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

VOLCANO ACTIVITY NOTIFICATIONS

2015
August (1 report)
July (33 reports)
June (31 reports)
May (34 reports)
April (30 reports)
March (32 reports)
February (28 reports)
January (32 reports)
2014
December (31 reports)
November (35 reports)
October (32 reports)
September (32 reports)
August (31 reports)
July (33 reports)
June (36 reports)
May (32 reports)
April (30 reports)
March (32 reports)
February (30 reports)
January (35 reports)
2013
December (33 reports)
November (31 reports)
October (34 reports)
September (32 reports)
August (34 reports)
July (32 reports)
June (37 reports)
May (36 reports)
April (30 reports)
March (35 reports)
February (30 reports)
January (33 reports)
2012
December (31 reports)
November (32 reports)
October (31 reports)
September (31 reports)
August (32 reports)
July (31 reports)
June (32 reports)
May (32 reports)
April (30 reports)
March (35 reports)
February (29 reports)
January (9 reports)
2011
December (27 reports)
November (31 reports)
October (31 reports)
September (30 reports)
August (31 reports)
July (15 reports)
June (4 reports)
May (4 reports)
April (5 reports)
March (31 reports)
February (28 reports)
January (31 reports)
2010
December (31 reports)
November (30 reports)
October (31 reports)
September (30 reports)
August (9 reports)
July (5 reports)
June (14 reports)
May (9 reports)
April (13 reports)
March (4 reports)
February (4 reports)
January (10 reports)
2009
December (9 reports)
November (9 reports)
October (25 reports)
September (31 reports)
August (29 reports)
July (35 reports)
June (34 reports)
May (37 reports)
April (34 reports)
March (58 reports)
February (30 reports)
January (39 reports)
2008
December (32 reports)
November (32 reports)
October (36 reports)
September (32 reports)
August (46 reports)
July (45 reports)
June (30 reports)
May (32 reports)
April (33 reports)
March (35 reports)
February (37 reports)
January (35 reports)
2007
2006
2005

Older reports can be found here.

Report Text
Printer friendly version

AVO/USGS Volcanic Activity Notice

Volcano: Okmok (CAVW #1101-29-)

Current Volcano Alert Level: WARNING

Current Aviation Color Code: RED

Issued: Saturday, July 12, 2008, 9:28 PM AKDT (20080712/0528Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A8
Location: N 53 deg 23 min W 168 deg 9 min
Elevation: 3520 ft (1073 m)
Area: Aleutians Alaska

Volcanic Activity Summary: A strong explosive eruption began at approximately 1943 Z (11:43 AM ADT) and continues at this time based on high levels of seismicity recorded on the AVO seismic network. Seismicity reached a peak at about 2200 Z (2:00 PM ADT) and has been gradually declining since. The main mass of the ash cloud is at least 35,000 feet above sea level and is moving generally southeast from the volcano, with lesser amounts of ash moving eastward. Ash fall has been reported on eastern Umnak Island and in Unalaska/Dutch Harbor.

Recent Observations:
[Volcanic cloud height] The ash cloud is reaching in excess of 35,000 ft above sea level. Light winds appear to be carrying the ash cloud to the southeast and east at this time.
[Ash fall] Ash fall was reported soon after the eruption onset at Fort Glenn 7 miles southeast of the volcano. Ash fall began at Unalaska/Dutch Harbor at 3:45 pm ADT and is reportedly tapering off. Preliminary reports indicate only a light dusting has fallen so far.
[Other observations] U.S. Coast Guard aircraft in the area reported ash to at least 35,000 feet at 0130 Z on 13 July (5:30 PM ADT 12 July).

Hazard Analysis:
[General hazards] Ash fall is expected to continue downwind of the volcano including over marine areas in the North Pacific. Areas in the immediate vicinity of the volcano on Umnak Island should be avoided, particularly the Crater Creek drainage northeast of the caldera.
[Ash cloud] An ash cloud is drifting southeast and east of the volcano and poses a risk to aircraft in the vicinity. The estimated cloud height for the ash cloud is in excess of 35,000 ft above sea level.
[Ballistics] Ballistics may impact the areas around the caldera rim.
[Lava flow/dome] Historical eruptions of Okmok have typically produced lava flows, however at this time we cannot confirm that a lava flow has been produced.

