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:: Volume 1, Issue 1 (12-2013) ::
jgit 2013, 1(1): 19-30 Back to browse issues page
3D Finite Element Modelling of Lithospheric Strength in Zagros Mountains
Hamid Reza Nankali *, Behzad Vosooghi, Farhad Sobouti, Khaled Hessami
National Cartographic Center of Iran
Abstract:   (3707 Views)
A three-dimensional lithosphere model with horizontal dimensions of 1500×600 km. and a depth extent of 70 km. is constructed from available geophysical data to find out strength (as the maximum deviatoric stress the lithosphere supports at a given depth) in Arabia-Eurasia plate boundary zone. The constructed model is first used in the calculation of thermal initial condition and then strength envelopes were calculated using the obtained geotherm and rheological flow laws. Numerical models are run for initial temperature distributions representing cold and hot lithospheres with two different rheologies (wet and dry).The obtained mechanical structures were analyzed and compared with other geophysical data e.g., seismicity-depth and isotherm-depth distributions. Model results for wet and dry rheologies indicate that the depth of the brittle-ductile transition is about 8 km., and 11 km. for hot geotherm and 10.5 km. to14 km. and 21-28 for the cold one. The results are in good agreement with focal depth in the Zagros that most earthquakes occur in 8 to 15 km. depth (Tatar et al., 2004 and Jackson et al., 2008) that the long-term strength of the continental lithosphere resided only in its upper part, which was contained wholly within the crust.
Keywords: Rheology, Finite-element methods, Brittle, Geotherm, Iran
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Type of Study: Research |
Received: 2015/02/19 | Accepted: 2015/02/19 | Published: 2015/02/19
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Nankali H R, Vosooghi B, Sobouti F, Hessami K. 3D Finite Element Modelling of Lithospheric Strength in Zagros Mountains. jgit. 2013; 1 (1) :19-30
URL: http://jgit.kntu.ac.ir/article-1-54-en.html

Volume 1, Issue 1 (12-2013) Back to browse issues page
نشریه علمی-پژوهشی مهندسی فناوری اطلاعات مکانی Engineering Journal of Geospatial Information Technology
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