Archived Volcanic Events of Interest
The following volcanic activity warranted a special update.
Times are local to the volcano and in military format.Alert levels & aviation color codes defined at http://volcanoes.usgs.gov/activity/alertsystem/index.php.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Sep 5, 2012 12:14 AKDT
No activity reported since 20 August.
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Little Sitkin
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Aug 30, 2012 04:20 AKDT
Sudden onset and continuing seismicity prompt Color Code/Volcano Alert Level YELLOW/ADVISORY.
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Spurr
Alert Level=Normal. Aviation Color Code=GREEN. Issued Jun 26, 2012 12:56 AKDT
Minor seismicity associated with a possible glacier outburst flow event
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Cleveland
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jun 19, 2012 15:06 AKDT
Small ash emission at Cleveland. Color code to orange.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued May 30, 2012 11:11 AKDT
No changes observed since May 9. Decreased color code/Alert level to YELLOW/ADVISORY
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Cleveland
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Mar 28, 2012 15:16 AKDT
New summit lava dome detected at Cleveland.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Mar 23, 2012 10:00 AKDT
No further explosions have been detected at Cleveland.
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Iliamna
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Mar 9, 2012 13:02 AKST
Seismic activity has increased above background
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Iliamna
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Mar 7, 2012 12:42 AKST
Increase in earthquake activity at Iliamna Volcano.
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Newberry
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Mar 7, 2012 08:47 PST
RECENTLY INSTALLED MONITORING NETWORK AT NEWBERRY VOLCANO, OREGON, NOW FULLY OPERATIONAL
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Kanaga
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Mar 2, 2012 11:17 AKST
No unusual activity detected in past 24 hours.
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Kanaga
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Feb 18, 2012 13:11 AKST
Elevated seismicity and a possible low-level ash cloud
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Cleveland
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jan 31, 2012 15:21 AKST
Satellite observations indicate renewed eruptive activity. As of 30 January, a new lava dome has been erupted in the summit crater. No ash emissions or explosions.
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Wrangell
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Jan 27, 2012 14:21 AKST
The Wrangell seismic network is out so we are removing it from our list of monitored volcanoes.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Dec 30, 2011 13:57 AKST
No new explosive activity has been detected at Cleveland. Continued activity uncertain.
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Cleveland
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Dec 29, 2011 07:55 AKST
An ash plume to 15,000 ft has been detected at Cleveland. Continued activity uncertain.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Nov 3, 2011 11:16 AKDT
No eruptive activity observed.
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Pagan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Oct 7, 2011 07:20 ChST
YELLOW/ADVISORY. Persistent steam/gas plume.
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Cleveland
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Sep 6, 2011 16:08 AKDT
Thermal anomalies and dome growth have resumed.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Aug 30, 2011 13:02 AKDT
Mostly cloudy. No activity reported.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Aug 3, 2011 16:19 HST
New lava flow, west flank of Pu`u `O`o Cone
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Cleveland
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Aug 2, 2011 15:43 AKDT
small lava dome has been observed in the summit crater.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Jul 20, 2011 14:48 AKDT
AVO is raising the volcano alert level/aviation color code to ADVISORY/YELLOW based on the detection of Thermal anomalies in satellite data.
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Long Valley Volcanic Center
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Apr 29, 2011 16:08 PDT
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Pagan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Apr 23, 2011 12:31 ChST
Color code has been raised to YELLOW/ADVISORY
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Cleveland
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Mar 31, 2011 12:07 AKDT
Based on a lack of confirmed eruptive activity over the past several months, AVO is downgrading the alert level and aviation color code to UNASSIGNED.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Mar 9, 2011 17:45 HST
Fissure on Kilauea's east rift zone continues to erupt; lava lake very deep in Kilauea's summit vent; summit/ERZ tremor and sulfur dioxide emissions elevated.
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Kilauea
Alert Level=WARNING. Aviation Color Code=ORANGE. Issued Mar 7, 2011 18:13 HST
Fissure on Kilauea's east rift zone continues to erupt; lava lake very deep in Kilauea's summit vent; summit/ERZ tremor and sulfur dioxide emissions elevated.
