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Semisopochnoi volcano
Stratovolcano 1221 m / 4,006 ft
United States, Aleutian Islands, 51.93°N / 179.58°E
Current status: restless (2 out of 5)
Semisopochnoi webcams / live data | Reports
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Semisopochnoi volcano eruptions:
2020, 2019, 2018, 1987
Typical eruption style:
Last earthquakes nearby
Latest satellite images

Sentinel hub | Landsat 8

Semisopochnoi volcano news & activity updates:

Semisopochnoi volcano (Alaska): the Aviation Color Code lowered to Yellow; steam plume and SO2 detected in satellite data

Thursday Apr 02, 2020 06:35 AM | BY: MARTIN

Steam plume from Semisopochnoi volcano from satellite (image: Sentinel 2)
Steam plume from Semisopochnoi volcano from satellite (image: Sentinel 2)
The Alaska Volcano Observatory (AVO) reported that seismic, infrasound, and satellite data over the past two weeks have shown no signs of eruptive activity.
A robust steam plume and a crater lake have been seen in clear satellite images, but no recent ash deposits. Although seismic activity remains above background, it does not appear to be increasing towards an eruption in the short-term.
Seismic activity persists and is characterized by occasional small earthquakes and satellite data show detectable volcanic gas (sulfur dioxide) being emitted from the volcano. Explosive activity could resume with little to no warning.
AVO lowered The Aviation Color Code to Yellow and the Volcano Alert Level to Advisory.
Source: Alaska Volcano Observatory volcano activity update 2 April 2020
Previous news
Friday, Mar 20, 2020
AVO reports that activity continues at Semisopochnoi volcano. The seismicity levels remain elevated, but no significant activity was observed over the past 24 hours. No activity was observed in cloudy satellite imagery. [more]
Monday, Mar 16, 2020
The Alaska Volcano Observatory (AVO) reported that the seismicity has been increasing the last few days at the volcano. The seismic station records continuous tremor associated with frequent minor explosion signals. ... [more]
Wednesday, Mar 11, 2020
The Alaska Volcano Observatory (AVO) reported that the seismic station records intermittent tremor bursts over the past 24 hours but were not accompanied by any infrasound detections. ... [more]
Wednesday, Feb 26, 2020
The alert level of the volcano was lowered to yellow, as no recent eruptive activity was detected on high-resolution satellite data from yesterday afternoon, the Alaska Volcano Observatory (AVO) reported (AVO): ... [more]
Seismic signal from Semisopochnoi volcano as recorded on Adak Island (image: AVO)
Thursday, Feb 20, 2020
The Alaska Volcano Observatory (AVO) reported that the seismic unrest continues at the volcano with intermittent, low-level tremor. Tremor bursts lasting from three to twelve minutes every few hours. ... [more]

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