A small crater lake near the summit of Sibayak volcano shows active fumaroles and sulfur mineralization. An active fumarole is visible at the upper left. The lake is popular destination for weekend climbers from villages and towns surrounding the volcano.

Photo by Tom Casadevall, 1987 (U.S. Geological Survey).

This image is made available as a Public Domain Work, but proper attribution is appreciated.

Keywords: sulfur | crater | emissions | mineral deposit | fumarole | geothermal

Singkut