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Kilauea
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 5, 2011 17:39 HST
Pu`u `O`o crater floor collapsed; middle ERZ earthquake swarm; lava eruption reported 4.2 km uprift of Pu`u `O`o; summit deflating and lava lake receding.
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Pagan
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Feb 23, 2011 09:17 ChST
Color code lowered to unassigned.
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Mount St. Helens
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Feb 14, 2011 17:48 PST
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Cascade Range
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Dec 10, 2010 13:18 PST
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Cascade Range
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Nov 12, 2010 10:16 PST
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Sep 12, 2010 11:26 AKDT
Minor ash emission detected in satellite imagery.
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Pagan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Sep 10, 2010 10:47 ChST
Steam and gas emissions continue. Yellow/Advisory
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Cleveland
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Sep 10, 2010 10:42 AKDT
No reports of activity.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Aug 26, 2010 15:52 AKDT
Persistent thermal anomaly observed in satellite data. Moving to Yellow.
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Cleveland
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Jun 11, 2010 10:28 ADT
No activity observed in satellite data. Moving to unassigned.
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Sarigan
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Jun 10, 2010 07:26 ChST
No further eruptive activity, minor seismicity. Unassigned aviation code/alert level.
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Sarigan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued May 31, 2010 17:46 ADT
Seismicity and eruptive activity decline for submarine eruption near Sarigan Island. Evacuation of field crews.
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Sarigan
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued May 30, 2010 02:07 ADT
Submarine eruption near Sarigan Island. Cloud to 40K'moving south.
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Sarigan
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued May 29, 2010 13:29 ADT
Submarine eruption near Sarigan Island
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Sarigan
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued May 29, 2010 09:53 ADT
Submarine activity of unknown origin.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued May 25, 2010 16:17 ADT
Persistent thermal anomalies observed over the last few days. Aviation Color Code/Volcano Alert Level raised to Yellow/advisory
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Pagan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued May 6, 2010 03:24 ChST
report of steam/gas emissions and ash fall on the island.
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Redoubt
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Apr 12, 2010 12:10 ADT
Earthquake activity at Redoubt Volcano near background. Threat of renewed activity diminished.
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Redoubt
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Apr 5, 2010 10:59 ADT
Earthquake activity at Redoubt Volcano has increased. The Aviation Color Code is raised to Yellow and the Alert Level to Advisory.
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Mauna Loa
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Mar 30, 2010 12:28 HST
Volcanic Activity continues at normal levels.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Feb 8, 2010 17:57 MST
Yellowstone earthquake swarm has slowed considerably. Earthquakes now at background levels. Daily updates on the YVO website will cease unless conditions change.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Feb 3, 2010 11:22 MST
Yellowstone earthquake swarm continues: new University of Utah Seismograph Stations Press Release on 3 February 2010.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Feb 2, 2010 22:50 MST
Yellowstone earthquake swarm continues: increased activity during afternoon and evening of 2 February 2010.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Jan 28, 2010 09:57 MST
Earthquake swarm on the northwest edge of Yellowstone Caldera continues. No threat of volcanic eruption.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Jan 25, 2010 12:27 MST
Earthquake swarm on the northwest edge of Yellowstone Caldera continues. No threat of volcanic eruption.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Jan 21, 2010 14:26 MST
Earthquake swarm on the northwest edge of Yellowstone Caldera continues. No threat of volcanic eruption.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Jan 19, 2010 15:41 MST
Earthquake swarm on the northwest edge of Yellowstone Caldera continues.
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Redoubt
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Jan 5, 2010 15:32 ADT
Earthquake activity at Redoubt Volcano remains low. The Aviation Color Code is lowered to Green and the Alert Level to Normal.
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Redoubt
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Dec 28, 2009 09:53 ADT
A series of small repetitive earthquakes under Redoubt volcano that began Dec. 27 persists. The Aviation color code raised to Yellow and alert level to Advisory.
