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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. The increased level of seismicity that began on 24 September is still occurring. AVO staff doing airborne observations during the weekend reported low level incandescent fountaining. Small explosions in the summit crater produced sporadic small steam and ash plumes which rose as much as 2000 ft about the vent. The largest plume today drifted south for about 70 miles and appeared faintly on satellite images. An incandescent spatter-fed flow follows a deep gulley [sic] on the NW side of the volcano. AVO continues to monitor the volcano closely and will issue further Updates when the situation warrants. 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.



The nearest towns to the volcano are Cold Bay (37 mi),

King Cove (30 mi), Sand Point (60 mi), and Nelson Lagoon

(50 mi); these towns could expect light ash fall depending

on wind direction and continuing eruptive activity.

Mudflows and some flooding could be expected in the

Cathedral River valley north of the volcano. Airborne ash

hazards to aircraft may be considerable if a large

explosive event occurs but much less severe during a

typical Strombolian phase.

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].
PDF version of these definitions
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: June 11, 2012 11:50
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