SERNAGEOMIN reported that during 2011 seismic activity from Chaitén remained low and that no growth of the lava-dome complex was detected. Visual observations indicated low emissions. The Alert Level was lowered to Green, Level 2, on a three-color scale.

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: Servicio Nacional de Geología y Minería (SERNAGEOMIN)