Semisopochnoi (United States) - Report for 17 February-23 February 2021

AVO reported that no significant activity at Semisopochnoi was recorded after several ash deposits were visible in satellite images during 6-7 February.
On 19 February the Aviation Color Code and the Volcano Alert Level were lowered to Yellow/Advisory, respectively.

Source: US Geological Survey Alaska Volcano Observatory (AVO)