High-resolution satellite imagery acquired on February 6, 2021, showed a small ash deposit extending less than 3 km (1.8 miles) to the north from North Cerebus Crater on Semisopochnoi Island, Alaska, U.S. Steam emissions obscured views into the crater, the Alaska…
Six stratovolcanoes comprising the Islands of Four Mountains in Alaska's central Aleutian Islands may not be separate volcanoes, but instead a part of one enormous volcanic caldera system, according to scientists who presented the evidence at the American…
Low-level seismicity continues at Korovin Volcano with no other signs of volcanic activity detected in infrasound sensors or partly cloudy satellite views, the Alaska Volcano Observatory (AVO) reported at 19:42 UTC on November 1, 2020. The last eruption at this…
The Alaska Volcano Observatory (AVO) is recording increased earthquake activity at Makushin volcano over the past 2 weeks. In response, the observatory raised the Aviation Color Code to Yellow on June 15 and plans to continue close monitoring of seismic activity,…
Over the past several days there have been periods of seismic tremor and occasional earthquakes at Veniaminof volcano, forcing the Alaska Volcano Observatory (AVO) to raise the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory. The volcano has a…
Two earthquakes with magnitudes larger than 4.0 were registered in the vicinity of Makushin volcano, Alaska over the past 12 hours, representing a significant departure from background earthquake activity. The last eruption of this volcano took place in 2005 (VEI…
A high-resolution satellite image today shows lava and what appears to be a new cone within the Shishaldin summit crater, prompting the Alaska Volcano Observatory to raise the Aviation Color Code to ORANGE and the Alert Level to WATCH at 06:31 UTC on March 15, 2020….
Seismicity has been increasing over the last few days at Semisopochnoi volcano, Alaska and now is characterized by nearly continuous tremor and frequent small explosion signals. The situation represents a significant increase in activity and the Alaska Volcano…
Eruptive activity at Shishaldin volcano resumed on January 18, 2020, with lava flows visible on the NE flank. The Aviation Color Code remains Orange and Alert Level Watch since January 7. A weak plume, possibly containing a small quantity of ash, is visible in…
Ash cloud produced by the strong eruption at Shishaldin volcano, Aleutian Islands, Alaska at 14:10 UTC on January 7, 2020, reached 10 km (33 000 feet) above sea level before midnight UTC. Volcanic ash tops were raised from previously reported 7.6 km (25 000 feet)…
