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Mount Sibayak

Singkut

Caldera · Indonesia · 2181 m

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. · Foto: Photo by Tom Casadevall, 1987 (U.S. Geological Survey). · Wikimedia Commons
Tipo
Caldera
Paese
Indonesia
Regione
Sunda e Banda / Sunda Volcanic Arc
Altitudine
2181 m
Coordinate
3.238, 98.513
Ultima eruzione
1881
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Caldera
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

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.

Sintesi da Wikipedia

Riassunto in inglese

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.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
1881~1881 · 1 eruzioni · VEI max. ?18811881188218821882

Cronologia dettagliata

  1. 1881VEI ?Osservata
    1881-07-02 – In corso

Link esterni

⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.