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Report on Gamalama (Indonesia) — 28 December-3 January 2012


Gamalama

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 28 December-3 January 2012
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2011. Report on Gamalama (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 28 December-3 January 2012. Smithsonian Institution and US Geological Survey.

Weekly Report (28 December-3 January 2012)

Gamalama

Indonesia

0.81°N, 127.3322°E; summit elev. 1714 m

All times are local (unless otherwise noted)


According to news articles, at least three people were killed and 1,000-2,600 more from several villages were displaced by lahars from Gamalama during on 27-28 December. The lahars destroyed many homes in the Tubo and Tofure villages and along the Togorara and Marikurubu rivers. The Alert Level remains at 3 (on a scale from 1-4).

Geological Summary. Gamalama is a near-conical stratovolcano that comprises the entire island of Ternate off the western coast of Halmahera, and is one of Indonesia's most active volcanoes. The island was a major regional center in the Portuguese and Dutch spice trade for several centuries, which contributed to the extensive documentation of activity. Three cones, progressively younger to the north, form the summit. Several maars and vents define a rift zone, parallel to the Halmahera island arc, that cuts the volcano; the S-flank Ngade maar formed after about 14,500–13,000 cal. BP (Faral et al., 2022). Eruptions, recorded frequently since the 16th century, typically originated from the summit craters, although flank eruptions have occurred in 1763, 1770, 1775, and 1962-63.

Sources: BBC News, The Jakarta Post