Satellite image showing ash deposits on the upper east flank of Korovin Volcano in 2004. Intermittent, minor phreatic eruptions through a hot, roiling lake in the south summit crater of Korovin are the probable source. July 4, 2004, Ikonos near- infrared color composite, Copyright Space Imaging LLC.
McGimsey and others (2008) and Neal and others (2009) detail satellite imagery and field observations of ash on the upper east flank of Korovin volcano in late June - early July, 2004, likely from a small phreatic eruption of Korovin prior to late June.