Global Volcanism Program | Image GVP-04171
The summit crater of Momotombo is covered with areas of extensive hydrothermal alteration, including this area of sulfur deposition. Temperatures of 465-780° C were measured in summit crater fumaroles at the time of this visit in June 1980. Intense fumarolic activity occurs at the summit crater. The summit crater fumaroles remained very hot in late 1980 with temperatures measured up to 735°C and reported to > 900°C. Portions of the crater were seen to glow red and orange when observed at night.
Photo by Mike Carr, 1980 (Rutgers University).