A lava dome-like feature formed in the summit crater of Great Sitkin volcano, Alaska, suggesting magma is rising near the surface. As a result, the Alaska Volcano Observatory (AVO) has raised the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH. A…
The Alaska Volcano Observatory (AVO) has raised the Aviation Color Code for Semisopochnoi volcano to Orange and the Volcano Alert Level to Watch on July 12, 2021. The decision was made due to the onset of continuous volcanic tremors and detections of explosive…
A slight increase in seismic activity was observed at Gareloi volcano, Alaska on May 18, 2021, and beginning May 27 there has been a sustained increase in the rate and size of small volcanic earthquakes. Because the level of seismic activity is now above the…
A strong earthquake registered by the USGS as M6.1 hit Alaska at 06:59 UTC on May 31, 2021, at a depth of 58.2 km (36 miles). EMSC is reporting the same magnitude and depth. The epicenter was located 76.2 km (47.3 miles) N of Chickaloon (population 272), 128.3 km…
A short-lived explosive eruption began at Great Sitkin volcano, Alaska at 05:04 UTC on May 26, 2021, and lasted for about 1 to 2 minutes. The Aviation Color Code was raised to Red at 05:30 UTC. This was the first significant explosion at the volcano since 1974. The…
Several small explosions were detected at Semisopochnoi volcano, Alaska on May 18, 2021, and a small ash cloud was observed in a satellite image acquired at 23:21 UTC on May 17. As a result, the Alaska Volcano Observatory (AVO) has raised the Aviation Color Code to…
Above-background activity has been observed at the Great Sitkin volcano in Alaska, prompting the Alaska Volcano Observatory to raise the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory on May 13, 2021. Elevated surface temperatures have been…
Eruptive activity at Semisopochnoi has gradually increased over the last 24 hours, the Alaska Volcano Observatory (AVO) reported at 21:48 UTC on April 22, 2021. Satellite views of the volcano show a continuous plume extending 80 km (50 miles) to the south at…
The Alaska Volcano Observatory (AVO) has raised the Aviation Color Code to Red and the Alert Level to Warning for Semisopochnoi volcano on Friday, April 16, 2021, after sustained ash emissions rose up to 6 km (20 000 feet) a.s.l. Satellite data suggest ash emissions…
Low-level ash emissions from the summit of Veniaminof volcano, Alaska were observed in web camera views on April 5, 2021, the Alaska Volcano Observatory (AVO) reported at 20:49 UTC. Because of the renewed activity, AVO has raised the Aviation Color Code to ORANGE…
