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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
Semisopochnoi volcano books
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): alert level lowered

Thursday Apr 02, 2020 07:28 AM | BY: T

The Alaska Volcano Observatory (AVO) lowered the alert level of the volcano because no signs of eruptive activity had been detected during the past two weeks:
"Seismic, infrasound, and satellite data over the past two weeks have shown no signs of eruptive activity at Semisopochnoi. 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. Thus, AVO is reducing the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. Unrest continues. 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)
Previous news
Steam plume from Semisopochnoi volcano from satellite (image: Sentinel 2)
Thursday, Apr 02, 2020
The Alaska Volcano Observatory (AVO) reported that seismic, infrasound, and satellite data over the past two weeks have shown no signs of eruptive activity. ... [more]
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]

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