Klyuchevskoy volcano (Kamchatka): activity summary 13-25 March 2015
from the Smithsonian / USGS Weekly Volcanic Activity Report 18-24 March 2015:
"KVERT reported that during 13-20 March the eruption at Klyuchevskoy continued but the energy of the explosions decreased significantly.
Explosions generated ash plumes that rose to altitudes of 5-5.5 km (16,400-18,000 ft) a.s.l. During 16-17 March satellite images showed a weak thermal anomaly over the volcano and ash plumes that drifted 90 km E.
Ash plumes were again detected in images during 22-23 March. On 25 March the Aviation Color Code was lowered to Yellow."