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LEVEL OF CONCERN COLOR CODE: ORANGE
LAST LEVEL OF CONCERN: ORANGE
The Strombolian eruption continues at Pavlof Volcano 60 km (37 mi) northeast of Cold Bay near the tip of the Alaska Peninsula. AVO staff observing the eruption from Cold Bay have returned to Anchorage with video of incandescent spatter fountaining from 2 vents in the crater and an incandescent spatter-fed flow extending down a deep gully on the NW side of the volcano. Clouds obscured the view of the volcano today from Cold Bay. The level of seismicity characteristic of the past week (beginning 24 Sept.) continues, and is consistent with the level of eruptive activity recently observed, which will likely continue for weeks or months. The Level of Concern Color Code will remain at Orange and AVO will continue to monitor the volcano closely. Further updates will be issued if the situation changes or as new information becomes available. AVO operates a seismic network of six stations near the volcano.
Pavlof Volcano, perhaps the most active volcano in the
Aleutian volcanic arc, has a history of 3-8 year-long
periods of repose between eruptions. A new eruption is
then marked by an initial strong explosive event that can
send an ash plume to over 10 km (33,000 feet) above sea
level. The eruptive phase then changes to sporadic
Strombolian eruption of lava spatter and small amounts of
ash; this part of the eruption typically consists of
rhythmic ejection of incandescent bombs and ash to heights
of 200-300 m above the cone. Spatter-fed lava flows
emanate from the summit vent on occasion.