Institute of Volcanology and Seismology
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Multipurpose Studies of the Karymsky Volcano during the Inter-Eruptive Period from August 14–28, 2024
No full textFrom August 14 to 26, 2024, a comprehensive expedition of the Institute of Volcanology and Seismology of the Far Eastern Branch of the Russian Academy of Sciences worked at the Karymsky Volcanic Center (KVC). Research was conducted to restore the hydrochemistry of Karymsky Lake after the catastrophic underwater eruption that occurred in the Academy of Sciences caldera in early January 1996, and a detailed geochemical survey was made of all thermal manifestations in the center. Seismic observations and assessment of the emission of volcanic gas SO2 were carried out, as carried out by the Karymsky volcano, the volume of above-ground CO2 degassing was measured at the thermal sites of the Karymskaya and Academy of Sciences calderas, and samples of spring water were taken to determine the chemical composition and analyze trace elements. Infrared survey and aerial photography of the southern sector of the KVC were carried out.
This publication presents the first results of seismic observations in conjunction with an assessment of the emission of the SO2 volcanic gas, information on the chemical and mineral composition of the springs of the Karymskaya caldera, and aerial photography data of the volcano
Комплексные исследования вулкана Карымский в межэруптивный период с 14 по 28 августа 2024 года
Get PDFВ августе 2024 г. были проведены комплексные научные исследования в районе вулкана Карымский, Камчатка. По данным инструментальных наблюдений показано, что в период межэруптивного внешне спокойного состояния вулкан продолжает интенсивную деятельность, выраженную в сейсмических событиях и интенсивной дегазации
Мегакристаллы амфибола из пирокластического материала южного склона Кроноцкого вулкана (Камчатка)
Get PDFОписаны морфология и состав мегакристаллов амфибола (1-8 см), обнаруженных в пирокластическом материале эруптивных центров Кроноцкого вулкана. На основе результатов изучения состава, морфологии и взаимоотношений мегакристаллов, вмещающей пирокластики и ксенолитов оливиновых клинопироксенитов предполагается реакционное происхождение амфибола
Diverse Lavas of the Tigilsky Dol and Mount Oxi Massif (Sredinny Range, Kamchatka): a Perspective from the New Sr–Nd Isotope Data
No full textUnique compositional diversity of volcanic rocks was recently discovered in an active fault zone of the Sredinny Range (Kamchatka) located in the zone of monogenetic volcanism near the Tigil and Oxi volcanoes. The lavas in the zone represent common for SR medium-K, high-K and high-Ti, and also unique for Kamchatka high-LREE and high-Mg varieties. In this contribution, we present new Sr-Nd isotope data for a representative set of lava samples from this area. The isotopic and geochemical characteristics of the majority of selected samples can be explained by the differences in the amount of fluid, fluid sources and melting conditions, proposed earlier for the SR. The high-LREE picritic basalts, however, differ significantly from the other Kamchatka volcanic rocks—their highly unusual high-LREE, high-Li and low-LILE geochemical characteristics combine with the highest 87Sr/86Sr (0.70365) and second-highest εNd (9.9) values ever reported for lavas from the SR. We suggest that they represent the product of melting of the specific SR lithosphere domain that has been metasomatized by melts derived from a strongly degassed slab
Крупномасштабные обрушения вулканов Авачинский и Корякский и связанные с ними катастрофические извержения – главная опасность для городов Петропавловск-Камчатский и Елизово
Get PDFНа основе общих закономерностей проявления крупномасштабных обрушений вулканических построек сделан вывод, что современные постройки вулканов Авачинский и Корякский потенциально к ним готовы. Рассмотрены возможные сценарии будущих обрушений, которые показывают, что их обломочные лавины могут достичь населенных пунктов Петропавловска-Камчатского и Елизово
The Verkhne-Yuriev Thermal Springs: The Evolution of Chemical and Isotope Compositions (1952–2022) in Relation to Active Periods of Ebeko Volcano, Paramushir Island
No full textThis paper describes the chemical composition of the thermal waters discharging on the northwestern slope of the active Ebeko Volcano in the Yuriev River valley. We are using continuous multiyear observations of the evolution of chemical and isotope compositions to estimate the response of volcanic events to the state of the hydrothermal system. It is shown that phreatomagmatic eruptions of the volcano were preceded by a change in the chemical and isotope compositions of thermal waters caused by increased inflow of magmatic volatiles into the system. The springs are observed to show increased concentrations of anion-generating components (chloride, sulfate, and fluorine ions) with concurrent increases in heavier isotopes of oxygen and hydrogen (deuterium) toward “andesitic” water. Recalling that the changes were detected a few months before the eruption, we infer that such geochemical effects can serve as predictive markers when monitoring the state of the volcano
Современные компьютерные технологии: применение для оперативного мониторинга активных вулканов Камчатки и Курил и прогноза их опасности для авиаперевозок
Get PDFРассматриваются разработанные совместными усилиями ученых из KVERT ИВиС ДВО РАН, ИКИ РАН, ВЦ ДВО РАН и ДВ НИЦ «Планета» компьютерные системы, предназначенные для комплексного оперативного и ретроспективного анализа активности вулканов Дальнего Востока