AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
Summary | Webcams | Webicorders | RSAM | Recent Earthquakes | Volcano Activity Notifications | Search Notifications | Cleveland
You are here: Home > Current Volcanic Activity

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

VENIAMINOF



There were no reports of activity at Veniaminof this week.



SHISHALDIN



On Thursday, pilot reported a steam plume up to 6000 feet above Shishaldin volcano. Observers from Izembeck National Wildlife Refuge reported a steam and ash plume up to 4000 feet above the summit and drifting to the southeast yesterday. Shishaldin is one of the most active volcanoes in the Aleutian arc and typically emits a steam plume to several thousand feet.



Shishaldin is located near the center of Unimak Island, about 50 mi southwest of Cold Bay. Highest of the Aleutian Island volcanoes, the nearly symmetric cone rises to 9400 ft. At least 27 eruptions have been reported since 1775, the last occurring March 1986-February 1987.



COOK INLET VOLCANOES



Seismic activity beneath Mt. Spurr remains low. The current level of concern color code is GREEN. Seismicity at Augustine, Redoubt and Iliamna volcanoes remains at normal levels.

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
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: June 11, 2012 11:50
Contact Information: AVO Web Team

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