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Acta Geodaetica et Geophysica

, Volume 53, Issue 4, pp 555–577 | Cite as

Underground current impulses as a possible source of unipolar magnetic pulses

  • P. NenovskiEmail author
Original Study
  • 52 Downloads

Abstract

Recently several cases of observations of unipolar magnetic field pulses associated with earthquakes at different points (California, Italy, Peru) have been recorded. The paper attempts to model unipolar magnetic field pulses based on one mechanism that should be omnipresent for all measurement points, namely, the magnetic field diffusion through a conductive medium. The structure of magnetic fields supported by electric current sources is thoroughly modelled. The source of electric current is considered as an elongated volume of finite cross-section being immersed in a conductive medium. To model the unipolarity feature of the observed pulses prior to and at the earthquake main shock, the electric current of the source is of impulse form. Special attention is paid to the differences in the pulse structure (as amplitude envelope and the pulse width) that are measured by various magnetometers (fluxgate or search-coil). An analysis and comparison with recorded magnetic field pulse characteristics reveal that the observed unipolar pulses may have a common genesis, an electric current source within a conductive medium such as the earth crust.

Keywords

Unipolar magnetic pulses Electric current density Volume and cross-section of the current source Conductivity medium Earth crust 

Notes

Acknowledgements

The author is grateful to professors S. Shanov and F. Freund, Dr T. Bleier and Dr R. Glavcheva for stimulating discussions on the topic, their comments and invariable support. The author thanks prof F. Freund for his constructive suggestions during the review process.

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Copyright information

© Akadémiai Kiadó 2018

Authors and Affiliations

  1. 1.University Centre for Space Research and TechnologySofia UniversitySofiaBulgaria

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