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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

WEEKLY UPDATE

Friday, August 6, 2004 11:55 AM ADT (1955 UTC)



ALASKA VOLCANOES



MOUNT SPURR VOLCANO (CAVW#1103-04)

6118' N 15215' W, Summit Elevation 11,070 ft (3,374 m)

Current Level of Concern Color Code: YELLOW



Elevated levels of seismicity continue to be recorded at Mt. Spurr volcano

and approximately 10-20 earthquakes have been recorded daily beneath the

summit of Mt. Spurr. This level of activity has remained relatively

constant for the last several weeks. Although this represents a notable

increase over background seismicity levels, there are no indications that

an eruption is imminent. Often this type of seismic activity will decline

without producing an eruption. Aerial observations of Mt. Spurr made by AVO

staff this week indicate the presence of a circular collapse pit in the

snow/ice cover, approximately 50 x 75 meters (approximately 160 x 250 feet)

in diameter on the northeast flank of the Mt. Spurr summit dome at

approximately 3110 m (10,200 feet) ASL. The collapse pit appeared to

contain standing water of indeterminable depth. Arc-shaped scarps and small

translational slumps in the ice and snow cover around the summit dome also

were observed. These features and the collapse pit may indicate an increase

in heat flux through the summit dome that could be related to the intrusion

of magma at depth. During the week, AVO received photographs of the Mt.

Spurr summit taken on June 20, 2004 that do not show a collapse pit, but do

indicate the presence of an arc-shaped scarp in the area where the present

collapse pit has formed.

AVO will continue to monitor activity at Mount Spurr closely using seismic data, satellite images, and overflights, and will issue further information releases as appropriate.



Mt. Spurr volcano is an ice- and snow-covered stratovolcano located on the

west side of Cook Inlet. The only known historical eruptions occurred in

1953 and 1992 from the Crater Peak flank vent located 3.5 km (2 mi) south

of the summit of Mt. Spurr. These eruptions were explosive, brief in

duration, and produced towering columns of ash that rose up to 20 km

(65,000 ft) above sea level and deposited several mm of ash on populated

areas of south-central Alaska, including approximately 6 mm of ash on

Anchorage in 1953. The summit of Mt. Spurr and the surrounding avalanche

caldera is heavily mantled by ice and snow. The last known eruption from

the summit dome of Mt. Spurr was more than 5,000 years ago. The primary

hazards associated with future eruptions from the Mt. Spurr summit vent and

from Crater Peak include far-traveled ash clouds, ash fall, pyroclastic

flows, and lahars or mudflows that could inundate drainages all sides of

the volcano, but primarily on the south and east flanks.





MOUNT VENIAMINOF VOLCANO (CAVW #1102-07)

5610'N 15923'W, Summit Cone Elevation 7,073 ft (2,156 m)

Current Level of Concern Color Code: YELLOW



Episodes of volcanic tremor continue intermittently at Mount Veniaminof

Volcano. No visual observations of ash emissions have been made since July

22, although the observed seismicity is similar to that observed coincident

with ash emissions in the past few months. Most such emissions do not

extend more than 10,000 ft. (3048 m) above sea level, though a few have

been reported to reach as high as 12,000 ft. (3657 m). Satellite views of

the volcano were obscured by clouds throughout the week. The intracaldera

cone was occasionally visible in the AVO web camera, but only occasional

low-level steam plumes were evident. Activity at Veniaminof could become

more vigorous without warning, and continuing steam and ash emissions do

pose a hazard to people and low-flying aircraft in the vicinity of the

caldera. AVO will continue to monitor activity at Veniaminof using seismic

data, satellite images, Internet camera data and observer reports.



Mount Veniaminof volcano is a young stratovolcano with an ice-filled 10-km

(6 mi) diameter summit caldera located on the Alaska Peninsula, 775 km (480

mi) southwest of Anchorage and 35 km (22 mi) north of Perryville.

Veniaminof is one of the largest and most active volcanic centers in the

Aleutian Arc and has erupted at least 12 times in the past 200 years. The

most recent significant eruption of the volcano occurred in 1993-95 and was

characterized by intermittent, low-level emissions of steam and ash, and a

small lava flow onto the summit caldera ice field producing an ice pit.

Previous historical eruptions have produced ash plumes that reached 6,000 m

(20,000 ft) above sea level and associated ash fall within about 40 km (25

mi) of the volcano. Minor ash emissions similar to those occurring at

present were also detected in late 2002.





SHISHALDIN VOLCANO (CAVW #1101-36)

5445'N 16358'W, Summit Cone Elevation 9,373 ft (2,857 m)

Current Level of Concern Color Code: YELLOW



Low-level seismic tremor continues to be recorded at Shishaldin Volcano.

This level of activity is similar to that observed over the past several

months. We see nothing at this time to indicate that more vigorous activity

is imminent. However, activity at Shishaldin could increase rapidly and ash

and gas emissions may pose a hazard to people and low-flying aircraft in

the vicinity of the summit. AVO will continue to monitor activity at

Shishaldin Volcano using seismic data, satellite images, and observer

reports.



Shishaldin Volcano, located near the center of Unimak Island in the eastern

Aleutian Islands, is a spectacular symmetric cone with base diameter of

approximately 10 miles (16 km). A small summit crater typically emits a

noticeable steam plume with occasional small amounts of ash. Shishaldin is

one of the most active volcanoes in the Aleutian volcanic arc, erupting at

least 28 times since 1775. Most of Shishaldin's eruptions have consisted of

small ash and steam plumes, although the most recent eruption in April-May

1999 produced an ash column that reached a height of 45,000 ft above sea

level.





OTHER ALASKA VOLCANOES



Seismic activity is monitored in real time at 27 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, Redoubt, Iliamna, Augustine, Snowy, Griggs, Katmai, Novarupta,

Trident, Mageik, Martin, Aniakchak, Pavlof, Dutton, Isanotski, 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.



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



Jeff Freymueller, Acting Coordinating Scientist, UAF-GI

jeff@giseis.alaska.edu (907) 474-7286



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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