The landslide, probably a pyroclastic flow of hot ash and debris, swept through the ancient Shimabara City, killing as many as 10,000 people. As debris plunged into the sea and tremors shook the ...

A pyroclastic flow is a deadly, fast-moving mix of superhot gases and volcanic matter. Shimabara Mayor Ryuzaburo Furukawa noted in a speech that the volcano is still unstable. “A 100-million ...