Magma rising at Great Sitkin volcano, Alaska

Magma rising at Great Sitkin volcano, Alaska

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…

Semisopochnoi Aviation Color Code raised to Orange, Alaska

Semisopochnoi Aviation Color Code raised to Orange, Alaska

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…

Strong M6.1 earthquake hits Alaska, U.S.

Strong M6.1 earthquake hits Alaska, U.S.

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…

First significant explosion at Great Sitkin since 1974, Alaska

First significant explosion at Great Sitkin since 1974, Alaska

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…

Elevated temperatures and gas emissions at Great Sitkin volcano, Alaska

Elevated temperatures and gas emissions at Great Sitkin volcano, Alaska

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…

Increase in eruptive activity at Semisopochnoi volcano, Alaska

Increase in eruptive activity at Semisopochnoi volcano, Alaska

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…