Electromagnetic radiation related to dislocation dynamics in a seismic preparation zone

• Main Authors: T. Ernst, R. Teisseyre
• Format: Article
• Language: English
• Published: Istituto Nazionale di Geofisica e Vulcanologia (INGV) 2002-06-01
• Series: Annals of Geophysics
• Subjects: stress evolution; instabilities; charge dislocations; electromagnetic emission
• Online Access: http://www.annalsofgeophysics.eu/index.php/annals/article/view/3513

Electromagnetic emission is observed frequently before earthquakes as high noise level in VLF and ULF bands. We present theoretical considerations on electromagnetic radiation caused by dislocation dynamics in the preseismic micro-sources (micro-crackings) located in an earthquake preparation zone. Some of these micro-sources could be located near the ground surface and their electromagnetic signals could be accesible in some recording stations. The examples of the numerically simulated induction and radiation fields are given and one example of the observed radio-noise recording is shown.