Lava flow field at Great Sitkin grows to more than 1.3 square km, Alaska

Lava flow field at Great Sitkin grows to more than 1.3 square km, Alaska

Seismicity at Great Sitkin volcano continues at low but above background levels and satellite data shows elevated surface temperatures. In addition, new SAR images from DLR show the lava flow field has grown to more than 1.3 km2 (0.5 mi2). The SE edge seems to have…

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…

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…

Increased earthquake activity at Great Sitkin volcano, alerts raised, Alaska

Increased earthquake activity at Great Sitkin volcano, alerts raised, Alaska

Earthquake activity at Great Sitkin volcano has increased over the past month and is now above background levels, forcing the Alaska Volcano Observatory (AVO) to raise the Aviation Color Code to Yellow and the Alert Level to Advisory at 20:58 UTC on February 26,…

Steam explosion at Great Sitkin volcano, alerts raised, Alaska

Steam explosion at Great Sitkin volcano, alerts raised, Alaska

A small steam explosion at 05:40 UTC on June 2, 2019 (21:40 AKDT June 1) was detected at Great Sitkin volcano in local seismic data, the Alaska Volcano Observatory reports. No corresponding signal was seen in regional infrasound data or cloudy satellite…

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

Robust steaming, elevated seismicity at Great Sitkin volcano, Alaska

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…