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Mount Sibayak

Singkut

Caldera · Indonesia · 2181m

Sibayak and Mt. Pinto are located within the Singkut caldera in NE Sumatra. The slightly higher Pinto partially overtops the 900-m-wide crater of Sibayak to the N. The summit contains a lava dome and an area of hydrothermal alteration visible in this photo. An ash eruption from Sibayak was recorded in 1881, and nearby residents have legends of eruptions.
Sibayak and Mt. Pinto are located within the Singkut caldera in NE Sumatra. The slightly higher Pinto partially overtops the 900-m-wide crater of Sibayak to the N. The summit contains a lava dome and an area of hydrothermal alteration visible in this photo. An ash eruption from Sibayak was recorded in 1881, and nearby residents have legends of eruptions. · Photo: Photo by Tom Casadevall, 1987 (U.S. Geological Survey). · Wikimedia Commons
Type
Caldera
Country
Indonesia
Region
Sunda & Banda / Sunda Volcanic Arc
Elevation
2181m
Coordinates
3.238, 98.513
Last eruption
1881
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Caldera
Major rock type
Andesite / Basaltic Andesite
Geological summary

The Quaternary Singkut caldera is about 7 x 4 km with the S half of the rim topographically distinct. Post-caldera cones have filled much of the crater and the N rim, including Sibayak, Pintau, and Pratektekan. The 900-m-wide Sibayak crater is partially filled on the north by Pintau. A lava flow traveled through a gap in the western crater wall from the summit lava dome of Sibayak; the active geothermal field SE of the summit has abundant solfataras and fumaroles. Area residents record legends of eruptions. Neumann van Padang (1983) cited a report by Hoekstra of ash clouds emitted from the volcano in 1881. The town of Berastagi is within the caldera immediately SE of the younger cones.

From Wikipedia

Mount Sibayak is a stratovolcano overlooking the town of Berastagi in northern Sumatra, Indonesia. Although its last eruption was more than a century ago, geothermal activity in the form of steam vents and hot springs remains high on and around the volcano. The vents produce crystalline sulfur, which was mined on a small scale in the past. Seepage of sulfurous gases has also caused acidic discolouration of the small crater lake.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1881~1881 · 1 eruptions · max VEI ?18811881188218821882

Detailed timeline

  1. 1881VEI ?Observed
    1881-07-02 – Ongoing

External links

⚠ For reference only. Not for emergency response.