UDC 550.844+546.791.027+632.126

https://doi.org/10.26516/2541-9641.2025.3.126

EDN: VTCVBH

Operational Analysis of Crustal Extension and Compression in the Baikal Rift System from Real-Time Variations in Groundwater Oxidation-Reduction Potential: Assessment of the relationship between Force and Seismic pulses

S.V. Rasskazov^1,2, E.P. Chebykin^1,4, S.V. Snopkov^2,3, I.A. Aslamov⁵,

V.I. Archipenko⁵, A.M. Ilyasova¹

¹Institute of the Earth's Crust SB RAS, Irkutsk, Russia

²Irkutsk State University, Irkutsk, Russia

³A.P. Vinogradov Institute of Geochemistry SB RAS, Irkutsk, Russia

⁴Irkutsk National Research Technical University, Irkutsk, Russia

⁵Limnological Institute SB RAS, Irkutsk, Russia

Abstract. The seismogenic state of the earth's crust in the Baikal Rift System (BRS) is assessed in the spring and summer 2025. Spatio-temporal distribution of earthquakes are defined two pulses: 1) April 30 – June 12 (pulse AJ) and 2) June 17 – August 13 (pulse JA). Earthquakes of the former pulse are traced in the eastern and western BRS with subsequent concentration and extinction in the west, earthquakes of the latter one are identified in the eastern BRS with shift to its center and extinction. Seismogenic effects of compression or extension forces of the crust are determined by coseismic coordinated variations in groundwater ORP at the Kultuk area. It is augured that the AJ seismic pulse is initiated due to forces of the both Japan-Baikal Geodynamic Corridor (JBGC) and Sayan-Mongolian Sector of Indo-Asian Convergence (SMSIAC), while the JA one is resulted only from the JBGC forces.

Keywords: groundwater, monitoring, oxidation-reduction potential, earthquakes, Baikal

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Rasskazov Sergei Vasilevich,

doctor of geological and mineralogical sciences, professor,

664025, Irkutsk, Lenin st., 3,

Irkutsk State University, Faculty of Geology,

Head of Dynamic Geology Char,

664033, Irkutsk, Lermontov st., 128,

Institute of the Earth's Crust SB RAS,

Head of the Laboratory for Isotopic and Geochronological Studies,

tel.: (3952) 51–16–59,

email: rassk@crust.irk.ru

Chebykin Eugene Pavlovich,

Candidate of Chemical Sciences, Senior Researcher,

664033, Irkutsk, Lermontov st., 128,

Institute of the Earth's Crust SB RAS,

664033, Irkutsk, Ulan-Batorskaya st., 3,

Limnological Institute SB RAS,

email: epcheb@yandex.ru

Snopkov Sergei Viktorovich,

Candidate of Geological and Mineralogical Sciences,

664025, Irkutsk, Lenin sr., 3,

Irkutsk State University, Faculty of Geology,

Associate Professor,

664074, Irkutsk, Kurchatov st., 3,

Siberian School of Geosciences, Irkutsk National Research Technical University,

Leading Researcher,

email: snopkov_serg@mail.ru.

Aslamov Ilya Aleksandrovich,

Candidate of physical and mathematical sciences, Senior Researcher,

664033, Irkutsk, Ulan-Batorskaya st., 3,

Limnological Institute SB RAS,

email: ilya_aslamov@bk.ru.

Arkhipenko Vladislav Ivanovich,

Main Electronics Engineer,

664033, Irkutsk, st. Ulan-Batorskaya, 3,

Limnological Institute SB RAS,

email: vladarxip@gmail.com.

Ilyasova Aigul Maratovna,

candidate of geological and mineralogical sciences,

664033, Irkutsk, Lermontov st., 128,

Institute of the Earth's Crust SB RAS,

Leading Engineer

email: ila@crust.irk.ru.