Electromagnetic Effects during Relaxation Processes in the Earth's Inhomogeneous Crust

摘要

This paper reports data on the joint recording of microseismic oscillations and the electric field in near-surface sectors of the Earth's crust. Based on the results of their analysis, we propose a model for the source of low-frequency electromagnetic signals as an electric dipole generated by the constrained rotation of structural blocks during the relaxation of a medium with a low moisture content. According to this model, separation of electric charges and generation of currents are related to the breakdown of mechanical bonds between the neighboring blocks during differential motions or to the electric polarization of rock during a dramatic variation in the stressed state.