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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

Weekly Update

Friday, December 1, 2006 4:10 PM AKST (110 UTC)




CLEVELAND VOLCANO (CAVW#1101-24-)

52°49'24" N169°56'35" W, Summit Elevation 5676 ft (1730 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



AVO has received no new reports of ash eruptions at Cleveland. However, clouds have obscured the volcano for much of the week. Based on recent activity at the volcano, it is likely that low-level unrest continues. Ash explosions to 20,000 feet (6 km) above sea level or higher can occur with little or no warning. The most recent well-documented explosive activity was on October 28.



Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about 45 miles (75 km) west of the community of Nikolski, and 940 miles (1500 km) southwest of Anchorage. The volcano's most recent significant eruption began in February, 2001 and comprised 3 explosive events that produced ash clouds as high as 39,000 feet (12 km) above sea level. This eruption also produced a rubbly lava flow and hot avalanche that reached the sea.



VENIAMINOF VOLCANO (CAVW#1102-07-)

56°11'44" N159°23'18" W, Summit Elevation 8225 ft (2507 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



Seismicity at Veniaminof remains low but above background. Views of the volcano in the AVO web camera this week showed a typical low-level steam plume above the intracaldera cone.



Intermittent, short-lived, very small-volume steam and ash bursts from the intracaldera cone have been common over the past few years. Ash from these events is not likely to extend beyond the caldera rim. There are no indications that a larger eruption is imminent.



Mount Veniaminof volcano is an andesitic stratovolcano with an ice-filled 10-km (6 mi) diameter summit caldera located on the Alaska Peninsula, 480 miles (775 km) southwest of Anchorage and 22 miles (35 km) north of Perryville. Veniaminof is one of the largest (~ 300 km3) and most active volcanic centers in the Aleutian Arc and has erupted at least 13 times in the past 200 years. Recent significant eruptions of the volcano occurred in 1993-95 and 2005. Both were moderate Strombolian eruptions producing intermittent low-level jets of incandescent lava fragments, and low-level emissions of steam and ash from the main intracaldera cone. During the 1993-95 activity, a small lava flow was extruded into the summit caldera ice field producing an ice pit. Minor ash-producing explosions occurred in 2002, 2004, early 2005, and 2006. Previous historical eruptions have produced ash plumes that reached 20,000 feet (6,000 m) above sea level and ash fallout that blanketed areas within about 25 miles (40 km) of the volcano.





KOROVIN VOLCANO (ATKA ISLAND) (CAVW#1101-16)

52°22'52" N174°9'15" W, Summit Elevation 5030 ft (1533 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



Seismicity at Korovin remains above background. Clouds prevented satellite views of the volcano the entire week.



Korovin Volcano is a 5030 foot-high (1553 m) stratovolcano located on the northern part of Atka Island in the central Aleutian Islands, about 110 miles (184 km) east of Adak, 350 miles (538 km) west of Dutch Harbor, and 1100 miles (1760 km) southwest of Anchorage. The volcano has two distinct summit vents about 2000 feet (0.6 km) apart, that have been the sites of eruptive activity as recently as June 1998. The most recently active of the vents maintains a small, roiling, lake that occasionally produces energetic steam emissions. Thermal springs and fumaroles located on and near the volcano indicate an active hydrothermal system. Korovin has erupted several times in the past 200 years, including 1907, 1951, 1953, 1954, 1973, 1976, 1986, 1987, 1996, and 1998. All of these eruptions produced minor amounts of ash and occasional but small lava flows. Reports of the height of the ash plume produced by the 1998 eruption ranged from 16,000 to 30,000 feet (4900 to 9200 m) above sea level.





FOURPEAKED VOLCANO (CAVW#1102-26-)

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

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



Vigorous fumarolic and low-level earthquake activity continue at Fourpeaked volcano. The AVO web camera during the week showed a persistent steam and volcanic gas plume rising at most a few thousand feet (several hundred meters) above the summit. The most recent airborne gas survey on November 18 showed no significant change from previous measurements.



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 in ridges and cliffs radiate out from the ice-covered summit. The age of the last eruption at Fourpeaked is not known.





OTHER ALASKA VOLCANOES



Seismic activity is monitored in real time at 30 volcanoes in Alaska. Satellite images of all Alaskan volcanoes are analyzed daily for evidence of ash plumes and elevated surface temperatures. Some volcanoes may currently display anomalous behavior but are not considered to be at a dangerous level of unrest. Wrangell, Spurr, Redoubt, Iliamna, Augustine, Snowy, Griggs, Katmai, Novarupta, Trident, Mageik, Martin, Peulik, Ukinrek Maars, Aniakchak, Pavlof, Dutton, Isanotski, Shishaldin, Fisher, Westdahl, Akutan, Makushin, Okmok, Great Sitkin, Kanaga, Tanaga, and Gareloi volcanoes are in color code GREEN. All are at or near normal levels of background seismicity. AVO did not detect ash plumes or significant elevated surface temperatures in the vicinity of any volcano.



Please see http://www.avo.alaska.edu/color_codes.php for complete definitions of Aviation color codes and Volcanic activity alert levels.



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



John Eichelberger, Coordinating Scientist, UAF

eich@gi.alaska.edu (907) 474-5530



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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