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Russian Geology and Geophysics

2008 year, number 5

Array magnetotelluric soundings in the active seismic area of Northern Tien Shan

A.K. Rybina, V.V. Spichak b , V.Yu. Batalev a , E.A. Bataleva a , V.E. Matyukov a
a Research Station, Russian Academy of Sciences, Bishkek, 720049, Kyrgyzstan
b Geoelectromagnetic Research Center, Shmidt Institute of Physics of the Earth, Russian Academy of Sciences, P.O. Box 30, Troitsk,
Moscow Region, 142190, Russia
Keywords: Crust; faults; thrust; MT soundings; electrical conductivity structure; impedance tensor; Tien Shan
Pages: 337-349


High-density array MT soundings of the crust in the seismically active northern Tien Shan were performed using Phoenix MTU-5 stations in the Bishkek Geodynamic Polygon, at the junction of the Chu basin and the Kyrgyz Range. The MT transfer functions were determined to an accuracy of 1-2% (amplitude) and about 0.5-0.8 deg (phase) in most of 145 soundings. Preliminary analysis of the collected data aimed at estimating the geoelectrical dimensionality. The Bahr decomposition analysis indicated the presence of local 3D structures in the crust of the area superposed on the regional 2D structure.