It was reported that during 3-9 September seismic activity from Kasatochi was low. Vigorous steam-and-gas plumes rose above the crater and drifted up to 32 km downwind. On 4 September the Volcano Alert Level was lowered to Advisory and the Aviation Color Code to Yellow. Weak thermal anomalies were detected on 5 and 7 September. [read all]

It was reported that during 13-19 August seismic activity from Kasatochi was detected by stations on Great Sitkin, about 40 km W. On 17 August, the smell of sulfur was reported in the town of Adak. [read all]

Three major explosive eruptions occured at Kasatochi between approximately 2230 UTC (14:30 AKDT) on 07 August and 0500 UTC on 08 August(2100 AKDT on 07 August). Ash from these explosions reached at least 45,000 ft above sea level. Ash emissions became continuous following the last explosive event and have produced a continuous ash cloud extending for more than 500 miles in a counterclockwise spiral. Ash from this continuous phase is likely at an altitude in excess of 35,000 ft above sea level. The possibility of larger explosive events continues. ...more [read all]

A subplinian or plinian eruption is taking place at Kasatochi volcano, a remote island in the Western Aleutian chain. AVO reports that satellite data show an ash plume to an altitude of at least 35,000 ft. in the vicinity of Kasatochi Volcano 22:30 UTC (14:30 ADT) on Aug. 7th, 2008. The plume is drifting to the south-southwest. ...more [read all]