Pleistocene age. Debris flows are also distributed even along gentle river floors in the southern lower flank of the volcano. The area of densely distributed debris slides, shallow debris slides, and debris flows is concordant with that of severe seismic tremor. Thus, genetic processes of landslides induced by the Iwate-Miyagi Nairiku Earthquake in 2008 are attributed to multiple causative factors such as geology, topography, and seismic force. Copyright 2009 Springer-Verlag

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Accession: 037035942

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DOI: 10.1007/s10346-009-0182-3


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