Semeru volcano — the tallest volcano on Java at 3,676 meters — erupted on the afternoon of November 19, 2025, with pyroclastic flows racing at high speed more than 8.5 kilometers down its slopes, as ...

A man looks at a pyroclastic flow during the eruption of Mount Semeru in Lumajang, East Java, on November 19, 2025. (Photo credit: AGUS HARIANTO/AFP via Getty Images) Authorities raised the volcano's ...

A pyroclastic flow (also known as a pyroclastic density current or a pyroclastic cloud) is a fast-moving current of hot gas and volcanic matter (collectively known as tephra) that flows along the ...

There has been no change in the safe distance or sectoral recommendations for potential dangers related to Mount Merapi activities over the last three days.

A powerful volcanic eruption in Indonesia sent residents fleeing as Mount Semeru released a towering ash column and pyroclastic flow - a fast-moving, superheated cloud of dense volcanic gas, ash and ...