Report on Dukono (Indonesia) — August 1991
Bulletin of the Global Volcanism Network, vol. 16, no. 8 (August 1991)
Managing Editor: Lindsay McClelland.
Dukono (Indonesia) Explosions and glow; ashfall to coast; small lahars
Please cite this report as:
Global Volcanism Program, 1991. Report on Dukono (Indonesia). In: McClelland, L (ed.), Bulletin of the Global Volcanism Network, 16:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199108-268010.
1.693°N, 127.894°E; summit elev. 1229 m
All times are local (unless otherwise noted)
People living near the volcano reported that a new eruption began during the night of 8-9 June, after nine years of relative quiet. At the onset of the eruption, residents were awakened by rumblings and a red glow from the volcano, which has since remained active. Ashfalls have occurred regularly in coastal towns 15 km NNW to 15 km ENE of the summit (Galela, Mamoya, and Tobelo). When visited by a geologist on 23-28 June, small to moderate explosions occurred every 4-5 minutes, sometimes accompanied by noise and night glow. Small lahars occurred in rivers draining the volcano.
Space Shuttle astronauts photographed an apparently ash-rich plume extending ~30 km from the summit to slightly beyond the coast on 15 September at 2156 (photos STS048-110-34 & 35). The entire summit area appeared ash-covered.
|Figure 1. Photograph of Dukono taken from the Space Shuttle, 2156 on 15 September 1991. The summit area appears to be covered with ash, and the plume extends ~30 km W from the summit. Courtesy of NASA-SSEOP; photo STS048-110-35.|
Geologic Background. Reports from this remote volcano in northernmost Halmahera are rare, but Dukono has been one of Indonesia's most active volcanoes. More-or-less continuous explosive eruptions, sometimes accompanied by lava flows, occurred from 1933 until at least the mid-1990s, when routine observations were curtailed. During a major eruption in 1550, a lava flow filled in the strait between Halmahera and the north-flank cone of Gunung Mamuya. This complex volcano presents a broad, low profile with multiple summit peaks and overlapping craters. Malupang Wariang, 1 km SW of the summit crater complex, contains a 700 x 570 m crater that has also been active during historical time.
Information Contacts: V. Clavel and P. Vetsch, SVG, Switzerland; C. Evans, NASA-SSEOP.