NHESSD Natural Hazards and Earth System Sciences Discussions NHESSD Nat. Hazards Earth Syst. Sci. Discuss. 2195-9269 Göttingen, Germany 10.5194/nhessd-2-6475-2014 Estimate of ULF electromagnetic noise caused by a fluid flow during seismic or volcano activity Surkov V. V. 1 Pilipenko V. A. https://orcid.org/0000-0003-3056-7465 2 National Research Nuclear University "MEPhI", Moscow, Russia Institute of Physics of the Earth, Moscow, Russia 14 10 2014 2 10 6475 6497 Copyright: © 2014 V. V. Surkov 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://nhess.copernicus.org/preprints/2/6475/2014/nhessd-2-6475-2014.html The full text article is available as a PDF file from https://nhess.copernicus.org/preprints/2/6475/2014/nhessd-2-6475-2014.pdf

The elaboration of theoretical models, even oversimplified, capable to estimate an expected electromagnetic effect during earthquake preparation process is not less important than the advancement of observational technique to detect seismic-related electromagnetic emission. Here possible mechanisms of ULF electromagnetic noise associated with seismic or volcanic activity are discussed. The electrokinetic (EK) and magnetohydrodynamic (MHD) effects due to an irregular flow of conducting rock fluid or magma flow are being revised. The conventional theory of EK effect in a water-saturated rocks has been advanced by consideration of elliptic-shaped channels. A contribution of both mechanisms to observed ULF signal on the ground is shown to be dependent on the pore channel size/rock permeability. Estimates of magnetic and telluric perturbations caused by magma motion along a volcano throat indicate on the important role of the surrounding rock conductivity. These estimates have proven that the mechanisms under consideration are able to generate ULF electromagnetic emission which could be detected by modern magnetometers under favorable conditions.

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