Surface oscillations - A possible source of fracture induced electromagnetic radiation

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137 Scopus citations

Abstract

Radio frequency electromagnetic radiation (EMR) registered hundreds of kilometres away from an earthquake epicentre is detected hours before earthquakes. Yet, accurate earthquakes prediction by their self-induced EMR still remains in its infancy due in part to the lack of understanding of EMR's origin. Here we present a viable model of this origin, according to which EMR is emitted by an oscillating dipole created by ions moving collectively as a surface wave on both sides of the crack; when the crack halts, the EMR pulse amplitude decays by interaction with bulk phonons. The model is shown to be able to provide crack dimensions and velocities, to explain some general similarities of different fracturing processes and indicate the existence of a general failure mechanism. Results raise the hope of developing an EMR based genuine earthquake prediction system.

Original languageEnglish
Pages (from-to)15-21
Number of pages7
JournalTectonophysics
Volume431
Issue number1-4
DOIs
StatePublished - 20 Feb 2007

Keywords

  • Earthquake
  • Electromagnetic radiation
  • Fracturing

ASJC Scopus subject areas

  • Geophysics
  • Earth-Surface Processes

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