Bushenkova N.A., Koulakov I.Yu., Bergal-Kuvikas Olga, Shapiro Nikolay M., Gordeev E.I., Chebrov D.V., Abkadyrov Ilyas, Jakovlev Andrey, Stupina Tatiana, Novgorodova A., Droznina S.Ya., Huang H. Connections between arc volcanoes in Central Kamchatka and the subducting slab inferred from local earthquake seismic tomography // Journal of Volcanology and Geothermal Research. 2023. Vol. 107768. https://doi.org/10.1016/j.jvolgeores.2023.107768.
The area of Central Kamchatka limited by latitudes of 52.5 and 54 degrees includes six active volcanoes (Avacha, Koryaksky, Zhupanovsky, Mutnovsky, Gorely and Opala), as well as a number of dormant and extinct stratovolcanoes, monogenic cones and large calderas. Furthermore, it contains the Malko-Petropavlovsk fracture zone (MPZ), which marks the boundary between two distinct subduction regimes to the south and to the north. We present a new seismic tomography model for this area, which was constructed based on the joint use of data of the Kamchatkan permanent seismic stations and a temporary network installed in the region in 2019–2020. A series of synthetic tests have demonstrated fair resolution of the derived seismic velocity structures in the crust and in the mantle wedge down to ~150 km. The distributions of the P and S wave velocities, and especially the Vp/Vs ratio, clearly highlight the connection between the volcanic centers in Central Kamchatka and the subducting slab. At depths below 40 km depth, we observe two large low-velocity anomalies centered below Zhupanovsky and Mutnovsky volcanoes and covering all other volcanoes in the area. In the vertical sections, the corresponding anomalies of high Vp/Vs ratio have mushroom shapes with the heads spreading along the bottom of the crust, which probably represent the underplating of magma material that feeds the volcanoes of the groups. The tomography results also reveal some important tectonic features, such as a V-shaped fault system in the Avacha Graben, which is the part of the MPZ.
Bergal-Kuvikas Olga, Bindeman Ilya, Chugaev Andrey, Larionova Yulia, Perepelov Alexander, Khubaeva Olga Pleistocene-Holocene Monogenetic Volcanism at the Malko-Petropavlovsk Zone of Transverse Dislocations on Kamchatka: Geochemical Features and Genesis // Pure and Applied Geophysics. 2022. doi: 10.1007/s00024-022-02956-7.
Girina O.A., Malkovsky S.I., Sorokin A.A., Loupian E.A., Korolev S.P. Numerical Modeling of the Ash Cloud Movement from the Catastrophic Eruption of the Sheveluch Volcano in November 1964 // Remote Sensing. 2022. Вып. 14. № 3449. https://doi.org/10.3390/rs14143449.
This paper reconstructs, for the first time, the motion dynamics of an eruptive cloud formed during the catastrophic eruption of the Sheveluch volcano in November 1964 (Volcanic Explosivity Index 4+). This became possible due to the public availability of atmospheric reanalysis data from the ERA-40 archive of the European Center for Medium-Range Weather Forecasts (ECMWF) and the development of numerical modeling of volcanic ash cloud propagation. The simulation of the eruptive cloud motion process, which was carried out using the FALL3D and PUFF models, made it possible to clarify the sequence of events of this eruption (destruction of extrusive domes in the crater and the formation of an eruptive column and pyroclastic flows), which lasted only 1 h 12 min. During the eruption, the ash cloud consisted of two parts: the main eruptive cloud that rose up to 15,000 m above sea level (a.s.l.), and the co-ignimbrite cloud that formed above the moving pyroclastic flows. The ashfall in Ust-Kamchatsk (Kamchatka) first occurred out of the eruptive cloud moving at a higher speed, then out of the co-ignimbrite cloud. In Nikolskoye (Bering Island, Commander Islands), ash fell only out of the co-ignimbrite cloud. Under the turbulent diffusion, the forefront of the main eruptive cloud rose slowly in the atmosphere and reached 16,500 m a.s.l. by 04:07 UTC on November 12. Three days after the eruption began, the eruptive cloud stretched for 3000 km over the territories of the countries of Russia, Canada, the USA, Mexico, and over both the Bering Sea and the Pacific Ocean. It is assumed that the well-known long-term decrease in the solar radiation intensity in the northern latitudes from 1963–1966, which was established according to the world remote sensing data, was associated with the spread of aerosol clouds formed not only by the Agung volcano, but those formed during the 1964 Sheveluch volcano catastrophic eruption
Khubaeva Olga, Bergal-Kuvikas Olga, Sidorov M.D. The Formation and Recharge of the Verkhne-Yuriev Thermal Springs, Paramushir Island, Kuril Islands // Journal of Volcanology and Seismology. 2022. Vol. 3. P. 43-59. doi: 10.1134/S0742046322030034.
Volkova Maria, Shapiro Nikolay, Melnik Oleg, Mikhailov Valentin, Plechov Pavel, Timoshkina Elena, Bergal-Kuvikas Olga Subsidence of the lava flows emitted during the 2012–2013 eruption of Tolbachik (Kamchatka, Russia): Satellite data and thermal model // Journal of Volcanology and Geothermal Research. 2022. doi: 10.1016/j.jvolgeores.2022.107554.
Бергаль-Кувикас О.В., Биндеман И.Н., Чугаев А.В., Рогозин А.Н. Изотопно-геохимические характеристики игнимбритов Верхнеавачинской кальдеры, Восточный вулканический пояс Камчатки // Вулканизм и связанные с ним процессы. Материалы XXV ежегодной научной конференции, посвящённой Дню вулканолога, 30-31 марта 2022 г. Петропавловск-Камчатский: ИВиС ДВО РАН. 2022. С. 16-18.
Гирина О.А., Константинова А.М., Крамарева Л.С., Сорокин А.А., Маневич А.Г., Мельников Д.В., Романова И.М., Уваров И.А., Мальковский С.И., Королев С.П. Эксплозивное событие 19 апреля 2022 г. вулкана Карымский (Камчатка) по спутниковым данным // Современные проблемы дистанционного зондирования Земли из космоса. 2022. Т. 19. № 2. С. 255-260. https://doi.org/10.21046/2070-7401-2022-19-2-255-260.
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).
Гирина О.А., Ладыгин В.М. Активность вулкана Безымянный (Камчатка) // Материалы XII Международной школы по наукам о Земле имени профессора Л.Л. Перчука (ISES-2022). Петропавловск-Камчатский: ИВиС ДВО РАН. 2022. С. 27