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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY


Weekly Update


Friday, September 28, 2007 12:00 PM AKDT (2000 UTC)




CLEVELAND VOLCANO (CAVW#1101-24-)

52°49'20" N169°56'42" W, Summit Elevation 5676 ft (1730 m)

Current Aviation Color Code: YELLOW

Current Volcano Alert Level: Advisory



Clouds obscured views of the Cleveland Volcano by satellite this week and AVO received no new information about activity at Cleveland this week. The AVO web camera used for viewing Cleveland Volcano from Nikolski ceased functioning on Monday, Sept. 10.



AVO continues to monitor the volcano closely with satellite imagery as weather allows. The lack of a real-time seismic network at Cleveland means that AVO is unable to track local earthquake activity related to volcanic unrest. Short-lived explosions of ash that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery.



Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about about 75 km (45 mi.) west of the community of Nikolski, and 1500 km (940 mi.) southwest of Anchorage. The volcano's most recent significant eruption began in February, 2001 and had 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. This eruption also produced a rubbly lava flow and hot avalanche that reached the sea. The most recent minor ash emissions were observed in October 2006.



PAVLOF VOLCANO (CAVW#1102-03-)

55°24'57" N161°53'24" W, Summit Elevation 8261 ft (2518 m)

Current Aviation Color Code: YELLOW

Current Volcano Alert Level: Advisory



Seismic activity at Pavlof Volcano has been at a low, almost background level throughout the past week. Cloudy conditions have obscured the volcano in satellite and web camera views this week. An AVO field crew visited the volcano last week and performed equipment maintenance, installed new broadband seismometers, and GPS equipment. Geologists sampled juvenile material and ash from the south flank of the volcano, and made various observations that confirmed that eruptive activity at the volcano had ceased. Small rock avalanches from the cooling lava flow were observed, but these traveled only a short distance beyond their source areas and did not extend beyond the lower flanks of the volcano. The drainage that was inundated by lahars during the eruption has returned to a near normal low-flow condition, and no anomalous streamflow behavior was observed.



The present period of low level of seismicity could indicate that the August-September eruption has ended. It is possible, however, that the volcano has entered a quiescent period within the current eruptive cycle, and that eruptive activity could resume over the next several weeks or months. Other historical eruptions of Pavlof have been characterized by periods of diminished activity followed by periods of low-level eruption and occasional explosive events. Renewed eruptive activity can begin at any time with little precursory seismicity. AVO continues to monitor the volcano closely.



Pavlof volcano is located on the southwestern end of the Alaska Peninsula. Pavlof is a stratovolcano which rises to an elevation of 8262 feet. With almost 40 historic eruptions, it is one of the most consistently active volcanos in the Aleutian arc. Eruptive activity is generally characterized by sporadic strombolian fountaining continuing for a several-month period.



AUGUSTINE VOLCANO (CAVW#1103-01-)

59°21'45" N153°26'6" W, Summit Elevation 4134 ft (1260 m)

Current Aviation Color Code: YELLOW

Current Volcano Alert Level: Advisory



Shallow, low-level seismic activity at Augustine Volcano has continued over the past week with occasional bursts or swarms of activity. Clear views of the volcano by satellite and web camera at various times throughout the week showed nothing unusual.



The earthquake activity this past week has been characterized by small, generally less than magnitude 1.0 earthquakes, located at shallow depth beneath the volcano's summit. While significant, the current earthquake activity is much less energetic than that which immediately preceded the explosive eruptions in January 2006. No thermal anomalies have been seen in satellite remote sensing data. The earthquakes that have been occurring could cause some disruption of the summit dome and this could cause rock fall and rock avalanche events on the flanks of the volcano. AVO will continue to monitor the situation closely.



OTHER ALASKA VOLCANOES



Seismic activity is monitored in real time at 31 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, Fourpeaked, Snowy, Griggs, Katmai, Novarupta, Trident, Mageik, Martin, Peulik, Ukinrek Maars, Aniakchak, Veniaminof, Dutton, Isanotski, Shishaldin, Fisher, Westdahl, Akutan, Makushin, Okmok, Korovin, Great Sitkin, Kanaga, Tanaga, and Gareloi volcanoes are at Aviation Color Code GREEN and Volcano Alert Level NORMAL. 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 volcano 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



Steve McNutt, Coordinating Scientist, UAF

steve@giseis.alaska.edu (907) 474-7131



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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