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
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DOI：
10.1007/s10346-009-0182-3
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发表时间：
2009-10
期刊：
影响因子：
6.7
通讯作者：
H. Yagi;G. Sato;D. Higaki;Miki Yamamoto;Takanari Yamasaki
中科院分区：
文献类型：
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作者：
H. Yagi;G. Sato;D. Higaki;Miki Yamamoto;Takanari Yamasaki
2008年岩手县-宫城县发生的地震烈度为日本气象厅(JMA)7.2级地震，在山体南侧引发了数不清的滑坡。栗马火山分布在日本东北部的欧脊山脉。大多数滑坡都是在地震断层的上盘一侧探测到的。这些滑坡分为五种类型：深部滑坡、泥石流、浅层泥石流、次生浅层泥石流和泥石流。地震引起的最常见的滑坡类型是浅层泥石流和随后的泥石流。它们密集分布在陡峭的峡谷中，切割着山体的火山边缘。库里科马，由更新世时代的焊接褐沸岩组成。泥石流甚至还分布在火山南部下侧的平缓河床上。泥石流、浅层泥石流和泥石流密集分布的区域与强震的区域是一致的。因此，2008年岩门-宫城奈良地震引发的滑坡的成因过程是由地质、地形和地震力等多种因素引起的。
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.