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ARCHIVED REPORT
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PAVLOF VOLCANO



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.

VOLCANO ALERT LEVELS
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.

AVIATION COLOR CODES
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].

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Page modified: May 27, 2014 10:23
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