Two large earthquakes were followed by a collapse of the eastern flank of Mount Unzen's Mayuyama dome
Tuesday May 21, 1782 Shimabara Peninsula of Nagasaki Prefecture, Japan
On the night of 21 May, two large earthquakes were followed by a collapse of the eastern flank of Mount Unzen's Mayuyama dome, causing a landslide which swept through the city of Shimabara and into Ariake Bay, triggering a great tsunami.
