Animated gif (download "full res" image to view) of Himawari-8 satellite views of Semisopochnoi's eruptive plume, midnight April 16, 2021 through 16:00 April 16, 2021, UTC time. In the animation, you can see the ash as a purplish gray-colored plume first being carried southeast from Semisopochnoi (island in near-center of the field of view), and, as the wind direction changes and regional clouds move in, the ash plume arcs and travels northwest from Semisopochnoi. This false-color scale combines different wavelengths of infrared light to highlight volcanic clouds relative to meteorological clouds (the green and red clouds) and the background ocean (blue) in day or night viewing conditions. The lower Semisopochnoi plume is periodically obscured by higher meteorological clouds passing above the plume.
Animation available at : https://rammb-slider.cira.colostate.edu/
Image courtesy of AVO/USGS, CIRA and RAMMB.
Please cite the photographer and the Alaska Volcano Observatory / U.S. Geological Survey, CIRA, and RAMMB when using this image.
To obtain a high-resolution image, open the full size
page. Then, right click on the image and click
"Save Image As..." or "Save Picture as..."