Small explosion signals from Pavlof volcano have been detected on the infrasound network located at Sand Point and on the local seismic network on October 19, 2019. It is unknown if the explosions produced any volcanic ash, but their small size suggests any hazard...
October 20, 2019
The Alaska Volcano Observatory (AVO) has raised the Aviation Color Code from Yellow to Orange and the Alert Level from Advisory to Watch at Shishaldin volcano on July 24, 2019. The last eruption of this volcano took place in 2015 (VEI 1). Field crews reported an...
July 24, 2019
Elevated seismicity that began under Semisopochnoi volcano, Alaska on July 17, 2019, increased overnight and was followed by a stronger tremor signal recorded at 07:39 UTC, July 18. In addition, an infrasound signal was produced on an infrasound array located 260 km...
July 18, 2019
Low-frequency seismic tremor and vigorous steam plume have been observed at Pavlof volcano, Alaska over the past 2 days, forcing the Alaska Volcano Observatory (AVO) to raise the Aviation Color Code and Alert Level to Yellow/Advisory on May 15, 2019. The...
May 16, 2019
A new lava dome was observed in the summit crater of Cleveland volcano prompting the Alaska Volcano Observatory to upgrade the Color Code/Alert Level to ORANGE/WATCH on January 17, 2019. No explosive activity has been detected or observed in seismic or infrasound...
January 18, 2019
A short-lived explosion was detected at Cleveland volcano early December 29, 2018. Ash cloud was reported rising up to 5.2 km (17 000 feet) above sea level. The Aviation Color Code remains Orange since December 12. Local seismic sensors recorded a short-lived...
December 29, 2018
Ash emissions at Veniaminof volcano increased significantly on November 21, 2018, forcing Alaska Volcano Observatory to raise the Aviation Color Code to Red and Volcano Alert Level to Warning. Veniaminof is generating a plume of ash up to 4.6 km (15 000 feet) above...
November 22, 2018
Strong seismic tremor consistent with an eruption was recorded at Semisopochnoi volcano starting at 04:47 UTC (20:47 AKDT) on October 26, 2018. Satellite data through 05:00 UTC showed a small ash cloud at about 3.6 km (12 000 feet) above sea level, the Alaska...
October 28, 2018
Veniaminof volcano continues to erupt, feeding a lava flow confined to the ice-filled summit caldera, the Alaska Volcano Observatory reports. The last known eruption of this volcano took place in 2013. While no significant ash emissions were observed, elevated...
September 12, 2018
The Alaska Volcano Observatory (AVO) has raised the Aviation Color Code to Orange and the Volcano Alert Level to Watch for Veniaminof volcano at 21:29 UTC on September 4, 2018. The last known eruption of this volcano took place in 2013. The decision to raise alerts...
September 05, 2018
The Alaska Volcano Observatory raised the Aviation Color Code and Alert Level for Great Sitkin stratovolcano to Yellow/Advisory on July 1, 2018, following another increase in the number of earthquakes under the volcano. The last known eruptive episode of this...
July 01, 2018
The Alaska Volcano Observatory has raised the Aviation Color Code for Cleveland volcano from Yellow to Orange on June 26, 2018, after detection of small lava flow inside summit crater. The last detected explosive activity at Cleveland volcano occurred May 5, 2018....
June 27, 2018
Seismicity at Alaska's Great Sitkin volcano has been at elevated levels over the past couple of days, followed by a signal that may represent a short-lived steam explosion on June 11. The last known eruption of this stratovolcano took place in 1974. Seismicity...
June 10, 2018
A small explosion took place at 05:49 UTC at Cleveland volcano, Alaska on May 5, 2018. A small ash cloud was produced rising up to 6.7 km (22 000 feet) above sea level, drifting to the southeast. A few small earthquakes were also recorded at the volcano during the...
May 05, 2018
A new explosion was detected on Alaska's Cleveland volcano on April 4, 2018, prompting authorities to raise the Alert Level to Watch and the Aviation Color Code to Orange. It was a small explosion, detected using local seismic and infrasound sensors at 11:55 UTC...
April 04, 2018
A new explosion was detected at Cleveland volcano, Alaska at 13:20 UTC on December 13, 2017. AVO raised the Aviation Color Code back to Orange. The explosion produced an eruption cloud that was observed in satellite data to an altitude of 6 km (20 000 feet) a.s.l....
December 13, 2017
Due to increased seismic and infrasound activity recorded over the past few weeks at Shishaldin volcano, the Alaska Volcano Observatory (AVO) raised the Aviation Color Code for the volcano to Yellow and the Alert Level to Advisory on Wednesday, December 6, 2017. The...
December 06, 2017
The Alaska Volcano Observatory (AVO) has raised the Aviation Color Code and Volcano Alert Level to Yellow/Advisory on November 22, 2017, after recent reports of robust steaming and a several month period of elevated earthquake activity. Historical eruptions have...
November 22, 2017
Strong northwest winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and carried it to the southeast over the past couple of days and especially on November 13....
November 14, 2017
The eruption of Cleveland volcano and slow growth of a small lava dome in the summit crater of the volcano continues, the Alaska Volcano Observatory reported at 20:00 UTC on Friday, October 6, 2017. Lava effusion in the summit crater was first noted in satellite...
October 08, 2017
A moderate, 2-minute-long eruption occurred at Cleveland volcano, Alaska beginning at 01:47 UTC on September 26, 2017. The explosion was detected by seismic and infrasound (air pressure) sensors, the Alaska Volcano Observatory said 02:15 UTC today, adding that...
September 26, 2017
A significant explosive eruption began at Bogoslof volcano at about 18:00 UTC (10:00 AKDT) on August 7, 2017. The eruption continued through about 21:00 UTC as indicated in seismic, satellite and lightning data. A pilot report at 18:45 UTC indicates that the ash...
August 07, 2017