Klyuchevskaya Sopka

Beginning in early January 2007, the Klyuchevskaya volcano began another eruption cycle. Students from the University of Alaska Fairbanks and scientists of the Alaska Volcano Observatory traveled to Kamchatka in the spring to monitor the eruption. On 28 June 2007, the volcano began to experience the largest explosions so far recorded in this eruption cycle. An ash plume from the eruption reached a height of 10 km (33,000 ft) before drifting eastward, disrupting air traffic from the United States to Asia and causing ashfalls on Alaska's Unimak Island.

As early as 27 February 2010, gas plumes had erupted from Klyuchevskaya Sopka (reaching elevations of 7,000 m (22,966 ft)) and during the first week of March 2010, both explosive ash eruptions and effusive lava eruptions occurred until, by 9 March, the ash cloud was reported to have reached an elevation of 6,000 m (19,685 ft). Also, significant thermal anomalies have been reported and gas-steam plumes extended roughly 50 km (31 mi) to the north-east from the volcano on 3 March.

On 15 October 2012, the volcano had a weak eruption that stopped the following day. Also a weak thermal eruption occurred on 29 November 2012, then stopped again, as all of its neighboring volcanoes Bezymianny, Karymsky, Kizimen, Shiveluch, and Tolbachik erupted more actively and continuously, taking a major magma supply load off of Klyuchevskaya Sopka.

On 25 January 2013, the volcano had a weak or lazy-type strombolian eruption that stopped the following day. During January 2013, all volcanoes in the eastern part of Kamchatka —Bezymianny, Karymsky, Kizimen, Klyuchevskaya Sopka (aka Kliuchevskoi), Shiveluch, and Tolbachik erupted except Kamen (volcano).

False color image of the October 17, 2013, eruption.

On August 15, 2013, the volcano had another weak Strombolian eruption with some slight lava flow that put on an excellent fireworks display before stopping on August 21, 2013, when Gorely Volcano woke up and started erupting again in relief of Klyuchevskaya Sopka.

On October 12, Klyuchevskaya had another three days of on-and-off eruptions with anomalies and a short ash plume, possibly indicating Strombolian and weak Vulcanian activity. An explosion from a new cinder cone low on Kliuchevskoi's southwest flank occurred on October 12. An ash plume rose to altitudes of 6–7 km (20,000–23,000 ft), and drifted eastward. The eruptions weakened and paused by October 16, 2013.[3]

On November 19, a strong explosion occurred, and observers reported that ash plumes rose to altitudes of 10–12 km (33,000–39,000 ft) and drifted southeast. The Aviation Color Code was raised to Red. Later that day, the altitudes of the ash plumes were lower and the eruptions weakened and stopped again.

On December 7, activity at Kliuchevskoi significantly increased, having continued during November 29 – December 7, prompting KVERT to raise the Alert Level to Red. Ash plumes rose to altitudes of 5.5–6 km (18,000–20,000 ft) above sea level and drifted more than 212 km (132 mi) northeast and over 1,000 km (621 mi) east. According to a news article, a warning to aircraft was issued for the area around the volcanoes. Video showed gas-and-steam activity, and satellite images detected a daily weak thermal anomaly. On December 9, the Alert Level was lowered to Green when the eruptions abruptly stopped.

On January 2, 2015, after a one-year period of inactivity, the volcano had a strombolian eruption which stopped on January 16, 2015. Minor eruptions resumed on March 10, 2015 and stopped on March 24, 2015. On August 27, 2015, the volcano had another strombolian eruption which ended 16 hours later. On October 25, 2019, the volcano had another weak strombolian eruption which ended some 30 hours later. This type of minor eruptions continued through 2016 and into 2019.

Kluchevskaya Sopka saw renewed eruption activity beginning in 2019 and continuing into 2020.

A recent volcanic eruption occurred on December 09, 2020.