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 июне 2019 г. на небольшом острове-вулкане Райкоке, расположенном в центральной части Курильской дуги, произошло короткое, но сильное эксплозивное извержение, кульминационная стадия которого продолжалась 3.5 ч, высота пеплового облака достигла 13 км. Анализ серии спутниковых изображений в сочетании с наземными исследованиями позволили охарактеризовать пирокластические отложения извержения и определить масштаб их воздействия на экосистемы острова. Установлено, что извержение имело фреатомагматический субплинианский–плинианский характер.

Karymsky is one of the most active volcanoes of Kamchatka. In the past two years, single powerful explosions with ash removal up to 8–10 km a. s. l. were noted. The explosive event of April 19, with the rise of an ash cloud up to 10 km a. s. l., occurred against the background of a continuous emission of ash from the volcano. Due to the high cyclonic activity near Kamchatka, the ash cloud on April 19–21 stretched into a 1000 km long band from southeast to northeast. The northern part of the eruptive cloud was drawn into the Arctic zone by another cyclone. The area of the ash cloud was over 246 thousand km 2. In addition to the eruptive one, a large cloud of sulfur dioxide was well manifested at the beginning of the eruption. A cloud slightly saturated with sulfur dioxide was observed over the Arctic zone on April 21–22. A detailed description of the explosive event of the volcano and the spread of the ash cloud was performed based on the study of various satellite data in the information system “Remote monitoring of the activity of the volcanoes of the Kamchatka and the Kuriles” (VolSatView, http://kamchatka.volcanoes.smislab.ru).

Mutnovsky volcano is one of the most active volcanoes of the Southern Kamchatka. It is a complex edifice formed by four merged stratovolcanos with summit calderas. The Active funnel, 440×100 m in size, is cut into the western rim of the Yugo-Zapadny volcano’s crater. Mutnovsky’s modern activity is characterized mainly by fumarole activity, with gas-steam jets rising up to 300 m (rarely up to 1000 m) above the rim of the Active funnel. In the 21st century, four explosive events of the volcano occurred: March 17, 2000; April 16, 2007; July 3, 2013; and July 1, 2026. It has been shown that before the explosions in 2000, 2007, and 2026, increased heat flow was observed in the area of the volcano, respectively, in 1998–2000, 2005–2007, and 2024–2026. This was manifested by increased movement of the ice masses covering the volcano’s intracaldera slopes. The increase in heat flow in the Mutnovsky area prior to the 2026 explosive event was clearly evident in the volcano’s increased thermal activity, as determined by satellite data. It is expected that the next explosive event in the Active funnel could occur in the spring or summer of 2032 or 2033.

The first results of tephrachronological researches of the Sarychev Peak volcano, the Matua Island, (Central Kuriles) are represented including the reconstruction of its eruptive history in the Holocene. Based on the study of the distribution of petrogenous oxides and microelements in the tephra sampled layer-by-layer from the reference section of soil-pyroclastic cover of Matua Island, a general trend of the geochemical evolution of the volcano products during the Holocene epoch is traced, their typification was made. The horizons of the transition ashes were identified.