There are 36 active volcanoes in Kamchatka and Northern Kuriles, from 3 to 8 volcano eruptions occur here every year. Daily satellite monitoring of volcanoes has been performed by the Kamchatka Volcanic Eruption Response Team (KVERT) since 1997 in cooperation with colleagues from the Alaska Volcano Observatory (USA). Since 2002, KVERT scientists have processing and analyzing primary images of satellite systems NOAA (AVHRR), TERRA and AQUA (MODIS), etc. in close–to–real time to detect ash plumes and thermal anomalies on active volcanoes. The multiparameter analysis of the available published information about volcanoes, as well as visual and satellite data obtained by KVERT scientists during 24 years of daily monitoring of volcanic activity, made it possible to identify the main features of the activity at each of the active volcanoes and assess their degree of danger for air transportation and population of the peninsula. With the creation in 2011 of the information system “Remote monitoring activity of volcanoes of Kamchatka and the Kuriles (VolSatView)”, volcanologists opportunity have the opportunities that have no analogues in the world to conduct satellite observations of active volcanoes. VolSatView combines a wide range of data from various satellite systems coming from different sources and allows us to process operational and retrospective satellite information directly in the web–interface by means of specially created tools, to compare it with video information, to simulate ash plumes propagation, to classify various volcanogenic objects and etc. VolSatView enables to solve problems at different levels — from on–line monitoring of volcanoes activity to the fundamental problems in volcanology. The character of volcanic activity changes and the actuality of solving the problem of “how the volcano works” remain. To accomplish this task and for searching precursors of explosive volcanic eruptions, it is necessary to continue long–term remote observations of the volcanoes in the region; to study changes in their activity with time; to compare behavior of volcanoes supplying the eruptive products of similar and contrast compositions to the earth surface.

Chikurachki volcano is located in the northern part of the Karpinsky Ridge on Paramushir Island of the Northern Kuriles. Its eruptive activity is represented by explosive (vulcanian type) and explosive-effusive moderate eruptions; its rock composition is basaltic andesites. Information about fifteen historical eruptions of the volcano is known. The paper describes the eruption in January-February 2022 based on the study of various satellite data in the information system “Remote monitoring activity of Kamchatka and the Kuriles volcanoes” (VolSatView, http://kamchatka.volcanoes.smislab.ru). The explosive eruption continued for three days, the explosions raised ash to 5.5 km above sea level, and ash plumes moved for 260 km mainly to the west, southwest, and southeast of the volcano. The total area of ash falls during the eruption exceeded 28 thousand km2, including 640 km2 on land. Volcanic activity was dangerous for low-flying aircraft.

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