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Report on Chaiten (Chile) — 28 July-3 August 2010


Chaiten

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 28 July-3 August 2010
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2010. Report on Chaiten (Chile) (Sennert, S, ed.). Weekly Volcanic Activity Report, 28 July-3 August 2010. Smithsonian Institution and US Geological Survey.

Weekly Report (28 July-3 August 2010)

Chaiten

Chile

42.8349°S, 72.6514°W; summit elev. 1122 m

All times are local (unless otherwise noted)


Based on analyses of satellite imagery and web camera footage, the Buenos Aires VAAC reported that a plume from Chaitén's lava-dome complex drifted 20 km ENE on 30 July. An 18-km-wide ash plume also drifted 45 km ESE.

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.

Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)