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Lassen Volcanic Center
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Nov 18, 2009 08:05 PST
Information Statement for the November 2 through 10, 2009, Lassen Peak swarm activity
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Lassen Volcanic Center
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Nov 17, 2009 11:16 PST
Information Statement for the November 2 through 10, 2009, Lassen Peak swarm activity
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Cleveland
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Oct 19, 2009 11:47 ADT
No signs of activity since the brief eruption on October 2, 2009. Aviation Color Code/Volcano Alert Level reduced to Green/Normal
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Shishaldin
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Oct 19, 2009 11:45 ADT
Last thermal anomaly seen in satellite images in mid August. Seismicity remains low. Aviation Color Code reduced to GREEN and Volcano Alert Level reduced to NORMAL
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Oct 5, 2009 14:20 ADT
Aviation color code and volcano alert level lowered to yellow/advisory at Cleveland Volcano. No more ash events observed.
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Cleveland
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Oct 3, 2009 02:29 ADT
AVO raising aviation color code and volcano alert level to orange/watch at Cleveland Volcano.
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Redoubt
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Sep 29, 2009 10:44 ADT
Color code downgrade to GREEN at Redoubt as activity remains low. Possibility of lava dome collapse continues to diminish.
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Cleveland
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Jul 15, 2009 14:11 ADT
AVO is lowering the aviation color code and volcano alert level to unassigned at Cleveland Volcano.
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Shishaldin
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Jul 10, 2009 14:14 ADT
Volcano has persistent thermal anomaly in summit crater - no indications that an eruption is imminenet
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Redoubt
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Jul 9, 2009 13:46 ADT
Redoubt activity remains low. Lava dome remains potentially unstable. AVO going off 24/7 ops staffing.
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Redoubt
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Jun 30, 2009 16:38 ADT
Lowering alert level to Yellow/Advisory. Growth of lava dome significantly slowed, if not stopped.
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Redoubt
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Jun 30, 2009 10:20 ADT
Lowering alert level to Yellow/Advisory. Growth of lava dome significantly slowed, if not stopped.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Jun 27, 2009 16:13 ADT
Downgrading to Yellow/Advisory. Small eruption on June 25, no further activity reported.
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Cleveland
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jun 25, 2009 14:00 ADT
Small eruption, possible ash cloud <15,000 ft above sea level.
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Veniaminof
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued May 26, 2009 11:42 ADT
Seismic activity returns to near background. Aviation color code dropped to Green, Alert level to Normal.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued May 26, 2009 11:22 ADT
Seismicity remains low. Growing lava dome unstable. Significant explosion could occur with little or no warning.
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Veniaminof
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued May 7, 2009 17:06 ADT
Increased earthquake activity above background levels. Low altitude ash emission are possible but not certain.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued May 5, 2009 06:59 ADT
Activity continues to increase. An explosive event is likely, though not certain, in the coming days.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued May 2, 2009 09:48 ADT
Eruption continues. Lava dome growing slowly. Volcano obscured by clouds in satellite and web camera images.
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Cleveland
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued May 1, 2009 08:31 ADT
No activity reported since late January.
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Pagan
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Apr 28, 2009 14:39 ChST
Steaming at Pagan volcano has diminished and therefore the aviation color code and alert level is being lowered to unassigned.
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Pagan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Apr 16, 2009 04:38 ChST
ALERT LEVEL CHANGE TO ADVISORY/YELLOW. Intermittent puffs of steam and possibly ash reported moving west to west northwest.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Apr 11, 2009 12:53 ADT
Eruption continues. Lava dome growing. Steam plume possibly with small amounts of ash.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Apr 6, 2009 14:55 ADT
Eruption continues. Lava dome growing in summit crater. Steam plume probably to 15,000 feet. Possibility of sudden explosions, ash clouds, ash fall, and mudflows.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Apr 4, 2009 06:51 ADT
Another explosive event underway. Ash cloud to 50,000 feet and drifting southeast. Lahars in Drift River Valley.
