Earthquakes, tremor, and gas-and-steam plumes throughout February. A thermal anomaly in the crater was detected on satellite imagery during 2-10 April. and Zharinov, N.A., 1988, Mechanism of Klyuchevskoy flank eruptions of 1974, 1980, 1983 and 1987 as shown by seismological and geodetical data: Proceedings, Kagoshima International Conference on Volcanoes, p. 75-78. Two eruptive pulses: 15 August-20 December 2013 and 1 January-24 March 2015. Seismicity was above background levels at Kliuchevskoi during 11-17 October, with one to six magnitude 1.6-2.1 earthquakes per day at depths of ~30 km. Steam plumes rose to an altitude of 6 km (19,700 ft) a.s.l. Satellite imagery analyses showed a large and intense daily thermal anomaly from the volcano and ash plumes that drifted more than 200 km SE on 20 August. On 1 December, a series of NW-flank phreatic explosions produced an eruption column that rose to 5.2 km above the crater rim (10 km altitude). Satellite imagery analyses showed a large and intense daily thermal anomaly over the volcano. A weak thermal anomaly was visible on 16 December. KVERT reported that ash plumes from Klyuchevskoy were identified in satellite images drifting 315 km E and NW during 11-12 and 15-17 August. Klyuchevskaya Sopka at night © Kozincev Commons. Ash emissions continued later that day with plumes rising to 5 km a.s.l. No plumes were seen on 11 and 16 August. In addition, intermittent spasmodic volcanic tremor was recorded. On 3 and 4 November, "bursting" sounds from the volcano were heard in Klyuchi, about 30 km to the NE. Gas-and-steam plumes rose up to 300 m above crater and extended 10 km E. Series of ash plumes rose up to 300 m above crater and extended 10 km E. 26 on 25 Mar, 41 on 26 Mar; 16 M 2.0-2.2 earthquakes. . Frequent ash plumes were often visible on satellite imagery, with estimated altitudes of 4.5-10 km. KVERT reported that a weak thermal anomaly over Klyuchevskoy was identified in satellite images during 28-30 December and 2 January, and ash plumes drifted 150 km SE during 29-30 December. at the beginning of January. The volcano frequently was obscured by clouds. A 1-km-long lava flow was observed on the SW slope of the volcano; mudflows were also noted. KVERT reported that a weak thermal anomaly was identified in satellite images over Klyuchevskoy during 30 April-1 May, and an ash plume drifted about 52 km E on 1 May. The character of seismicity indicated that weak gas-and-ash explosions possibly occurred. On 27 July at 2200, the gas-and-ash plume was as high as 5 km above the crater, extending to the S for an unknown distance. Strombolian activity was noted and lava continued to flow down the flanks. KVERT reported that during 30 January-6 February a Strombolian and Vulcanian eruption at Klyuchevskoy continued. Ashfall was reported in Klyuchi, 30 km NNE on 11 June. | October Satellite imagery showed gas-and-ash plumes drifting 430 km N and NE during 26-29 November and a weak thermal anomaly over the crater on 26, 28, and 29 November. The summit eruption . Satellite imagery later that evening showed multi-layered cloudiness E of the Kamchatka Peninsula, but no distinct ash plume. The Aviation Color Code remained at Orange. The Kamchatkan Volcanic Eruption Response Team (KVERT) is responsible for monitoring, and is the primary source of information.