Klyuchevskaya Volcano (also spelled Kliuchevskoi), on the Kamchatka Peninsula in Russia’s far east, continues its frequent but relatively mild volcanic activity. This false-color satellite image shows not only a volcanic plume, but also active lava flows descending the volcano’s western flanks. The flows are hot enough to glow in near-infrared light, so they appear red in the image, which displays near-infrared, red, and green wavelengths as red, green, and blue respectively. (Note that in the enlarged image, vegetation also appears red because it reflects near-infrared light strongly and absorbs most red and green light.) The ash-rich plume is gray, as are the ash-covered slopes near the summit. Snow and clouds are white.
Volcanic ash from earlier eruptions has settled onto the snowy landscape, leaving dark gray swaths. The ash stains are confined to the south of the Karymsky’s summit, one large stain fanning out toward the southwest, and another toward the east.