Numerical model of the selectivity effect and the ΔV/L criterion

Details Numerical model of the selectivity effect and the ΔV/L criterion Numerical model of the selectivity effect and the ΔV/L criterion

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3245s&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 21, p. 3245-3248

Physics

Geophysics

28

Electromagnetics: Electromagnetic Theory, Mathematical Geophysics: Modeling, Mathematical Geophysics: Numerical Solutions, Seismology: Seismic Hazard Assessment And Prediction

Scientific paper

Numerical solutions of Maxwell equations for a model earth with a reasonably conducting channel indicate that the electric field values are intensified within a certain region only (i.e., above the end of the channel), thus explaining the observed selectivity effect. In this region, the electric field may reach detectable values (5-10mV/km), while the magnetic field still remains low (10-2nT). The results are compatible with those obtained recently by analytical solutions (Varotsos et al. [1998]). Both the numerical and the analytical solutions lead to a natural explanation of the ΔV/L~const criterion. This criterion, however, should not be applied over an area with strongly inhomogeneous electrical structure.

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