Remarks: Okmok Volcano is located on the northeast end of Umnak Island in the eastern Aleutians about 65 miles southwest of Unalaska/Dutch Harbor. The volcano consists of a 6-mile-wide circular caldera or crater about 1600 feet deep that formed about 2000 years ago. Okmok has been frequently active in historical times producing ash clouds often accompanied by lava flows within the caldera. The most recent eruption occurred in 1997 and produced ash clouds and a lava flow that traveled about 5 miles across the caldera floor.

Please see http://www.avo.alaska.edu/activity/Okmok.php for more information.

Contacts: Steve McNutt, Coordinating Scientist, UAF
steve@giseis.alaska.edu (907) 474-7131

John Power, Acting Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Next Notice: More information will be released as it is received.
A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at http://www.avo.alaska.edu

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.


AVO/USGS Volcanic Activity Notice

Volcano: Okmok (CAVW #1101-29-)

Current Volcano Alert Level: WARNING

Current Aviation Color Code: RED

Issued: Saturday, July 12, 2008, 9:28 PM AKDT (20080712/0528Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A8
Location: N 53 deg 23 min W 168 deg 9 min
Elevation: 3520 ft (1073 m)
Area: Aleutians Alaska

Volcanic Activity Summary: A strong explosive eruption began at approximately 1943 Z (11:43 AM ADT) and continues at this time based on high levels of seismicity recorded on the AVO seismic network. Seismicity reached a peak at about 2200 Z (2:00 PM ADT) and has been gradually declining since. The main mass of the ash cloud is at least 35,000 feet above sea level and is moving generally southeast from the volcano, with lesser amounts of ash moving eastward. Ash fall has been reported on eastern Umnak Island and in Unalaska/Dutch Harbor.

Recent Observations:
[Volcanic cloud height] The ash cloud is reaching in excess of 35,000 ft above sea level. Light winds appear to be carrying the ash cloud to the southeast and east at this time.
[Ash fall] Ash fall was reported soon after the eruption onset at Fort Glenn 7 miles southeast of the volcano. Ash fall began at Unalaska/Dutch Harbor at 3:45 pm ADT and is reportedly tapering off. Preliminary reports indicate only a light dusting has fallen so far.
[Other observations] U.S. Coast Guard aircraft in the area reported ash to at least 35,000 feet at 0130 Z on 13 July (5:30 PM ADT 12 July).

Hazard Analysis:
[General hazards] Ash fall is expected to continue downwind of the volcano including over marine areas in the North Pacific. Areas in the immediate vicinity of the volcano on Umnak Island should be avoided, particularly the Crater Creek drainage northeast of the caldera.
[Ash cloud] An ash cloud is drifting southeast and east of the volcano and poses a risk to aircraft in the vicinity. The estimated cloud height for the ash cloud is in excess of 35,000 ft above sea level.
[Ballistics] Ballistics may impact the areas around the caldera rim.
[Lava flow/dome] Historical eruptions of Okmok have typically produced lava flows, however at this time we cannot confirm that a lava flow has been produced.

Remarks: Okmok Volcano is located on the northeast end of Umnak Island in the eastern Aleutians about 65 miles southwest of Unalaska/Dutch Harbor. The volcano consists of a 6-mile-wide circular caldera or crater about 1600 feet deep that formed about 2000 years ago. Okmok has been frequently active in historical times producing ash clouds often accompanied by lava flows within the caldera. The most recent eruption occurred in 1997 and produced ash clouds and a lava flow that traveled about 5 miles across the caldera floor.

Please see http://www.avo.alaska.edu/activity/Okmok.php for more information.

Contacts: Steve McNutt, Coordinating Scientist, UAF
steve@giseis.alaska.edu (907) 474-7131

John Power, Acting Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Next Notice: More information will be released as it is received.
A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at http://www.avo.alaska.edu

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].
Contact AVO Privacy Accessibility Information Quality FOIA
URL: www.avo.alaska.edu/activity/avoreport.php
Page modified: June 17, 2015 15:03
Contact Information: AVO Web Team

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