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Redoubt
Alert Level=WATCH. Aviation Color Code=RED. Issued Apr 4, 2009 06:35 ADT
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Apr 3, 2009 11:44 ADT
Eruption continues. Steam, gas, and minor ash emission is continuous, typically below 15,000 ft but as high as 25,000 ft at times. Lava dome growth continues.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 30, 2009 10:12 ADT
Explosive activity at Mt. Redoubt continues with eruption clouds occasionally extending above 20,000 ft. above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 30, 2009 05:14 ADT
Explosive activity at Mt. Redoubt continues with eruption clouds occasionally extending above 20,000 ft. above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 29, 2009 23:35 ADT
Explosive activity at Mt. Redoubt continues with eruption clouds extending above 20,000 ft. above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 28, 2009 19:36 ADT
Explosive activity at Mt. Redoubt continues with eruption clouds extending above 45,000 ft. above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 28, 2009 15:43 ADT
Explosive activity at Mt. Redoubt continues with eruption clouds extending above 35,000 ft. above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 28, 2009 13:58 ADT
Explosive activity at Mt. Redoubt continues with eruption clouds extending as high as 25,000 ft. above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 28, 2009 01:29 ADT
Explosive activity at Mt. Redoubt continues with eruption clouds extending as high as 50,000 ft. above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 27, 2009 23:54 ADT
An eruption of Redoubt volcano occurred at 23:20 AKDT (07:20 UTC). National Weather Service reports an ash cloud height to 40,000 feet above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 27, 2009 23:29 ADT
An eruption of Redoubt volcano occurred at 23:20 AKDT (07:20 UTC). National Weather Service reports an ash cloud height to 40,000 feet above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 27, 2009 19:34 ADT
An eruption of Redoubt volcano occurred at 19:25 AKDT (03:25 UTC). National Weather Service reports an ash cloud height to 51,000 feet above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 27, 2009 17:49 ADT
An eruption of Redoubt volcano occurred at 17:35 AKDT (1:35 UTC). National Weather Service reports an ash cloud height to 40,000 feet above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 27, 2009 08:51 ADT
An eruption at Redoubt at 08:40 AKDT. Preliminary cloud heights are reported to about 50,000 ft. above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 27, 2009 00:00 ADT
An eruption at Redoubt at 23:48 AKDT. Preliminary cloud heights are reported to at least 32,000 ft. above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 26, 2009 09:42 ADT
A large eruption at Redoubt began at 09:24 AKDT. Cloud heights are reported to at least 65,000 ft. above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 26, 2009 08:56 ADT
Explosive event began roughly 08:34. Reported cloud heights to 30, 000 ft above sea level.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Mar 25, 2009 13:35 ADT
No explosions in last 36 hours and seismicity has declined. Possible lava dome growth at the summit. Explosions could resume without much warning.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 25, 2009 05:53 ADT
Small explosion at 05:12 AKDT, 1312 UTC, cloud height at 15,000 ft above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 23, 2009 20:14 ADT
A significant explosive event at Redoubt began at 0341 UTC (7:41 pm local). The top of the volcanic cloud is in excess of 50,000 ft above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 23, 2009 12:18 ADT
An eruption of Mt. Redoubt, AK, began at approximately 22:38 AKDT, March 22, 2009 (0638 UTC). Eruption cloud height estimated at 50,000 ft above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 22, 2009 23:26 ADT
An eruption of Mt. Redoubt, AK, began at approximately 22:38 AKDT, March 22, 2009 (0638 UTC). Eruption cloud height estimated at 50,000 ft above sea level.
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Redoubt
Alert Level=WARNING. Aviation Color Code=RED. Issued Mar 22, 2009 22:56 ADT
An eruption of Mt. Redoubt, AK, began at approximately 22:38 AKDT, March 22, 2009 (0638 UTC).
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Mar 21, 2009 22:09 ADT
Likelihood of eruption has increased.
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Redoubt
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Mar 21, 2009 08:50 ADT
Shallow earthquake activity under the volcano that began yesterday continues.
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Sanford
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Mar 20, 2009 11:06 ADT
Orographic cloud streaming from Sanford causes a flurry of calls from locals.
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Okmok
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Mar 20, 2009 11:01 ADT
Decreased seismic activity. No eruptive activity observed.
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Lassen Volcanic Center
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Mar 19, 2009 07:29 PDT
Information Statement for the recent March 17-19, 2009, Lassen Peak swarm activity
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Redoubt
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Mar 18, 2009 09:41 ADT
It does not appear at this time that a significant eruption is likely in the short term, but conditions may evolve rapidly.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Mar 16, 2009 14:40 ADT
Color code and alert levels to orange/watch. Minor ash emission on upper south flank of volcano.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Mar 15, 2009 14:50 ADT
Color code and alert levels to orange/watch. Minor ash emission on upper flanks of volcano.
