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ARCHIVED REPORT
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PAVLOF VOLCANO



LEVEL OF CONCERN COLOR CODE: ORANGE

LAST LEVEL OF CONCERN: ORANGE



A low-level eruption continues at Pavlof Volcano on the Alaskan Peninsula. On Tuesday, seismicity began to increase, indicating stronger eruption activity relative to the previous week. Visual observations and satellite data analyses, though hampered by poor weather, verified that increased seismicity can be correlated with eruption of ash and bombs several hundred to as much as 4,000 feet above the summit of the cone. On two occasions during the past week, satellite imagery has shown thin ash plumes as far as 45 km (30 miles) from the volcano.



Since the late 1700's, nearly 40 separate eruptions of

Pavlof Volcano are known to have occurred, making Pavlof

one of the most active volcanoes in Alaska. Recent

eruptions have been characterized by an early explosive

event that can propel ash to an altitude of over 10 km

(33,000 feet) above sea level. The eruptions then proceed

as intermittent, low-level Strombolian activity with

ejection of fluid lava spatter and small amount of ash and

incandescent bombs to heights of usually less than 1,000

feet above the cone. Spatter-fed lava flows and ash-rich

mudflows can also result from the accumulation of hot

material on the steep flanks of the volcano. This kind of

low-level activity could continue for many months,

punctuated by occasional more explosive events.



Pavlof is located 600 miles southwest of Anchorage on the

Alaska Peninsula. The nearest towns to the volcano are

Cold Bay (37 mi SW), King Cove (30 mi SW), Sand Point (60 mi E), and Nelson Lagoon (50 mi NE). These towns could expect light ash fall depending on wind direction and level of eruptive activity. Mudflows and some flooding could occur in the Cathedral River valley north of the volcano. The hazard to aircraft from airborne ash may be considerable if a large explosive event occurs, however during the more characteristic low-level activity currently in progress, this hazard is minor.



AVO maintains a six-station seismic network near the

volcano. Until further notice, we are maintaining 24-hour

staffing at the Observatory to monitor the situation.



AMUKTA VOLCANO



No further reports have been received regarding activity at Amukta Volcano in the Central Aleutian Islands.



ILIAMNA VOLCANO



The seismic swarm that began on 1 August 1996 beneath

Iliamna Volcano continued during the past week at an average rate of about 7 earthquakes per day. All events were beneath the volcanic cone. Magnitudes of most earthquakes were less than 1.0; maximum magnitude was 2.2. All earthquakes have been volcano-tectonic (VT); no long-period earthquakes or tremor that usually precede

volcanic eruptions have been observed. This seismicity is likely related to an intrusion of magma beneath Iliamna Volcano. Such an intrusion does not mean an eruption is imminent.



Seismic activity at Spurr, Redoubt, and Augustine

volcanoes remains at normal background levels.



ADDITIONAL INFORMATION



AVO maintains a computerized alarm system capable of

notifying AVO seismologists during non-business hours

should unusual seismic activity occur at Spurr, Iliamna,

Augustine, or Akutan volcanoes.



AVO continues to test new seismic networks at Dutton, Makushin, Akutan, and Katmai area volcanoes. Reports on these volcanoes will be added to the AVO weekly update as data acquisition and analysis become reliable. We anticipate that this will occur by mid-November.

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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