USGS Volcano Notice - DOI-USGS-AVO-2023-10-07T12:07:41-08:00

Volcanic activity remains elevated at Shishaldin Volcano over the last day with gas emissions and frequent small earthquakes detected. No significant explosions or ash clouds have been observed.

Twelve significant explosive events have occurred at Shishaldin since July 12, 2023. These events have been preceded by increases in seismicity in the hours to days before they occur. It is unknown how long this period of ongoing activity will last. However, previous eruptions of Shishaldin Volcano have lasted weeks to months with repeated cycles of eruptive activity like those seen since July.

Local seismic and infrasound sensors, web cameras, and a geodetic network monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lighting data, and satellite images to detect eruptions.

Slow eruption of lava in the summit crater of Great Sitkin Volcano continues. Seismicity remains low with a few earthquakes detected over the past day. Clouds obscured satellite and web camera images.

The current lava flow began erupting in July 2021. No explosive events have occurred since a single event in May 2021.

Local seismic and infrasound sensors, web cameras, regional infrasound and lightning networks, and satellite data are used to monitor the volcano.

Seismic activity near Trident Volcano was low with a few local earthquakes detected over the past day. No volcanic activity was noted in clear satellite or web camera images, although resuspended ash from the 1912 eruption of Katmai was visible in webcam images yesterday afternoon.

The current period of seismic unrest began on August 24, 2022. Increases in seismic activity have been detected previously at Trident Volcano and other similar volcanoes and did not result in eruptions. We expect additional shallow seismicity and other signs of unrest, such as gas emissions, elevated surface temperatures, and ground movement, to precede any future eruption if one were to occur.   

Trident Volcano is monitored by local seismic sensors, web cameras, regional infrasound and lightning networks, and satellite data.