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Redoubt
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Mar 12, 2009 10:23 ADT
Color code and alert levels yellow and advisory. Information Statement gives details about current level of unrest.
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Redoubt
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Mar 10, 2009 09:56 ADT
Color code and alert levels lowered to yellow and advisory at Mt. Reodubt. Likelihood of an eruption within days is diminished.
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Okmok
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Mar 2, 2009 20:52 ADT
Increased seismic activity. No eruptive activity observed.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Feb 13, 2009 10:12 ADT
Seismic activity remains elevated. Likelihood of an eruption remains.
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Shishaldin
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Feb 11, 2009 16:11 ADT
volcano at background levels
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jan 30, 2009 07:16 ADT
Seismic activity has increased. Likelihood of an eruption, perhaps within days, increased.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jan 29, 2009 13:53 ADT
Seismic activity has increased. Likelihood of an eruption, perhaps within days, increased.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jan 28, 2009 16:19 ADT
Seismic activity has increased. Likelihood of an eruption, perhaps within days increased.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jan 25, 2009 16:28 ADT
Seismic activity has increased. Likelihood of an eruption, perhaps within days increased.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jan 25, 2009 06:57 ADT
Seismic activity has increased. Likelihood of an eruption, perhaps within days increased.
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Redoubt
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jan 25, 2009 02:09 ADT
Seismic activity has increased. Likelihood of an eruption, perhaps within days increased.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Jan 9, 2009 07:44 MST
Small Earthquake Swarm on 9 January 2009 near northeast corner of Yellowstone Caldera
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Shishaldin
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Jan 6, 2009 15:28 ADT
Increased potential for eruption.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Jan 6, 2009 00:39 MST
Yellowstone Lake Earthquake Swarm Summary through 5 January 2009, seismic activity has markedly decreased.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Jan 2, 2009 12:51 ADT
Short-lived ash emission to about 20,000 feet. Appears to have rapidly dispersed over the ocean E-SE of the volcano.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Jan 2, 2009 07:30 MST
Yellowstone Lake Earthquake Swarm Update: 2 January 2008
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Dec 29, 2008 07:07 MST
The swarm of earthquakes that started on December 26 beneath Yellowstone Lake in Yellowstone National Park continues.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Dec 27, 2008 08:29 MST
A swarm of small earthquakes of magnitude 3.5 and smaller is occurring beneath Yellowstone Lake in Yellowstone National Park.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Dec 24, 2008 13:22 ADT
The aviation color code is raised to Yellow and the alert level to Advisory for Cleveland volcano based on a persistent thermal anomaly seen in satelite data.
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Okmok
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Nov 19, 2008 09:54 ADT
No activity observed.
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Redoubt
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Nov 5, 2008 14:52 ADT
Alert level increase to Advisory/Yellow. AVO has detected potentially significant changes in gas and heat output from Redoubt Volcano.
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Kasatochi
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Oct 30, 2008 15:41 ADT
Alert level decrease to Unassigned/Unassigned. No new activity observed.
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Cleveland
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Oct 9, 2008 12:59 ADT
Alert level decrease to Unassigned/Unassigned. The level of volcanic activity has declined significantly over the past month. Because Cleveland is not monitored with real-time seismic instrumentation, the absence of unrest cannot be confirmed.
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Redoubt
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Oct 3, 2008 15:42 ADT
Weak but anomalous volcanic seismicity has been detected at Redoubt.
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Redoubt
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Oct 3, 2008 10:37 ADT
A recent overflight of Redoubt Volcano showed increased fumarolic activity and small glacial disruptions.
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Anatahan
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Oct 1, 2008 08:31 MPT
Alert level decrease to Normal/Green. Seismicity remains low and no recent reports of significant plumes.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Sep 5, 2008 15:26 HST
Sloshing lava lake viewed within Halema`uma`u vent from helicopter
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Kasatochi
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Sep 4, 2008 14:26 ADT
Seismic activity continues.
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Okmok
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Aug 27, 2008 13:53 ADT
Seismicity at Okmok has been declining for 8 days. AVO is lowering the aviation color code from Orange to Yellow and the Alert Level from Watch to Advisory.
