USGS Volcano Hazards Program Volcano Update

AVO update page and observatory web site

The eruption of Veniaminof continues and has been characterized during that past week by lava effusion and fountaining and production of nearly continuous small ash plumes that rise hundreds of feet above the active vent and are likely restricted to within a few miles of the caldera. The activity is evidenced by continuous seismic tremor, though the level of seismicity is currently lower than observed August 30 to September 2. During periods of clear weather, the view from the FAA webcam in Perryville shows the plume from the intracaldera cone. Elevated surface temperatures, consistent with lava effusion, have been detected over the past week in satellite images.

Ash fall from current activity is not expected to be significant and likely will be less than 1/16 inch, although areas within a few miles of the active cone could receive thicker amounts of ash fall. Information about volcanic ash and its potential effects can be found on the AVO web page (

Throughout the current eruption, which began in June 2013, the volcano has experienced fluctuating levels of lava effusion and ash emission. Eruptive activity could intensify at any time, leading to higher and more far travelled ash plumes.

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, November 2006, and February 2008. 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.

Update in Common Alerting Protocol (CAP) format