Semisopochnoi volcano news & activity updates:
Wed, 7 Aug 2019, 12:05
AVO reported that during 31 July-6 August seismicity at the volcano remained elevated and was characterized by periods of weak, continuous tremor and discrete low-frequency earthquakes. Satellite images were mostly cloudy, though a possible steam plume was visible during 5-6 August. ...meer
Sat, 6 Jul 2019, 08:26
Yesterday, the Alaska Volcano Observatory raised the alert level of the volcano due to an increase in seismicity above background levels. ...meer
Semisopochnoi volcano (United States, Aleutian Islands) activity update: Explosive activity declines, continuing high seismicity
Thu, 1 Nov 2018, 23:55
AVO reports that there have been no explosions in the last day, and only two the day before. The volcano remains highly restless and explosions could resume.
Semisopochnoi volcano (United States, Aleutian Islands) activity update: Continuing eruptive activity
Tue, 30 Oct 2018, 11:32
Triple-coned Mount Cerberus; the location of the 2018 eruption, in the foreground, with long-quiet Anvil Peak in the background. Credit: Roger Clifford, via AVO.
Fri, 26 Oct 2018, 18:45
Fri, 26 Oct 2018, 06:43
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Fri, 26 Oct 2018, 05:45
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Semisopochnoi volcano (United States, Aleutian Islands) activity update: Eruption stopped, continuing seismicity
Fri, 12 Oct 2018, 21:24
AVO has lowered the Aviation Color Code and Alert Level to YELLOW/ADVISORY due to satellite observations and a lack of tremor lately indicating that eruptive activity has stopped. Elevated seismicity continues.
Semisopochnoi volcano (United States, Aleutian Islands) activity update: New eruption, minor ash emissions, new tephra cone
Wed, 3 Oct 2018, 02:56
On September 16, AVO raised the volcano to Aviation Color Code YELLOW and Volcanic Alert Level ADVISORY due to increased seismicity. The following day, activity increased further, with bursts of tremor; AVO raised the Aviation Color Code to ORANGE and Volcanic Alert Level to WATCH. Subsequent satellite imagery showed ash deposits and a new tephra cone on the northern cone of Mount Cerberus, one of the cones of the volcanic system. No significant emissions have been detected.
Tue, 2 Jun 2015, 11:05
A decline in seismicity over the last few months and no sign of activity in daily satellite images prompts AVO to downgrade Semisopochnoi volcano from Aviation Color Code YELLOW and Volcanic Alert Level ADVISORY to UNASSIGNED. (USGS)