Articles tagged "alaska volcanoes"

great sitkin june 11 2018 alaska

Elevated seismicity under Great Sitkin volcano, alerts raised again, Alaska

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

cleveland volcano october 2017

Alerts raised for Cleveland volcano after detection of small lava flow, Alaska

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

steaming at great sitkin november 19 2017

Elevated earthquake activity, possible steam explosion at Great Sitkin volcano, Alaska

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

mount cleveland alaska

Explosion at Cleveland volcano, alert level raised to Orange

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

cleveland volcano

New explosion detected at Cleveland volcano, alerts raised

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

cleveland volcano alaska us

Explosion at Cleveland volcano, ash to 6 km (20 000 feet) a.s.l.

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

shishaldin volcano alaska

Shishaldin volcano alert levels raised, Alaska

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

great sitkin november 19 2017

Robust steaming, elevated seismicity at Great Sitkin volcano, Alaska

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

resuspended ash from katmai volcano alaska november 13 2017

Strong winds in the vicinity of Katmai pick up loose volcanic ash, Alaska

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

small lava dome grows inside cleveland volcano

Lava effusion in the summit crater of Cleveland volcano, Alaska

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

cleveland volcano alaska

Moderate eruption detected at Cleveland volcano, Alaska

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

bogoslof volcano eruption

Significant explosive eruption at Bogoslof, Aviation Color Code Red

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