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Cleveland
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Aug 25, 2008 14:51 ADT
No recent thermal anomalies observed.
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Kasatochi
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Aug 12, 2008 13:29 ADT
Volcanic ash from Kasatochi is expected to move over southeast Alaska at high altitudes. No ashfall on the ground is expected.
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Anatahan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Aug 12, 2008 09:43 MPT
Aviation color code lowered from Orange to Yellow. Low-level steaming and occasional SO2 emissions likely.
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Cleveland
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Aug 11, 2008 13:52 ADT
Cleveland continues to erupt lava. No indication of ash plumes.
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Kasatochi
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Aug 9, 2008 22:04 ADT
Seismic activity at Kasatochi can no longer be detected on nearby stations. No ash observed in satellite data and observations by passing boats indicate activity has declined.
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Kasatochi
Alert Level=WARNING. Aviation Color Code=RED. Issued Aug 9, 2008 16:23 ADT
Seismic activity at Kasatochi can no longer be detected on nearby stations. AVO must rely on satellite and visual reports to monitor activity
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Kasatochi
Alert Level=WARNING. Aviation Color Code=RED. Issued Aug 7, 2008 15:26 ADT
Eruption in progress. Large earthquakes and volcanic tremor are occurring in the vicinity of Kasatochi Volcano. Kasatochi is an unmonitored volcano with no seismic network.
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Kasatochi
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Aug 7, 2008 13:57 ADT
Large earthquakes and volcanic tremor are occurring in the vicinity of Kasatochi Volcano. Potential for eruptive activity has increased. Kasatochi is an unmonitored volcano with no seismic network.
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Kasatochi
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Aug 6, 2008 19:17 ADT
Rapid increase in earthquake activity in the vicinity of Kasatochi Volcano. Potential for eruptive activity. Kasatochi is an unmonitored volcano with no seismic network.
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Cleveland
Alert Level=WATCH. Aviation Color Code=YELLOW. Issued Aug 6, 2008 11:16 ADT
Volcanic unrest at Cleveland Volcano appears to have declined. No significant ash emissions have occurred since July 29.
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Okmok
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Aug 2, 2008 15:35 ADT
Strong volcanic tremor at Okmok has declined although intermittent bursts of tremor are occurring intermittently.
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Okmok
Alert Level=WARNING. Aviation Color Code=RED. Issued Aug 2, 2008 04:42 ADT
Strong volcanic tremor resumed at Okmok beginning at about 04:05 AKDT (12:05 UTC).
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Okmok
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jul 30, 2008 10:34 ADT
Satellite images and pilot reports indicate the ash plume at Okmok is at altitudes between 15,000 and 20,000 ft. Color CODE is now ORANGE. Alert Code is now WATCH
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Okmok
Alert Level=WARNING. Aviation Color Code=RED. Issued Jul 28, 2008 16:51 ADT
Satellite images indicate ash may have reached 35,000 ft in a plume heading E to SE from the volcano.
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Anatahan
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jul 28, 2008 10:17 MPT
Seismic tremor continues to slowly increase; a 5000 ft high plume extending 40 nautical miles North was seen in satellite data today.
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Anatahan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Jul 26, 2008 11:48 MPT
Seismic activity has been slowly increasing for the last week; a weak low-level plume was visible in satellite data.
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Okmok
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jul 26, 2008 11:01 ADT
The intensity and duration of tremor from the eruption at Okmok has decreased over the last five hours.
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Okmok
Alert Level=WARNING. Aviation Color Code=RED. Issued Jul 25, 2008 13:47 ADT
The intensity of eruption at Okmok has increased over the last hour.
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Mount St. Helens
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Jul 11, 2008 11:08 PDT
Volcanic Alert Level and Aviation Color Code lowered to Normal and Green. Earthquakes, volcanic gas emissions, and ground deformation are all at pre-eruptive background levels.
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Long Valley Volcanic Center
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Jun 28, 2008 08:16 PDT
M=4.3 earthquake at 7:44 AM located just south of Long Valley caldera produced perceptible shaking throughout the Mammoth Lakes area.
