Semisopochnoi volcano news & activity updates:
Semisopochnoi volcano (Alaska) activity update: minor tremor detected; alert level remains at yellow
Wednesday Mar 11, 2020 08:30 AM | BY: MARTIN
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.
A clear satellite image showed steam emissions from the North Cerebus crater but no evidence for eruptive deposits on the flanks.
Volcanic Alert Level remains at Level 2.
Source: Alaska Volcano Observatory volcano activity update 11 March 2020
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]
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]
Sunday, Feb 16, 2020
The Alaskan Volcano Observatory (AVO) raised the Aviation Colour Code and Alert Level for Semisopochnoi to ORANGE/WATCH due to a significant increase in seismic activity as well as small explosions and tremor bursts, lasting from three to twelve minutes every few hours. No ash plumes have been observed. [more]
Friday, Dec 27, 2019
The Alaska Volcano Observatory (AVO) reported that ash plumes reached 5,000 ft (1,500 m) altitude and drifted about 15 km SE on 14 and 17 December. ... [more]
Saturday, Dec 07, 2019
An eruption is probably occurring at the volcano. The Alaska Volcano Observatory (AVO) detected seismic signals of strong volcanic tremor, probably corresponding to the arrival of magma in the summit vent, but the nature of the eruption itself is unclear: ... [more]