Abstract
Secular variation anomalies (SVA) of two types were revealed as a result of high-precision measurements of the geomagnetic field in the Urals. The results suggest significantly non-uniform tectonic stresses in the Urals. An attempt to measure the time dependence of stress variations was made. An anomaly of the first type is characterized by the steady growth of the field at a rate of 2–3 nT/year. Laboratory experiments with the rocks showed that similar changes might be caused by the changes of magnetic susceptibility and remanent magnetization with changes of hydrostatic pressure of about 10 bars. The anomalies of second type border the zone of folded Urals to the East and the West. They exhibit sign changes in trends of up to ±20 nT/year. These anomalies are probably caused by the change of the rock conductivity because of changes in pore pressure in the zones of thrusting.
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References
Barsukov, O.M., L.S. Bezuglaia, V.N. Vadkovsky, and Yu.P. Skovorodkin, About a nature of one secular variation anomaly of the earth’s magnetic field, Izv. Acad. Sci. USSR, Fizika Zemli, 9, 85–90, 1968.
Bezuglaia, L.S., S.H. Maksudov, and Yu.P. Skovorodkin, Viscous magnetization of the rocks under pressure, Izv. Acad. Sci. USSR, Fizika Zemli, 4, 110–114, 1973.
Bugaylo, V.A., V.S. Druzhinin, G.G. Orlov, and L.F. Ribalka, On geological structure of the Manchazh regional anomaly nature, in Structure and Development of the Earth’s Crust and Ore Fields of the Urals due to Geophysical Data, 29–35, Ural Scientific Center, U.S.S.R. Academy of Sciences, Sverdlovsk, 1976.
Bulashevitch, Yu.P. and V.A. Shapiro, Anomaly of the geomagnetic field secular variation of the Arti observatory, Geomagnetism y Aeronomia, 15, 382–384, 1975.
Bulashevitch, Yu.P., A.L. Aleynikov, O.V. Bellavin, V.A. Bugaylo, N.I. Khalevin, V.A. Shapiro, I.F. Tavrin, N.P. Vlokh, and A.V. Zubkov, Geodynamics of the Urals, Tectonophysics, 35, 15–26, 1976.
Ivanov, N.A., A.A. Nulman, and V.A. Shapiro, Reversible and irreversible changes in TRM under hydrostatic compression, in Constant Geomagnetic Field, Paleomagnetism and Rock Magnetism, edited by G.N. Petrova, pp. 148–150, Naukova dumka, Kiev, 1973.
Martin, J.C., The effect of fluid pressure on effective stresses and induced faulting, J. Geophys. Res., 80, 3783–3785, 1975.
Mizutani, H. and T. Ishido, A new interpretation of magnetic field variation associated with the Matsushiro earthquake, J. Geomag. Geoelectr., 28, 179–188, 1976.
Nagata, T., Rock Magnetism, pp. 258–288, Maruzen, Tokyo, 1961.
Nur, A. and J.D. Byerlee, An exact effective stress law for elastic deformation of rock with fluids, J. Geophys. Res., 76, 6414–6419, 1971.
Osika, D.G., A.B. Megaev, T.S. Yankovskaya, and O.A. Saidov, Hydrogeochemical anomalies, precursory of earthquakes as reflection of the conditions of its focal zone formation, Dokl. Acad, Sci. USSR, 233, 74–78, 1977.
Shapiro, V.A., Seismomagnetic effect, Izv. Acad. Sci. USSR, Fizika Zemli, 8, 61–74, 1968.
Shapiro, V.A. and N.A. Ivanov, Investigations of secular variation anomalies in the Middle Ural region, J. Geophys., 40, 435–438, 1974.
Shapiro, V.A., Local secular variation anomalies and earthquake prediction problem, in Earthquake Forerunners Searching, edited by E.F. Savarensky, pp. 200–207, Fan Publishers, Uzbek SSR, Tashkent, 1976.
Shapiro, V.A. and V.A. Pyankov, Current anomaly of the geomagnetic field T secular variation in Bashkiria, Geomagnetism y Aeronomia, 16, 943–945, 1976.
Sobolev, G.A., V.N. Bogaevsky, R.A. Lementueva, N.I. Migunov, and A.A. Khromov, Investigation of mechanoelectric events in the seismoactive region, in Physics of Earthquake Focus, edited by M.A. Sadovsky, pp. 184–223, Nauka, Moskow, 1975.
Stacey, F.D., K.G. Barr, and G.R. Robson, The volcano-magnetic effect, Pure Appl. Geophys., 62, 96–108, 1965.
Trukhin, V.I., Introduction in Rock Magnetism, pp. 233–238, MGU, Moskow, 1973.
Vishnev, V.S., A.G. Krasnobaeva, V.V. Kormiltsev, and A.E. Ritsk, Magnetic deep sounding in the Middle Ural region, in Memories of Institute of Geophysics, pp. 26–30, Ural Scientific Center, U.S.S.R. Academy of Sciences, Sverdlovsk, 1972.
Zubkov, S.I. and V.I. Myachkin, About permanent rigidity of rock masses of earthquake focal zones, in Physics of Earthquake Focus, pp. 57–67, Nauka, Moskow, 1975.
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Shapiro, V.A., Aleinikov, A.L., Nulman, A.A., Pyankov, V.A., Zubkov, A.V. (1979). Secular Variation Anomalies and Aseismic Geodynamic in the Urals. In: Fuller, M., Johnston, M.J.S., Yukutake, T. (eds) Tectonomagnetics and Local Geomagnetic Field Variations. Advances in Earth and Planetary Sciences, vol 5. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-9825-0_4
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DOI: https://doi.org/10.1007/978-94-010-9825-0_4
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