Printer friendly versionALASKA VOLCANO OBSERVATORY INFORMATION STATEMENTFriday, September 30, 2005 2:29 PM AKDT (Friday, September 30, 2005 22:29 UTC)VENIAMINOF VOLCANO
56°11'52" N 159°23'35" W, Summit Elevation 8225 ft (2507 m)
Current Volcano Alert Level:
Current Aviation Color Code: GREEN
Based on diminished seismicity and lack of evidence to suggest that minor ash explosions were continuing at Veniaminof volcano it appears that the most recent episode of activity has ended and the Level of Concern Color Code for Mount Veniaminof Volcano was downgraded from yellow to GREEN
on Wednesday of this week.
Mount Veniaminof volcano is an andesitic stratovolcano with an ice-filled 10-km diameter summit caldera located on the Alaska Peninsula, 775 km (480 mi) southwest of Anchorage and 35 km (22 mi) north of Perryville. Veniaminof is one of the largest (~ 300 km3) and most active volcanic centers in the Aleutian Arc and has erupted at least 13 times in the past 200 years. Recent significant eruptions of the volcano occurred in 1993-95 and 2005. Both were moderate Strombolian eruptions producing intermittent low-level jets of incandescent lava fragments, and low-level emissions of steam and ash from the main intracaldera cone. During the 1993-95 activity, a small lava flow was extruded into the summit caldera ice field producing an ice pit. Minor ash-producing explosions occurred in 2002, 2004, early 2005, and in recent weeks. Previous historical eruptions have produced ash plumes that reached 6,000 m (20,000 ft) above sea level and ash fallout that blanketed areas within about 40 km (25 mi) of the volcano.