Report on Chaiten (Chile) — 17 June-23 June 2009

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 17 June-23 June 2009
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2009. Report on Chaiten (Chile). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 17 June-23 June 2009. Smithsonian Institution and US Geological Survey.

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Chaiten

Chile

42.833°S, 72.646°W; summit elev. 1122 m

All times are local (unless otherwise noted)


As noted in an OVDAS-SERNAGEOMIN report, eruptive activity continued during 8-16 June with sustained growth of the lava dome complex, from which block-and-ash flows were generated. Steam-and-ash plumes generally rose 1.5 km above the dome. Seismicity remained at typical levels. The Alert Level remained at Red.

Geologic Background. Chaitén is a small, glacier-free caldera with a compound Holocene lava dome located 10 km NE of the town of Chaitén on the Gulf of Corcovado. Early work had identified only a single explosive eruption during the early Holocene prior to the major 2008 eruption, but later work has identified multiple explosive eruptions throughout the Holocene. 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 prehistorical 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 historical eruption, beginning in 2008, produced major rhyolitic explosive activity and growth of a lava dome that filled much of the caldera.

Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)