Printer friendly versionALASKA VOLCANO OBSERVATORY INFORMATION STATEMENTWednesday, August 15, 2007 9:34 AM AKDT (Wednesday, August 15, 2007 17:34 UTC)PAVLOF VOLCANO
55°25'2" N 161°53'37" W, Summit Elevation 8261 ft (2518 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
Previous Aviation Color Code: YELLOW
Previous Volcano Alert Level: Advisory
AVO is raising the aviation color code for Pavlof Volcano from Yellow to ORANGE
and the Alert Level from Advisory to WATCH. AVO detected a strong thermal anomaly at the volcano overnight. Seismic activity continues to increase in both number of events per hour and duration of individual events.
These observations fit the pattern of activity prior to previous eruptions and we now expect an eruption similiar to those in 1996, 1986, 1981, and 1983 to occur in the next day to weeks.
The last eruption of Pavlof began in September, 1996 and was first reported by observers in Cold Bay. A several-month-long series of ash explosions, lava-fountaining, and lava-flow production ensued. Ash clouds reached as high as 30,000 ft ASL on one occasion, however, most ash clouds were below 20,000 ft ASL. Prior to 1996, Pavlof erupted in 1986 sending ash as high as 49,000 ft ASL on at least one occasion. A hazard assessment for Pavlof and the Emmons Lake volcanic center is available on the web at http://www.avo.alaska.edu/pdfs/SIR2006
AVO will be increasing its monitoring frequency for Pavlof while at this heightened level of unrest.
Pavlof volcano is located on the southwestern end of the Alaska Peninsula about 590 miles southwest of Anchorage. The community of Cold Bay is located 37 miles to the southwest of Pavlof. Pavlof is a steep-sided, symmetrical, 8261-ft-high stratovolcano. With almost 40 historic eruptions, it is one of the most active volcanoes in the Aleutian arc. Eruptive activity is generally characterized by sporadic lava fountaining continuing for a several-month period. Additional hazards in the vicinity of the volcano included light ash fall on nearby communities, mudflows, lava flows and avalanching of hot debris on the flanks of the volcano. For more information on Pavlof and potential volcano hazards, please see our web site: http://www.avo.alaska.edu/volcanoes/volcinfo.php?volcname=Pavlof