Mount Ontake On September 14, 1984, the Otaki earthquake (magnitude 6.8) in Nagano Prefecture, Japan, caused a major mudslide on the south face of Mount Ontake, which reached speeds of 80~100 km/h. Heavy rain over several days prior to the quake contributed to causing the mudslide, known as “Ontake Kuzure,” which took the lives of 29 people. After the disaster, barriers against mudslide were erected in nine locations at the foot of Mt. Ontake Wakayama, Nara In September 2011, typhoon No. 12, which formed and was named on August 25, made landfall over Japan, bringing heavy rain to the mountainous Kii Peninsula, and causing a mudslide, called “Shinsohokai,” in Wakayama and Nara. "Shinsohokai" means that not only soil collapses, but also bedrock. In this case, houses were covered with earth and sand from the mudslide and there were many injured and killed. Hiroshima In June 2010, Hiroshima experienced heavy rains which ca...
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