State of tectonic stress in Shillong Plateau of northeast India |
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| Affiliation: | 1. Geoscience Division, CSIR-North East Institute of Science and Technology, Jorhat, 785006, Assam, India;2. Ministry of Earth Sciences, Govt. of India, New Delhi, India;3. National Research Center for Integrated Natural Disaster Management, Santiago, Chile;4. Indian Institute of Geomagnetism, Navi-Mumbai, 410218, India;5. Institute of Seismological Research, Gandhinagar, 382009, Gujarat, India;1. Department of Forest Biology, Faculty of Forestry, Kasetsart University, Bangkok, 10900, Thailand;2. Center for Advanced Studies in Tropical Natural Resources, Kasetsart University, Bangkok, 10900, Thailand;3. Center of Excellence for Bamboos, Kasetsart University, Bangkok, 10900, Thailand;4. Natural History Museum, National Science Museum, Technopolis, Pathum Thani, 12120, Thailand;1. Wadia Institute of Himalayan Geology, Dehradun, India;2. National Geophysical Research Institute, Hyderabad, India;3. National Center for Earth Sciences Studies, Kerala, India;4. Indian Institute of Technology Kharagpur, Kharagpur, India;1. Key Laboratory of Active Tectonic and Crustal Stability Assessment, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China;2. School of Earth and Space Sciences, Peking University, Beijing, 100871, China;1. Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun, India;2. Department of Geology, Institute of Science, Banaras Hindu University, Varanasi, India;1. Passive Seismology Group, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad-500007, India;2. Academy of Scientific and Innovative Research, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad-500007, India |
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| Abstract: | Tectonic stress regime in the Shillong plateau, northeast region of India, is examined by stress tensor inversion. Some 97 reliable fault plane solutions are used for stress inversion by the Michael and Gauss methods. Although an overall NNW-SSE compressional stress is observed in the area, the stress regime varies from western part to eastern part of the plateau. The eastern part of the plateau is dominated by NNE-SSW compression and the western part by NNW-SSE compression. The NNW-SSE compression in the western part may be due to the tectonic loading induced by the Himalayan orogeny in the north, and the NNE-SSW compression in the eastern part may be attributed to the influence of oblique convergence of the Indian plate beneath the Indo-Burma ranges. Further, Gravitational Potential Energy (GPE) derived stress also indicates a variation from west to east. |
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| Keywords: | Tectonic stress Stress tensor inversion Stress rotation Intra-plate zone Deviatoric stress GPE stress |
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