From 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.

From 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.

There are reported gas chromatography, gas chromatography/mass spectrometry and carbon isotopic data on the oils sampled in caldera of the Uzon volcano (East Kamchatka). The Uzon volcano is located in the west of the eastern Kamchatka basin which is made up of thick Paleogene-Neogene sedimentary rocks. Its caldera is made up of lacustrine volcanogenic-sedimentary formations of Pleistocene age (38–70 thousand years), lying on dense basalts. Two samples studied were heavy oils (0.915 g/ml) and contained 2 sulfur; 2.5 paraffin, 9.3 waxes; 1.4 wt olefinic hydrocarbons. Their gas chromatograms show a mono-modal distribution for n-alkanes with a maximum at C18. Pristane/Phytane concentration ratios were measured to be 0.48–0.52. Olefinic hydrocarbons were interpreted to be of hydrothermal origin. Sterane and triterpane biomarkers indicated a low maturation degree and a lacustrine orgin of the initial organic matter. The Uzon oil was found to be isotopically heavy with a δ13C value of −21‰14C isotope was detected, which indicates that recent plant organic matter was significantly involved in oil generation process.