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Report on Gamkonora (Indonesia) — 3 July-9 July 2013

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 3 July-9 July 2013
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2013. Report on Gamkonora (Indonesia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 3 July-9 July 2013. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (3 July-9 July 2013)


Gamkonora

Indonesia

1.38°N, 127.53°E; summit elev. 1635 m

All times are local (unless otherwise noted)


CVGHM reported that observers at the Gamkonora observation post in Gamsungi (6 km NW), West Halmahera, reported that during 27 May-30 June diffuse white plumes rose up to 300 m above the crater rim. Seismicity declined overall, but a seismic crisis characterized by continuous tremor was detected on 10 June; tremor was not detected during 13-30 June. The Alert Level was lowered to 2 (on a scale of 1-4) on 1 July. Residents and tourists were asked not to venture near the crater within a radius of 1.5 km.

Geologic Background. 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.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)