SERNAGEOMIN reported that during 27 June-4 July, visual observations of Chaitén were inhibited due to inclement weather. During 27-28 June, lahars descended multiple drainages and were especially notable in the Chaitén and Amarrillo rivers. On 30 June, an ash plume that rose to an altitude of 2.1 km (6,900 ft) a.s.l. was observed by means of a video camera in the city of Chaitén. A photograph of the new lava dome revealed that it completely covered the S side of the old lava dome. Lahar deposits were seen in the W part of the caldera and a drainage in the S caldera was blocked by rockfalls, causing small ponds to form. On 2 July, ash plumes that rose to altitudes of 4.1 km (13,500 ft) a.s.l. originated from a previously active area on the S flank and from a new area farther W. The plumes drifted N and NE.
Based on web camera views, SIGMET reports, observations of satellite imagery, pilot reports, and information from the Puerto Montt Flight Information Region (FIR), the Buenos Aires VAAC reported that during 2-3, 5, and 8 July ash plumes rose to altitudes of 2.1-4 km (7,000-13,000 ft) a.s.l. and drifted ENE, E, and SE.
Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Buenos Aires Volcanic Ash Advisory Center (VAAC) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”