Based on web camera views, SERNAGEOMIN reported that during 28 January-2 February Chaitén's Domo Nuevo 2 continued to grow and produce block-and-ash flows. On 28 January, a dense ash plume that rose 500 m above the lava dome was immediately followed by a block-and-ash flow that traveled W. The Alert Level remained Red.

Based on SIGMET notices and web camera views, the Buenos Aires VAAC reported that during 28 and 30-31 January, and 1 February ash plumes from Chaitén rose to altitudes 1.8-2.4 km (6,000-8,000 ft) a.s.l. and drifted E and NE.

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.

Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Buenos Aires Volcanic Ash Advisory Center (VAAC)