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Joint modeling of lithosphere and mantle dynamics: Evaluation of constraints from global tomography models

Wang, Xinguo and Holt, William E and Ghosh, Attreyee (2015) Joint modeling of lithosphere and mantle dynamics: Evaluation of constraints from global tomography models. In: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 120 (12). pp. 8633-8655.

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Official URL: http://dx.doi.org/10.1002/2015JB012188


With the advances in technology, seismological theory, and data acquisition, a number of high-resolution seismic tomography models have been published. However, discrepancies between tomography models often arise from different theoretical treatments of seismic wave propagation, different inversion strategies, and different data sets. Using a fixed velocity-to-density scaling and a fixed radial viscosity profile, we compute global mantle flow models associated with the different tomography models and test the impact of these for explaining surface geophysical observations (geoid, dynamic topography, stress, and strain rates). We use the joint modeling of lithosphere and mantle dynamics approach of Ghosh and Holt (2012) to compute the full lithosphere stresses, except that we use HC for the mantle circulation model, which accounts for the primary flow-coupling features associated with density-driven mantle flow. Our results show that the seismic tomography models of S40RTS and SAW642AN provide a better match with surface observables on a global scale than other models tested. Both of these tomography models have important similarities, including upwellings located in Pacific, Eastern Africa, Iceland, and mid-ocean ridges in the Atlantic and Indian Ocean and downwelling flows mainly located beneath the Andes, the Middle East, and central and Southeast Asia.

Item Type: Journal Article
Additional Information: Copy right for this article belongs toAMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
Department/Centre: Division of Mechanical Sciences > Centre for Earth Sciences
Date Deposited: 12 Apr 2016 06:18
Last Modified: 12 Apr 2016 06:18
URI: http://eprints.iisc.ac.in/id/eprint/53659

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