Plumes rise above a line of fumaroles at Hulubelu volcano in SE Sumatra. Gunung Tangganus rises at the upper left, east of the North Hulubelu fumarole fields that are aligned NE of, and parallel to, the Great Sumatran Fault. Hulubelu, also spelled Ulubelu, is an elliptical, 4-km-long caldera in SE Sumatra. The ages of the latest eruptions are not known, although geothermal activity, mud volcanoes, and hot springs occur at several locations.

Anonymous, 1991.

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Keywords: fumarole

Ulubelu