Estimation of Stress Values in the Method of Cataclastic Analysis of Shear Fractures

摘要

The possibility of estimation of tectonic stress values through the method of cataclastic analysis (MCA) of shear fractures [1] appeared after the development of its algorithm of the second stage of reconstruction, oriented at calculation of relative values of spherical and deviator components of stress the tensor. After the first stage of this method, through the data on a group of focal mechanisms from a homogenous sample of earthquakes, three Euler angles are calculated, which determine the orientations of the three main axes of the tensor, and the value of the Lode-Nadai coefficient μ_σ, which characterizes the type of stress tensor.