Relationship between timing of earthquakes of the Baikal-Khubsugul reactivation and oxidation–redox potential in groundwaters from the Kultuk polygon

Timing of earthquakes is determined by an entry of active faults in the central part of the Baikal Rift System into a metastable (preseismic) state during the development of a complete seismogeodynamic cycle. Based on a role of fluid flows as possible triggers for seismogenic deformations, in determining earthquake timing of the Baikal-Khubsugul reactivation of 2020–2023, we take into account: 1) decreasing atmospheric pressure, 2) matching–mismatching mode of oxidation–redox potential (ORP) in different stations, and 3) overall ORP decreasing in groundwaters from monitoring stations of the Kultuk polygon.