Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 113761 10.2205/2026es001124 ornlaf KAMCHATKA EARTHQUAKE M 8.8 ON JULY 29, 2025 KAMCHATKA EARTHQUAKE M 8.8 ON JULY 29, 2025 KAMCHATKA EARTHQUAKE M 8.8 ON JULY 29, 2025 Response of Geofluid Systems to the Activation of Regional Seismicity in Kamchatka in July 2025 Response of Geofluid Systems to the Activation of Regional Seismicity in Kamchatka in July 2025 https://orcid.org/0000-0002-3027-004X Соломатин А. В. Solomatin A. V. https://orcid.org/0000-0001-5468-1452 Кирюхин Алексей В. Kiryukhin Alexey V. AVKiryukhin2@mail.ru https://orcid.org/0000-0003-4934-6873 Поляков А. Ю. Polyakov A. Yu. https://orcid.org/0009-0005-4349-6231 Лемзиков М. В. Lemzikov M. V. Бурнайкин Д. Н. Burnaikin D. N. Петроченко В. П. Petrochenko V. P. https://orcid.org/0000-0002-0762-2959 Копылова Г. Н. Kopylova G. N. https://orcid.org/0000-0003-0251-6994 Рябинин Г. В. Ryabinin G. V. Демьянчук Ю. В. Demyanchuk Yu. V. https://orcid.org/0000-0002-0781-3448 Усачева О. О. Usacheva O. O. Институт вулканологии и сейсмологии ДВО РАН Россия Institute of Volcanology and Seismology FEB RAS Russian Federation Институт вулканологии и сейсмологии ДВО РАН Petropavlovsk Kamchatsky Россия Institute of Volcanology and Seismology FEB RAS Petropavlovsk Kamchatsky Russian Federation Кроноцкий федеральный природный биосферный заповедник Россия Kronotsky Federal Nature Biosphere Reserve Russian Federation Институт вулканологии и сейсмологии ДВО РАН Россия Institute of Volcanology and Seismology FEB RAS Russian Federation Институт вулканологии и сейсмологии ДВО РАН Россия Institute of Volcanology and Seismology FEB RAS Russian Federation АО «Тепло Земли» Россия “Teplo Zemli” JSC Russian Federation АО «Быстринская горная компания» Россия “Bystrinskaya Gornaya Compania” JSC Russian Federation Камчатский филиал Единой геофизической службы РАН Россия Kamchatka Branch of the Geophysical Survey of the Russian Academy of Sciences Russian Federation Камчатский филиал Единой геофизической службы РАН Россия Kamchatka Branch of the Geophysical Survey of the Russian Academy of Sciences Russian Federation Камчатский филиал Единой геофизической службы РАН Россия Kamchatka Branch of the Geophysical Survey of the Russian Academy of Sciences Russian Federation Институт вулканологии и сейсмологии ДВО РАН Россия Institute of Volcanology and Seismology FEB RAS Russian Federation Институт вулканологии и сейсмологии ДВО РАН Россия Institute of Volcanology and Seismology FEB RAS Russian Federation 01 07 2026 01 07 2026 26 2 ES2014 02 02 2026 25 05 2026 https://rjes.ru/en/nauka/article/113761/view

Geofluid systems are unique geomechanical sensors, as they can generate earthquakes themselves and also respond to changes in Earth activity. The MW = 8.8 earthquake of July 29, 2025 in Kamchatka was accompanied by numerous geofluid anomalous phenomena: (1) regional seismogenic faults activity; (2) significant post-seismic decreases in water levels (the first meters) and rates in wells of low temperature geothermal fields (Vilyuchinsky, Paratunsky and Ketkinsky); (3) omissions of eruptions of the Bolshoy geyser (Valley of Geysers) and the emergence of a new geyser-well (Kumroch); (4) the beginning of volcanic eruptions (Krasheninnikov volcano for the first time in ∼600 years, Klyuchevskoy volcano) and volcanoes activity increase (Karymsky, Mutnovsky, Kambalny). In this study, the ability of geofluid systems to track seismic events was used to identify the activity of regional seismogenic faults and volcanic magmatic systems (the Frac-Digger method). This provides an explanation for the observed phenomena in terms of the geomechanical regional stretching of Kamchatka, which was associated with an MW = 8.8 earthquake followed by a decrease in geofluid pressure. In magma systems of volcanoes, this triggered boiling and gas-lift of magma with subsequent eruptions. In the fractured-type reservoirs of low-temperature hydrothermal systems, this led to a significant drop in water levels and a cessation of discharge. In the high-temperature and gas-rich Valley of the Geysers Field, this led to the disintegration of the caprock and the infiltration of water, resulting in the subsequent eruptions of the Grotto and the Great Geyser being skipped, while the Kumroch CO2 reached the hydrothermal reservoir, boiled, and began cycling eruptions. These phenomena are consistent with the models of the MW = 8.8 earthquake’s focal mechanism and satellite geodetic data from GNSS and InSAR.

