The geoelectrical properties of the earth around the Karymshina multidisciplinary observation site in southern Kamchatka |
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Authors: | Yu F Moroz T A Moroz |
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Institution: | 1.Institute of Volcanology and Seismology, Far East Division,Russian Academy of Sciences,Petropavlovsk-Kamchatskii,Russia |
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Abstract: | This paper is concerned with the Earth’s electromagnetic field, a deep geoelectrical section, and the dynamics of earth conductivity.
This analysis is based on MTS curves along directions that to a first approximation go along and across southern Kamchatka.
It is shown that the longitudinal and transverse MTS curves are subject to the influence of local and regional geoelectrical
inhomogeneities. The coast effect was studied by 3-D numerical modeling. The patterns we have found were used for interpretation
of generalized MTS curves. The resulting parameters of the geoelectrical section were refined by reducing the longitudinal
curve to the standard curve of apparent resistivity. The results from this interpretation are to be refined as more geoelectrical
information is forthcoming. The dynamics of lithospheric conductivity were studied from data acquired during the 2005–2008
monitoring of magnetotelluric impedance in the range of periods between several hundred and several thousand seconds. The
basis for the analysis was assumed to be the transverse impedance and its phase. The latter was found to exhibit anomalous
bay fluctuations that might have been related to earthquakes. A possible origin of these anomalies is discussed. |
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