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Anatahan
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued May 20, 2008 09:57 MPT
The color code and alert level is being lowered to Green and Normal. Seismic activity has been low for over a month and no ash or gas plumes have been reported.
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Anatahan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Mar 31, 2008 05:45 MPT
Eruptive activity likely ceased. Aviation Color Code and Volcano Alert Level lowered to Yellow and Advisory.
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Yellowstone
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Mar 25, 2008 11:16 MDT
A magnitude 4.10 earthquake occurred at 05:59 AM (MDT) in Yellowstone National Park.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Mar 24, 2008 02:43 HST
Eruption of small incandescent particles in Halema`uma`u Crater; summit sulfur dioxide emissions and seismic tremor levels remain elevated; lava continues to breakout at the surface and flow into the
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Mar 19, 2008 02:28 HST
Explosive eruption in Halema`uma`u Crater, Kilauea Volcano, is first since 1924
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Anatahan
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Feb 5, 2008 09:01 MPT
Satellite images from February 3, 2008 show a diffuse ash plume extending west from the volcano for approximately 60 miles (100 km).
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Anatahan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Jan 31, 2008 07:20 MPT
Over past week, increasing levels of volcanic tremor. Satellite data show lake within the east crater has disappeared.
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Anatahan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Nov 29, 2007 09:54 MPT
Volcanic Alert Level and Aviation Color Code increased to Advisory and Yellow. Amplitude of volcanic tremor has increased. Episodes of more vigorous tremor and small explosions have occurred.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Nov 21, 2007 06:12 HST
Lava bypasses July 21 channel and erupts from channel flank.
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Anatahan
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Oct 12, 2007 09:21 MPT
Volcano Alert Level and Aviation Color Code lowered to Normal and Green. Seismic activity at Anatahan has been at or near background since October 1.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Sep 30, 2007 08:51 HST
The 7/21 eruption continued to supply an open lava channel that fed three `a`a flows.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Sep 29, 2007 08:34 HST
SO2 concentrations within Hawai`i Volcanoes National Park are over 2,000 ppb and have been deemed UNHEALTHY (greater than 500 ppb).
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Anatahan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Sep 15, 2007 03:13 MPT
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Aug 14, 2007 09:22 HST
Difficult to assess activity at the 7/21 fissure area or effect of magnitude-5.4 earthquake on eruption due to Hurricane Flossie.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Aug 13, 2007 09:48 HST
A magnitude-5.4 earthquake located beneath the south flank of Kilauea Volcano at 7:38 p.m. H.s.t. and was felt island-wide.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jul 22, 2007 09:41 HST
The lower 7/21 fissure is still active; flows are ponding between Pu`u Halulu, Pu`u Kahauale`a, and Kupaianaha. 3-4 active ponds are submerging the fissures.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jul 22, 2007 03:32 HST
7/21 eruption initial outbreak came from two sets of fissures. Several small ponds are still forming. Floor of Pu`u `O`o crater dropped a few tens of meters and adjacent lava ponds have drained.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jul 21, 2007 08:14 HST
The eruption from fissures east of Pu`u `O`o continues; cracks extend from the east rim of the crater and lava emerges first about 150 m east.
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Kilauea
Alert Level=WATCH. Aviation Color Code=ORANGE. Issued Jul 21, 2007 03:20 HST
For the first time since February 7, 1992, lava is erupting east of Pu`u `O`o crater from a set of f(...)
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Agrigan
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Jul 18, 2007 11:20 MPT
An earthquake (~M 3.3) was reported felt on Agrigan island. No sulfur smell or any other signs of volcanic activity were reported.
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Kilauea
Alert Level=WATCH . Aviation Color Code=ORANGE. Issued Jul 2, 2007 20:09 HST
Lava returns to Pu`u `O`o crater. The crater is still filled with fume making the lava difficult to see.
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Kilauea
Alert Level=WATCH . Aviation Color Code=ORANGE. Issued Jun 21, 2007 21:13 HST
Pu`u `O`o activity is paused. There is no active lava visible anywhere on the flow field.
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Kilauea
Alert Level=WATCH . Aviation Color Code=ORANGE. Issued Jun 21, 2007 00:51 HST
Activity at Kilauea Volcano has not changed significantly at the summit or east rift zone since 6 a.m. The summit shows only slight inflation and tremor levels continue at a steady rate.
