Chiginagak volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 24 August-30 August 2005 (New Activity / Unrest)
AVO reported that a 400-m-wide "melt-water lake" formed in the snow-and-ice filled summit crater of Chiginagak sometime after the previous observation in August 2004. Earlier this summer, the southern crater rim of Chiginagak was breached, allowing a portion of the lake to drain. The resulting lahar left a deposit on a glacier draining the crater to the S and caused flooding of 1-2 m above normal at Indecision Creek.
Wed, 24 Aug 2005, 06:0006:00 AM | BY: VN
The breach in the crater rim and the ensuing lahar probably occurred in July 2005; there were reports from a nearby lodge at this time of strong sulfur smells and cloudy, yellowish water in the Indecision Creek drainage. There were no indications that an eruption is imminent or that this event is necessarily precursory to an eruption. Chiginagak is not seismically monitored, so AVO did not assign it a Concern Color Code.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
From: Global Volcanism Program, 2005. Report on Chiginagak. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 24 August-30 August 2005. Smithsonian Institution and US Geological Survey.