Significant ELF perturbations in the Schumann Resonance band before and during a shallow mid-magnitude seismic activity in the Greek area (Kalpaki)

Abstract

Strong ELF perturbations in the Schumann Resonance band (0–50 Hz) were detected in the North of Greece close to the village of Kalpaki during a shallow (17 km) mid-magnitude earthquake (5,3R) and the post-seismic sequence that followed it. The observation site was serendipitously located almost above the main quake epicenter (3,65 km away). It is probably the first time that such a detailed recording of ELF electromagnetic emission of lithospheric and/or ionospheric origin was obtained so close to a seismic epicenter. This event is very significant in the study of the interaction between seismic waves and ELF electromagnetic radiation. It will certainly contribute to the understanding of that interaction, and may even lead to more accurate earthquake predictions.