The tectonic stress field and deformation pattern of northeast India,the Bengal basin and the Indo-Burma Ranges: A numerical approach |
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| Authors: | Md Shofiqul Islam Ryuichi Shinjo JR Kayal |
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| Institution: | 1. Faculty of science, University of the Ryukyus, Nishihara-cho, Okinawa 903-0213, Japan;2. Department of Petroleum and Georesources Engineering, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh;3. School of Oceanographic Studies, Jadavpur University, Kolkata 700 032, India;1. Birbal Sahni Institute of Palaeobotany, Quaternary Palynology Division, 53 University Road, Lucknow 226007, Uttar Pradesh, India;2. Balpakram National Park, South Garo Hills, Meghalaya, India;3. Mahadeo Wildlife Range, South Garo Hills, Meghalaya, India;1. American International Group (AIG), CoE Analytics, Portfolio Modeling, Global Property, 5th Floor, Crescent 4, Whitefield, Bangalore 560048, India;2. Risk Modeling and Insurance Division, RMSI Private Limited, Sector-16, Noida 201301, India;3. Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India;1. Institute of Applied Geophysics, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 202, Taiwan;2. 44 rue du Cloître, 29280 Plouzané, France;3. Ifremer Centre de Brest, BP 70, 29280 Plouzané Cedex, France;4. Department of Earth Sciences, National Central University, Chung-Li 32001, Taiwan;5. Laboratoire GEOAZUR, UMR 7329 CNRS, 250 rue Albert Einstein, Sophia-Antipolis, 06560 Valbonne, France;1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jialuo Road 2019, Jiading District, Shanghai 201800, China;2. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Zhangheng Road 239, Pudong District, Shanghai 201204, China;1. Department of Earth-Sciences, IIT Roorkee, Roorkee 247667, India;2. Wadia Institute of Himalayan Geology, General Mahadeo Singh Road, Dehradun 248001, India;3. National Center for Seismology, Satmet Building, India Meteorological Department Complex, Lodi Road, New Delhi 110003, India |
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| Abstract: | We performed numerical simulations to determine the contemporary maximum horizontal compressive stress (σHmax) in the northeast India region, the Bengal basin (Bangladesh), and the adjoining Indo-Burma Ranges, with different boundary conditions. The regional tectonic stress was simulated using the finite element method (FEM) under the plane stress condition. Most of the study areas show NE–SW regional stress orientation, which is consistent with other stress indicators, such as earthquake focal mechanism solutions. The E–W trending Dauki fault, which separates the Shillong plateau to the north from the Bengal basin to the south, plays a major role in the stress distribution and regional deformation. This fault alone accommodates ～25% of the regional surface displacement rate of the study area. The fault pattern of the study area was also simulated using rheological parameters and the Mohr–Coulomb failure criterion. The simulated results reproduce the observed tectonic state of the area, including a strike-slip regime along the Dauki fault, in the southwestern part of the Bengal basin, and in the Tripura fold belt areas. The modeling indicates that the Brahmaputra valley to the north of the Shillong plateau and to the south of the Himalayan frontal thrust exhibits thrust/reverse faulting with a strike-slip component, and in the Indo-Burma Ranges, strike-slip faulting is predominant with a reverse fault component. |
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