Chirinkotan volcano–island is located in the rear zone of the Northern Kuril Islands. The eruptive activity of the volcano is represented by explosive (Vulcanian type) and explosive-effusive eruptions of moderate intensity; the composition of the rocks is andesite. There is information about eight historical volcanic eruptions. The paper describes the course of the eruption in August 2021 based on the study of various satellite data in the information system “Remote monitoring of Kamchatka and Kuril Islands volcanic activity” (VolSatView, http://kamchatka.volcanoes.smislab.ru). Single explosions on Chirinkotan volcano were noted on August 8–10, 15, 17, 18, 22 and 23; and three explosive events took place on August 14. Ash clouds moved mainly west, southwest, east and southeast of the volcano. The total area of ash falls during the eruption exceeded 55 thousand km2. Chirinkotan volcano ash repeatedly fell on the Islands of Raikoke, Matua, Rasshua, Ekarma, Shiashkotan, Harimkotan and Onekotan. For this eruption, the Volcanic Explosivity Index is rated 2. The activity of the volcano in August was hazardous to local aviation

Strong explosive volcanic eruptions are extremely dangerous to the modern jet aircraft as they can produce several cubic kilometers of volcanic ash and aerosols that can be sent to the atmosphere and the stratosphere in several hours to several days during the eruption. In 2016, five from thirty active volcanoes erupted in Kamchatka (Sheveluch, Klyuchevskoy, Bezymianny, Karymsky, and Zhupanovsky) and three from six active volcanoes in the Northern Kuriles (Alaid, Ebeko, and Chikurachki). Effusive volcanic activity was noted at Sheveluch, Klyuchevskoy, Bezymianny and Alaid. All the volcanoes produced explosive activity. Strong explosive events occurred at Sheveluch mainly from September till December. Moderate ash emission had accompanied of Klyuchevskoy’s eruption through March till November. Explosive activity at Karymsky, Zhupanovsky, Alaid, and Chikurachki volcanoes was observed mainly in the first half of the year. The total area covered by ash in 2016 was estimated 600,000 km2, from which 460,000 km2 were related to the eruptions of Kamchatka volcanoes and 140,000 km2 were attributed to the eruption of the North Kuriles volcanoes. The activity at Sheveluch, Klyuchevskoy, and Zhupanovsky was dangerous to international and local airlines as explosions produced ash up to 10-12 km above sea level. The activity at Bezymianny, Karymsky, Alaid, Ebeko, and Chikurachki posed a threat to local aircrafts when explosions sent ash up to 5 km above sea level.

В статье описано извержение вулкана Чиринкотан с выносом пепла до 4.5 км н.у.м., продолжавшееся с 8 по 23 августа 2021 г. Основные направления перемещения пепловых облаков от вулкана: запад, юго-запад, восток и юго-восток. Активность вулкана во время извержения была опасной для местных авиаперевозок.

В статье описана активность вулканов Камчатки и Курильских островов в 2021 г. Эксплозивные события вулкана Карымский представляли опасность для международных и местных авиаперевозок, извержения других вулканов – для местных авиаперевозок.

В работе описана активность вулканов Камчатки и Курил в 2023 г. Эксплозивные извержения вулканов Шивелуч, Ключевской и Безымянный представляли опасность для международных и местных авиаперевозок, Эбеко и Чикурачки − для местных авиаперевозок.

Seismic activity at Koryaksky volcano has started to increase since March 2008. A fumarole on the western flank of the volcano was observed in late October. On 22 December the satellite images revealed first ash plumes drifted NE for 200 km. The increased activity of the volcano was registered in March-April and August 2009. For these periods volcano has produced numerous gas plumes with various amount of ash drifted primarily E and W for 600 km.