Indicators of Changes in the Stress-Strain State of the Geoenvironment in the Preparation and Realization of Strong Tectonic Earthquakes According to Long-Term Measurements with Underground Electric Antennas

Abstract

We present the main results of the first stage of the study aimed at revealing the indicators of the changes in the stress-strain state (SSS) of the geoenvironment from the data of the long-term electromagnetic measurements with underground electric antenna in the Petropavlovsk-Kamchatskii geodynamic test site (PGS). Indicators are the most informative parameters. Their changes are associated with the preparation of nearby strong tectonic earthquakes. The physical basis of the method is the relationship between changes in the moisture content of a large volume of rock and tectonic stresses affecting the geoenvironment. We assume that such package of SSS indicators will be formed for the PGS on the basis of long-term complex borehole measurement data including measurements with underground electric antennas. We demonstrate the results of a comparison of the data on monitoring variations of the resistivity of rock to the results of other types of measurements carried out at the PGS.