Steam rises from a pyroclastic flow deposit on the NW flank of Ulawun in February 1970. Rainforest trees were blown down facing away from the volcano by a high-velocity pyroclastic surge at the margins of the 22 January pyroclastic flow, which traveled 5 km from the summit. Pyroclastic flow velocities on the upper part of the volcano were estimated to exceed 100 km/hour.

Photo by Robert Citron, 1970 (Smithsonian Institution; courtesy of William Melson)

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Galleries: Pyroclastic Flows

Keywords: pyroclastic flow | environmental impact | steam | gas | deposit

Ulawun