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Institute of Geoelectromagnetic Research, Russian Academy of Sciences, Troitsk, Moscow Region, Russia
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- PublicationOpen AccessTectonic process monitoring by variations of the geomagnetic field absolute intensity(1997-03)
; ; ; ;Avdeev, D. B.; Institute of Geoelectromagnetic Research, Russian Academy of Sciences, Troitsk, Moscow Region, Russia ;Kuvshinov, A. V.; Institute of Geoelectromagnetic Research, Russian Academy of Sciences, Troitsk, Moscow Region, Russia ;Pankratov, O. V.; Institute of Geoelectromagnetic Research, Russian Academy of Sciences, Troitsk, Moscow Region, Russia; ; We propose a novel technique for tectonic process monitoring. The technique includes: measurements of absolute intensity variations, at network sites, synchronously with measurements of horizontal geomagnetic field variations at a reference site; spectral analysis of measured time series and construction non-conventional transfer functions and interpretation of the transfer functions constructed in order to detect or/and to forecast the tectonic processes. Using numerical modelling we show the sensitivity of transfer functions obtained with respect to the temporal changes in the Earth's resistivity associated with tectonic processes. We also demonstrate that the components of the geomagnetic field are reconstructed in terms of spatial distribution of absolute intensity variations.107 98 - PublicationOpen AccessEz-response as a monitor of a Baikal rift fault electrical resistivity: 3D modelling studies(2004)
; ; ; ; ; ;Pankratov, O. V.; Geoelectromagnetic Research Institute, Russian Academy of Sciences, Moscow Region, Russia ;Kuvshinov, A. V.; Geoelectromagnetic Research Institute, Russian Academy of Sciences, Moscow Region, Russia ;Avdeev, D. B.; Geoelectromagnetic Research Institute, Russian Academy of Sciences, Moscow Region, Russia ;Shneyer, V. S.; Geoelectromagnetic Research Institute, Russian Academy of Sciences, Moscow Region, Russia ;Trofimov, I. L.; Geoelectromagnetic Research Institute, Russian Academy of Sciences, Moscow Region, Russia; ; ; ; 3D numerical studies have shown that the vertical voltage above the Baikal deep-water fault is detectable and that respective transfer functions, Ez-responses, are sensitive to the electrical resistivity changes of the fault, i.e. these functions appear actually informative with respect to the resistivity «breath» of the fault. It means that if the fault resistivity changed, conventional electromagnetic instruments would be able to detect this fact by measurement of the vertical electric field, Ez, or the vertical electric voltage just above the fault as well as horizontal magnetic field on the shore. Other electromagnetic field components (Ex, Ey, Hz) do not seem to be sensitive to the resistivity changes in such a thin fault (as wide as 500 m). On the other hand, such changes are thought to be able to indicate a change of a stress state in the earthquake preparation zone. Besides, the vertical profile at the bottom of Lake Baikal is suitable for electromagnetic monitoring of the fault electrical resistivity changes. Altogether, the vertical voltage above the deep-water fault might be one of earthquake precursors.109 233