Gravity inversion in Qinghai-Tibet Plateau |
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| Institution: | 1. State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;3. Institute of Earth Sciences, Academia Sinica, Taipei 11529, China;4. Department of Geosciences, National Taiwan University, Taipei 10617, China;5. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;6. Department of Earth Sciences, Durham University, Durham DH1 3LE, UK;1. Czech Geological Survey, Klárov 3, 118 21 Prague 1, Czech Republic;2. Institute of Petrology and Structural Geology, Faculty of Science, Charles University, Albertov 6, 128 43 Prague 2, Czech Republic;3. Institute of Geology of the CAS, v. v. i., Rozvojová 269, 165 00 Prague 6, Czech Republic;4. Plagioclase LLC, 16th khoroo-19, Bayanzurkh district, Ulaanbaatar, Mongolia |
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| Abstract: | Due to its high elevation and high seismicity the Qinghai-Tibet plateau takes a primary position on the earth surface. The inaccessibility of the region makes geophysical studies difficult. Active seismic sounding is available along essentially one line crossing the eastern part of the plateau. In such a situation gravity is a powerful method to obtain information on the crustal structure. We apply an inversion of the gravity field throughout the entire plateau. The inversion is limited to the long-wavelength band of the field, which has been shown by spectral analysis to be generated at lower crustal levels. The field is inverted in terms of the oscillation of a boundary layer with strong density contrast. This boundary is identified with the crust-mantle discontinuity (Moho). A map of the 3D oscillations of the Moho is presented and the properties discussed along 4 profiles cutting the plateau longitudinally and transversally. |
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