Details of the Abstract
| Title of paper | Lithospheric Dynamics and Electrical Anisotropy: Magnetotelluric Analysis in Southern Tibetan Plateau |
| List of authors | Zhehan Liu, Sheng Jin, Hao Dong, Wenbo Wei, Gaofeng Ye, Letian Zhang |
| Affiliation(s) | School of Geophysics and Information Technology, China University of Geosciences, Beijing, China, School of Geophysics and Information Technology, China University of Geosciences, Beijing, China, School of Geophysics and Information Technology, China University of Geosciences, Beijing, China, School of Geophysics and Information Technology, China University of Geosciences, Beijing, China, School of Geophysics and Information Technology, China University of Geosciences, Beijing, China |
| Summary | The mechanisms driving stress-induced surface deformation in the Tibetan Plateau have been a topic of debate. This study utilizes magnetotelluric data to develop two-dimensional anisotropic electrical resistivity models of the crust and upper mantle along a profile in the southern Tibetan Plateau. Our models reveal extensive crustal conductive structures with two groups of distinct anisotropic electrical properties, i.e.: 1) near north-south oriented anisotropy in the middle crust, and 2) east-west oriented anisotropy in the lower crust. These observations align with the dominate N-S stress distribution of the Tibetan Plateau. The distinct anisotropic alignment may reflect the variations in deformation styles and rheology: brittle in the upper crust, semi-brittle in the middle crust, and viscous in the lower crust. The N-S directed anisotropy correlates with the N-S aligned fractures or microcracks filled with fluids in the near-brittle upper and middle crust, while the E-W aligned viscous melt pockets may explain the observed E-W anisotropic characteristics in the lower crust. |
| Session Keyword | 7.0 Electrical rock properties: computer, laboratory and field experiments, including anisotropy |
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