Report on Gamalama (Indonesia) — 24 December-30 December 2014
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 24 December-30 December 2014
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2014. Report on Gamalama (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 24 December-30 December 2014. Smithsonian Institution and US Geological Survey.
0.8°N, 127.33°E; summit elev. 1715 m
All times are local (unless otherwise noted)
Based on satellite observations, ground reports, and wind data, the Darwin VAAC reported that during 24-25 December ash plumes from Gamalama rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted almost 30 km SW.
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 thorough documentation of Gamalama's historical 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. 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.