Report on Gamalama (Indonesia) — April 1992
Bulletin of the Global Volcanism Network, vol. 17, no. 4 (April 1992)
Managing Editor: Lindsay McClelland
Gamalama (Indonesia) Dense steam emission and earthquakes
Please cite this report as:
Global Volcanism Program, 1992. Report on Gamalama (Indonesia). In: McClelland, L (ed.), Bulletin of the Global Volcanism Network, 17:4. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.BGVN199204-268060.
0.8°N, 127.33°E; summit elev. 1715 m
All times are local (unless otherwise noted)
Dense steam emissions continued through mid-Apr, rising 50-300 m above the crater rim. Earthquakes averaged 12-13/day in mid-Apr, an increase from early April, but only half the early March rate (17:02).
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.
Information Contacts: W. Modjo, VSI; UPI.