Report on Chaiten (Chile) — 12 November-18 November 2008
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 12 November-18 November 2008
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2008. Report on Chaiten (Chile) (Sennert, S, ed.). Weekly Volcanic Activity Report, 12 November-18 November 2008. Smithsonian Institution and US Geological Survey.
42.8349°S, 72.6514°W; summit elev. 1122 m
All times are local (unless otherwise noted)
Based on observations of satellite imagery, SIGMET notices, and web camera views, the Buenos Aires VAAC reported that during 12-17 November ash plumes from Chaitén continuously rose to altitudes 1.4-3.7 km (4,500-12,000 ft) a.s.l. and drifted NW, NNE, ENE, and E. A thermal anomaly was detected on satellite imagery on 12 November.
Geological Summary. Chaitén is a small caldera (~3 km in diameter) located 10 km NE of the town of Chaitén on the Gulf of Corcovado. Multiple explosive eruptions throughout the Holocene have been identified. A rhyolitic obsidian lava dome occupies much of the caldera floor. Obsidian cobbles from this dome found in the Blanco River are the source of artifacts from archaeological sites along the Pacific coast as far as 400 km from the volcano to the N and S. The caldera is breached on the SW side by a river that drains to the bay of Chaitén. The first recorded eruption, beginning in 2008, produced major rhyolitic explosive activity and building a new dome and tephra cone on the older rhyolite dome.