Geofluid systems are unique geomechanical sensors, as they can generate earthquakes themselves and also respond to changes in Earth activity. The MW = 8.8 earthquake of July 29, 2025 in Kamchatka was accompanied by numerous geofluid anomalous phenomena: (1) regional seismogenic faults activity; (2) significant post-seismic decreases in water levels (the first meters) and rates in wells of low temperature geothermal fields (Vilyuchinsky, Paratunsky and Ketkinsky); (3) omissions of eruptions of the Bolshoy geyser (Valley of Geysers) and the emergence of a new geyser-well (Kumroch); (4) the beginning of volcanic eruptions (Krasheninnikov volcano for the first time in ∼600 years, Klyuchevskoy volcano) and volcanoes activity increase (Karymsky, Mutnovsky, Kambalny). In this study, the ability of geofluid systems to track seismic events was used to identify the activity of regional seismogenic faults and volcanic magmatic systems (the Frac-Digger method). This provides an explanation for the observed phenomena in terms of the geomechanical regional stretching of Kamchatka, which was associated with an MW = 8.8 earthquake followed by a decrease in geofluid pressure. In magma systems of volcanoes, this triggered boiling and gas-lift of magma with subsequent eruptions. In the fractured-type reservoirs of low-temperature hydrothermal systems, this led to a significant drop in water levels and a cessation of discharge. In the high-temperature and gas-rich Valley of the Geysers Field, this led to the disintegration of the caprock and the infiltration of water, resulting in the subsequent eruptions of the Grotto and the Great Geyser being skipped, while the Kumroch CO2 reached the hydrothermal reservoir, boiled, and began cycling eruptions. These phenomena are consistent with the models of the MW = 8.8 earthquake’s focal mechanism and satellite geodetic data from GNSS and InSAR.

 Frac-Digger fluid pressure geomechanics magma boiling CO2 gas-lift regional extension geysers water level drop eruptions volcanoes faults Kamchatka megathrust earthquake Frac-Digger fluid pressure geomechanics magma boiling CO2 gas-lift regional extension geysers water level drop eruptions volcanoes faults Kamchatka megathrust earthquake The study was conducted under the FWME-2024-0007 project at the Institute of Volcanology and Seismology of the Far Eastern Branch of the Russian Academy of Sciences. The authors express their gratitude to O. V. Bergal-Kuvikas for discussing the results, to V. I. Shevtsova for conducting observations at well R27, and to A. P. Korchagina, G. N. Markevich and E. V. Chernykh for their technical support, the authors also thank A. A. Lyubin, Director of the “Renewable Energy” branch of Kamchatskenergo PJSC, and M. L. Bezotechestvo, Head of the Mutnovsky Geothermal Power Plants, N. A. Romanov, Lead Hydrogeologist, for supporting the field studies at the Mutnovsk geothermal field and providing data on pressure and temperature changes at the condenser of the M GeoPP. The data used in the work were obtained with large-scale research facilities “Seismic infrasound array for monitoring Arctic cryolitozone and continuous seismic monitoring of the Russian Federation, neighbouring territories and the world” (https://ckp-rf.ru/usu/507436/, http: //www.gsras.ru/unu/). The study was conducted under the FWME-2024-0007 project at the Institute of Volcanology and Seismology of the Far Eastern Branch of the Russian Academy of Sciences. The authors express their gratitude to O. V. Bergal-Kuvikas for discussing the results, to V. I. Shevtsova for conducting observations at well R27, and to A. P. Korchagina, G. N. Markevich and E. V. Chernykh for their technical support, the authors also thank A. A. Lyubin, Director of the “Renewable Energy” branch of Kamchatskenergo PJSC, and M. L. Bezotechestvo, Head of the Mutnovsky Geothermal Power Plants, N. A. Romanov, Lead Hydrogeologist, for supporting the field studies at the Mutnovsk geothermal field and providing data on pressure and temperature changes at the condenser of the M GeoPP. The data used in the work were obtained with large-scale research facilities “Seismic infrasound array for monitoring Arctic cryolitozone and continuous seismic monitoring of the Russian Federation, neighbouring territories and the world” (https://ckp-rf.ru/usu/507436/, http: //www.gsras.ru/unu/).

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