The Murman-2018 Experiment on Remote Sensing in Order to Study the “Impenetrability” Boundary at the Transition between Brittle and Plastic States of the Crystalline Earth’s Crust

Abstract

This paper describes the Murman-2018 experiment on remote electromagnetic sounding in combination with frequency and audio magnetotelluric soundings. The experimental results made it possible to quantify for the first time in the scientific literature the position of the boundary of a sharp increase in rock resistivity at a depth of 10–15 km. The nature of the established boundary (the “impenetrability” boundary for direct current) is related to the transition of rock properties in the Earth’s crust from the fragile state in the upper crust to a plastic state at a depth of 10–15 km or more.