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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

Information Release

Monday, September 18, 2006 2:20 PM AKDT (2220 UTC)




DOUGLAS VOLCANO (CAVW#1102-27-)

58°51'18" N153°32'31" W, Summit Elevation 7021 ft (2140 m)

Current Level of Concern Color Code: Not Assigned





FOURPEAKED VOLCANO (CAVW#1102-26-)

58°46'12" N153°40'19" W, Summit Elevation 6903 ft (2104 m)

Current Level of Concern Color Code: Not Assigned



On Sunday, September 17, AVO received several reports of two discrete plumes rising from the Cape Douglas area, about 200 miles (320 km) southwest of Anchorage, beginning at approximately 8:15 PM AKDT (0415 UTC, September 18) and continuing until darkness. Analysis of satellite images shows that the plumes originated in the area of Fourpeaked Glacier, located between Fourpeaked and Douglas volcanoes. Photographs of the plumes show that they reached up to approximately 20,000 ft (6,000 m) above sea level.



Satellite images show a cloud originating from Fourpeaked glacier area and persisting throughout the night. The cloud does not show an ash signature. The cloud traveled up to 12 miles (20 km) to the northeast.



Fourpeaked and Douglas volcanoes are not monitored seismically. Seismometers around the Katmai group of volcanoes, about 50 miles (80 km) to the southwest, and around Augustine volcano, 40 miles (64 km) to the north, did not record any unusual seismic activity. Based on the absence of an ash signature in the cloud in satellite data, a significant volcanic eruption did not occur. The origin of the two plumes is still unknown.



Poor weather in the area today prevents further visual observations. AVO will continue to monitor the area via satellite and local pilot reports. AVO will attempt an overflight of the area later this week.



Mount Douglas, a 2,140 m (7,020 ft) high stratovolcano, is located on the northern tip of the Alaska Peninsula, 320 km (200 mi) southwest of Anchorage. The summit of Mount Douglas has a small lake-filled crater, and an active fumarole field on the northeast crater wall. In 1982, the crater lake had a temperature of 25 degrees C (77 degrees F) and a pH of 1. Although Mount Douglas is dissected and eroded, lava flows on the northwest flank are relatively uneroded. Douglas has not experienced eruptive activity within historical times; the most recent eruption was in the early Holocene.



Fourpeaked Mountain lies within the northeast corner of Katmai National Park and Preserve on the Alaska Peninsula, 7.5 miles (12 km) southwest of Mount Douglas. It is the likely vent for Fourpeaked volcano, a stratovolcano that is mostly surrounded (and covered) by Fourpeaked Glacier. Small isolated volcanic exposures along ridge crests and cliff faces radiate out from the ice-covered summit. The last volcanic activity at Fourpeaked was probably greater than 10,000 years ago. No recent volcanic or hydrothermal activity has been identified.





ABBREVIATED COLOR CODE KEY (contact AVO for complete description):

GREEN volcano is dormant; normal seismicity and fumarolic activity occurring

YELLOW volcano is restless; eruption may occur

ORANGE volcano is in eruption or eruption may occur at any time

RED significant eruption is occurring or explosive eruption expected at any time



VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu

RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478



CONTACT INFORMATION:

Tom Murray, Scientist-in-Charge, USGS

tlmurray@usgs.gov (907) 786-7497



Chris Nye, Acting-Coordinating Scientist, DGGS

cnye@giseis.alaska.edu (907) 474-7430



The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.
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
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Page modified: May 27, 2014 10:23
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