Semisopochnoi volcano news & activity updates:
Semisopochnoi volcano (Alaska): significant increase in activity
Monday Mar 16, 2020 08:00 AM | BY: MARTIN
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.
The Aviation Color Code raised to Orange and the Alert Level to Watch.
No significant ash emissions have been detected, clouds cover much of the island to around 10,000 ft (3,048 m) altitude.
Source: Alaska Volcano Observatory volcano activity update 16 March 2020
Semisopochnoi volcano (Alaska) activity update: minor tremor detected; alert level remains at yellow
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]
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]