GREAT SITKIN (VNUM #311120) 52☄'35' N 176☆'39' W, Summit Elevation 5709 ft (1740 m) Current Volcano Alert Level: WATCH Current Aviation Color Code: ORANGE Semisopochnoi volcano is monitored by local seismic and infrasound sensors, satellite data, webcams, and regional infrasound and lightning networks. Additional ash-producing events could occur again with little warning.

Small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Young and ash clouds usually under 10,000 ft (3 km) above sea level have characterized the recent periods of activity. Clouds obscured webcam and satellite images. Semisopochnoi volcano was seismically quiet over the past 24 hours, and no eruptive activity was observed.

Geological Survey Monday, April 10, 2023, 11:41 AM AKDT (Monday, April 10, 2023, 19:41 UTC) SEMISOPOCHNOI (VNUM #311060) 51★5'44' N 179☃5'52' E, Summit Elevation 2625 ft (800 m) Current Volcano Alert Level: WATCH Current Aviation Color Code: ORANGE ALASKA VOLCANO OBSERVATORY DAILY UPDATE U.S.

Obs alerts