Volcanologists of the Philippines Institute of Volcanology and Seismology examine the front of a slow-moving lava flow that is advancing down the SW flank of Mayon volcano in March 1993. The incandescent interiors of lava blocks are exposed as they tumble down the sides of the flow.

Photo by Philippine Institute of Volcanology and Seismology, 1993.

Keywords: lava flow | eruption | lava | field work | volcanologist | gas | ‘a’a | gas | degassing

Mayon