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Mount Unzen eruption of 1792, volcanic eruption of Mount Unzen, western Kyushu, Japan, that led to a destructive landslide and a tsunami. The death toll from the disaster is estimated at some 15,000 people, making it the most deadly volcanic eruption in Japan’s history. Mount Unzen actually consists of a group of composite volcanoes located on Japan’s Shimabara Peninsula east of Nagasaki. The area was the site of a major volcanic eruption in 1792. After...