AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
Summary | Webcams | Webicorders | RSAM | Activity Notifications | Notification Search | Cleveland | Shishaldin | Pavlof | Semisopochnoi 
You are here: Home > Current Volcanic Activity > Archived Volcano Activity Notifications

AVO Archived Volcano Activity Notifications

2007
December
November
October
September
August
July
June
May
April
March
February
January
2006
December
November
October
September
August
July
June
May
April
March
February
January
2005
December
November
October
September
August
July
June
May
April
March
February
January
2004
December
November
October
September
August
July
June
May
April
March
February
January
2003
2002
2001
2000
1999
1998
1997
1996
December
November
October
September
August
July
June
May
April
March
February
January
1995
1994
1993
1992
December
November
October
September
August
July
June
May
April
March
February
January
1991
1990
1989
ARCHIVED REPORT
Printer friendly version

ALASKA VOLCANO OBSERVATORY

WEEKLY UPDATE

Friday, April 4, 2003 10:30 AM AST (1930 UTC)



MT. 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



Seismic activity dramatically decreased at Mt. Veniaminof during the past

week. However, short periods of volcanic tremor and low frequency events

are still present at the volcano. Low-level steaming and minor ash

emissions may occur at any time. Satellite images observed during the last

week did not reveal any elevated surface temperatures, ash emissions or ash

deposits at the volcano.



The level of concern color code for Mt. Veniaminof will remain YELLOW. AVO

continues to monitor the situation closely, and will issue further updates

as information becomes available.



Mt. Veniaminof volcano is an andesitic stratovolcano with an ice-filled,

10-km 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 volcanoes in the Aleutian

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

recent eruption occurred in 1993-95 and came from an intracaldera cinder

and spatter cone in the northwest sector of the caldera. The eruption was

Strombolian and characterized by intermittent, low-level emissions of steam

and ash and production of a small lava flow that melted a pit in the

caldera ice field. Previous historical eruptions have produced ash plumes

that reached 6,000 m (20,000 ft) above sea level and ash fall that affected

areas within about 40 km (25 mi) of the volcano.





For additional information and photographs of recent historical eruptions

at Veniaminof, please visit our web site:

http://www.avo.alaska.edu/avo4/atlas/Veniaminof.htm



ALASKA VOLCANOES

Seismic activity is monitored in real time at 24 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, Aniakchak,

Pavlof, Dutton, Isanotski, Shishaldin, Fisher, Westdahl, Akutan, Makushin,

Great Sitkin, and Kanaga 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



John Eichelberger, Coordinating Scientist, UAF-GI

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
Contact AVO Privacy Accessibility Information Quality FOIA
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS