The USGS reported a diffuse plume from Anatahan, possibly containing some ash, was visible on satellite imagery drifting SW on 14 February. On 17 and 19 February seismicity increased. On 18 February, both a low-level steam plume that possibly contained ash and a sulfur dioxide plume were visible on satellite imagery drifting SW. A sulfur dioxide plume was again noted on 19 February. The Volcanic Alert Level remained at Watch and the Aviation Color Code remained at Orange.
Source: Emergency Management Office of the Commonwealth of the Mariana Islands and the US Geological Survey Hawaiian Volcano Observatory – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”