Global Volcanism Program | Image GVP-00680
Volcanologist Maurice Krafft measures the temperature of a sulfur-encrusted fumarole during a 1971 trip to the summit of Merapi volcano in central Java. Gas masks are essential when working around the toxic fumaroles. The temperatures of selected fumaroles on the summit of Merapi are measured regularly by the Volcanological Survey of Indonesia as a part of their program to monitor the hazardous volcano. Sumbing (left) and Sundoro (right) volcanoes appear on the distant horizon to the NW.
Copyrighted photo by Katia and Maurice Krafft, 1971.