Turkish Journal of Earth SciencesResistivity Distribution in the Gediz Graben and its Implications for Crustal Structure
1 İstanbul University, Engineering Faculty, Department of Geophysics, Avcılar, TR-34850
İstanbul - TURKEY (E-mail: email@example.com)
2 Turkish Petroleum Corporation (TPAO), Mustafa Kemal Mahallesi, 2. Cadde, No. 86,
TR-06520 Ankara - TURKEY
3 University of Kocaeli, Engineering Faculty, Department of Geological Engineering, Vinsan,
TR-41100 Kocaeli - TURKEY
4 Anadolu Yerbilimleri, Perpa Ticaret Merkezi, A Blok, No. 157, Elektrokent, Şişli, İstanbul - TURKEY
Abstract: Preliminary results of resistivity distribution in the crust around the Gediz graben by the magnetotelluric (MT) measurements along two 73- and 16-km-long MT profiles (M1 and profile M2) are presented. Bostick depth transformation of the resistivity component of the MT data denoted a conductive zone at a depth of ~ 10 km. This zone may be related to crustal extension and high regional heat flow (50% higher than the world average). Preliminary interpretation based on one dimensional (1D) inversion result show that the thickness of sediments over the resistive basement changes from 950-3800 m along the profile M1. The relations between the trends of main structures in the region and abrupt lateral resistivity changes in the subsurface within the Gediz graben are discussed in the light of the residual apparent resistivity profiles.
Key Words: Gediz graben, magnetotelluric, resistivity, conductive lower crust
Turkish J. Earth Sci., 11, (2002), 15-25.
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