SHIMABARA, Nagasaki Prefecture--Locals gathered here on June 3 to commemorate the massive eruption of Mount Unzen’s Fugendake ... mix of superhot gases and volcanic matter.

Deadly volcanic activity in Japan in recent years includes the 1993 eruption of Mount Unzen’s Fugendake and the 2014 eruption of Mount Ontakesan in central Japan. Both incidents killed dozens of ...

Volcanic gases, including sulfur dioxide ... Accounts of the day tell of a massive avalanche of rock that hurled down Unzen's Mount Mayuyama. The landslide, probably a pyroclastic flow of hot ...