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

• Published in: Russian geology and geophysics Vol. 49; no. 5; pp. 337 - 349
• Main Authors: Rybin, A.K., Spichak, V.V., Batalev, V.Yu, Bataleva, E.A., Matyukov, V.E.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2008; Allerton Press
• Subjects: applied (geophysical surveys & methods); arrays; Asia; Bishkek Kyrgyzstan; Central Asia; Chu River basin; Commonwealth of Independent States; Crust; deep sounding; deep-seated structures; earthquakes; electrical conductivity; electrical conductivity structure; faults; geophysical methods; Geophysics; impedance; impedance tensor; Kyrgyz Range; Kyrgyzstan; magnetotelluric methods; MT soundings; seismicity; Seismology; three-dimensional models; thrust; Tien Shan; impedance tensor; Tien Shan; Crust; thrust; electrical conductivity structure; faults; MT soundings
• ISSN: 1068-7971; 1878-030X
• DOI: 10.1016/j.rgg.2007.09.014

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.