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Kilauea
Alert Level=WATCH . Aviation Color Code=ORANGE. Issued Jun 20, 2007 20:27 HST
Activity at Kilauea Volcano has not changed significantly at the summit or east rift zone since 6 a.m. The summit shows only slight inflation and tremor levels continue to decrease.
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Kilauea
Alert Level=WATCH . Aviation Color Code=ORANGE. Issued Jun 20, 2007 15:21 HST
Activity at Kilauea Volcano has not changed significantly at the summit or east rift zone since 6 a.m. The summit shows only slight inflation; the tremor levels continue to decrease.
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Long Valley Volcanic Center
Alert Level=NORMAL . Aviation Color Code=GREEN . Issued Jun 20, 2007 15:05 PDT
Earthquake sequence south of Long Valley caldera. A magnitude M=3.6 earthquake was followed by a M=4.6 earthquake and multiple aftershocks through June 20. There is no evidence for increased earthquake activity or ground deformation within the caldera.
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Kilauea
Alert Level=WATCH . Aviation Color Code=ORANGE. Issued Jun 20, 2007 09:45 HST
HVO scientists measured concentrations greater than 10 ppm in a broad area adjacent to Halemaï¿œumaï¿œu crater.
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Kilauea
Alert Level=WATCH . Aviation Color Code=ORANGE. Issued Jun 17, 2007 14:55 HST
An earthquake swarm started at 2:15 a.m., June 17, 2007 and by 2 p.m., about 230 earthquakes were located in the upper east rift zone. Fresh cracks have opened about 2 cm in the Chain of Craters road near the Mauna Ulu turnoff.
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Kilauea
Alert Level=WATCH . Aviation Color Code=ORANGE. Issued Jun 17, 2007 07:50 HST
A swarm of earthquakes and rapid deflation started at 2:15 a.m. in the upper east rift zone near Mauna Ulu. The event is most likely an intrusion of magma.
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Kilauea
Alert Level=WATCH . Aviation Color Code=ORANGE. Issued Jun 17, 2007 07:50 HST
Ongoing swarm beneath the upper east rift zone of Kilauea early this morning. About 70 shallow earthquakes have occurred in 2 hours.
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Kilauea
Alert Level=WATCH . Aviation Color Code=ORANGE. Issued May 24, 2007 16:27 HST
A magnitude-4.7 earthquake was recorded at 9:13 a.. H.s.t. It was located beneath the upper east rift zone of Kilauea volcano followed by several aftershocks.
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Anatahan
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Apr 23, 2007 17:46 MPT
Seismometers on Anatahan recorded low levels of tremor until April 20 UTC when the levels increased and remained slightly elevated. This is not a significant change.
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Anatahan
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Mar 24, 2007 10:47 MPT
Seismometers on Anatahan recording low levels of tremor. OMI satellite data showed occasionally high(...)
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Anatahan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Mar 19, 2007 18:10 MPT
Seismometers on Anatahan recording low levels of tremor. OMI satellite data showed occasionally high amounts of Sulfur dioxide over Anatahan. No confirmed ash eruptions have occurred since September 3, 2005.
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Anatahan
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Feb 18, 2007 11:35 MPT
Residents reported smells and hazy air Saturday afternoon on Saipan. Anatahan has been continuously emitting a weak gas and steam plume for many months that is occasionally blown towards Saipan.
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Pagan
Alert Level=UNASSIGNED. Aviation Color Code=UNASSIGNED. Issued Dec 20, 2006 19:03 MPT
ALERT LEVEL CHANGE TO UNASSIGNED/UNASSIGNED. No ash eruptions reported since December 8.
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Anatahan
Alert Level=NORMAL. Aviation Color Code=GREEN. Issued Dec 6, 2006 15:19 MPT
ALERT LEVEL CHANGE TO NORMAL/GREEN. Anatahan continues to emit a weak gas and steam plume.
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Pagan
Alert Level=ADVISORY. Aviation Color Code=YELLOW. Issued Dec 5, 2006 17:15 HST
At 08:00 December 4 UTC, HVO and EMO personnel were advised by Pagan residents that ash fell on their camp.
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