关键词: 大地电磁测深, 视电阻率, 新疆, 二维反演, 电性结构

Abstract: Magnetotelluric data have recently been obtained at 35 sites along a profile of about 93km long and orientated approximately N-S in the Manas earthquake area which lies in northern Tianshan mountains of Xinjiang Autonomous region From these data the apparent resistivities,impedance phases,skewnesses,optimal rotation angles and induction vectors were calculated and analysed The 2-D inversion method RRI was used for the data interpretation The results show that the shallow crust can be divided into 5 sections and the deeper crust into 3 sections according the electric structure The boundaries of different sections are coincidence with faults The maximum sediment basement is about 12 km deep The resistivity distribution near the Manas earthquake focal area is significantly heterogeneous

Key words: Magnetotelluzic Sounding, Apparent resistivity, Xinjiang, 2-D inversion, electrical structure