S.V. Rasskazov1,2, A.M. Ilyasova1, S.A. Bornyakov1, E.P. Chebykin1,3
1Institute of the Earth's Crust SB RAS, Irkutsk, Russia
2Irkutsk State University, Irkutsk, Russia
3Liminological Institute, SB RAS, Irkutsk, Russia
Rasskazov Sergei Vasilievich,
doctor of geological and mineralogical sciences, professor,
664025 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
Head of Dynamic Geology Chair,
664033 Irkutsk, st. Lermontova, 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.
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.
Bornyakov Sergey Alexandrovich,
candidate of geological and mineralogical sciences,
664033 Irkutsk, Lermontov st., 128,
Institute of the Earth's Crust SB RAS,
Leading Researcher,
email: bornyak@crust.irk.ru.
Chebykin Evgeny Pavlovich,
Candidate of Chemical Sciences,
664033 Irkutsk, st. Lermontova, 128,
Institute of the Earth's Crust SB RAS,
664033 Irkutsk, st. Ulan-Batorskaya, 3,
Limnological Institute SB RAS,
Senior Researcher,
email: epcheb@yandex.ru.
Abstract. Variations of Si, Na, Li, 234U activity, and 234U/238U activity ratio in thermal and cold groundwaters, as well as cooled hydrotherms from active faults in the SE coastal area of Middle Baikal are considered. For the Maksimikha area, hydrogeochemical monitoring data of 2013–2015 with interpretation in terms of chemical hydrogeodynamics: temperature, depth of water reservoir and opening–closing of microcracks for circulating water. When comparing series of hydrogeochemical monitoring with a series of earthquakes K = 10.5–12.7 of the Goryachinsk seismic reactivation in Middle Baikal, an increased sensitivity of responses to earthquakes at the station of cooled hydrotherms from the transition zone of the lower hydrogeodynamic floor is revealed in comparison with the responses of fracture-derived cold water from the upper floor. The Maksimikha groundwater reservoir is considered as a representative reservoir located along the in the Yambuy transtension zone that is lateral structure of the South Baikal basin. Coseismic hydrogeodynamics of the Maksimikha reservoir in 2013–2015 is referred to the time interval preceding the landmark Goloustnoye earthquake on September 05, 2015, which corresponded to the conditions of maximum compression of the crust of the Kultuk reservoir, localized at the main structural line of the Baikal Rift System, in the 2008–2020 seismogeodynamic cycle.
Keywords: groundwater, monitoring, Na/Li, 234U/238U, 234U, earthquake, friction clay, Baikal.
P. 108–145
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