Comparison of Stress Azimuth Data Derived by Geogenic Electromagnetic Radiation Technique and from the Analysis of Exhumation Joints

During the last decade, considerable progress has been made to understand the cause and nature of electromagnetic emission anomalies that precede major earthquakes^1,2. Based on field measurements using a portable instrument, the preferred orientations of geogenic electromagnetic radiation (EMR), especially the principal directions of radiation have been proved to be reproducible and are related to the stress field of the lithosphere^{3– 6}.