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An analytical solution of pore pressure equations with a perturbation source in the form of lunar-solar tidal deformations is generalized to the case of a model with the arbitrary number of layers. The electric field of electrokinetic nature is calculated. The sensitivity of pore pressure and its vertical derivative to the elastic properties and permeability of rock strata is evaluated. The program code for solving the inverse problem capable of recovering the Biot modulus and Biot coefficient as well as permeability coefficient in a horizontally layered model is developed. The possibilities of mapping these parameters are discussed including their study from the borehole measurements of the vertical electric field of electrokinetic origin.

izvestiâ akademii nauk sssr. fizika zemli

Tidal generated electric field in the multi-layer structure and the possibilities of its employment for deriving the elastic properties and permeability of the subsurface formations