Report on Gamkonora (Indonesia) — April 1987
Scientific Event Alert Network Bulletin, vol. 12, no. 4 (April 1987)
Managing Editor: Lindsay McClelland.
Gamkonora (Indonesia) Explosions, minor ashfall on flanks
Please cite this report as:
Global Volcanism Program, 1987. Report on Gamkonora (Indonesia) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 12:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198704-268040
1.38°N, 127.53°E; summit elev. 1635 m
All times are local (unless otherwise noted)
Since 6 April, Gamkonora had shown signs of restlessness. On 13 April, a dark plume, probably containing ash, was observed at 1130, reaching 700 m height. Small explosions occurred on 21, 24, 25, and 26 April, with reports of minor ashfall on the flanks. No plume heights were available, owing to poor weather. A VSI observer has been sent to Gamkonora.
Previous activity was reported on 16-17 February 1983.
Geological Summary. The shifting of eruption centers on Gamkonora, the highest peak of Halmahera, has produced an elongated series of summit craters along a N-S trending rift. Youthful-looking lava flows originate near the cones of Gunung Alon and Popolojo, south of Gamkonora. Since its first recorded eruption in the 16th century, typical activity has been small-to-moderate explosive eruptions. Its largest historical eruption, in 1673, was accompanied by tsunamis that inundated villages.
Information Contacts: VSI; T. Casadevall, USGS & VSI.