Report on Gamalama (Indonesia) — 7 May-13 May 2008
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 7 May-13 May 2008
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2008. Report on Gamalama (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 7 May-13 May 2008. Smithsonian Institution and US Geological Survey.
0.8°N, 127.33°E; summit elev. 1715 m
All times are local (unless otherwise noted)
CVGHM raised the Alert Level for Gamalama to 2 (on a scale of 1-4) on 11 May based on seismicity and visual observations during 10-11 May. On 10 May, white to gray plumes rose to an altitude of 1.8 km (5,900 ft) a.s.l. and drifted N. Residents and tourists were not permitted within 2 km of the summit.
Geologic Background. 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.