Abstract
We propose that topography can be used as a proxy for the eastward lateral “glacier-like flow” of the Tibetan crust in the Himalayan-Tibetan orogenic system. Geodetic observations across the Tibetan plateau indicate ∼22 mm/yr of crustal motion with respect to stable Eurasia by considering Newtonian channel flow model. Further, correlation between regional strain rate (ė) and topographic elevation (h) is found to be statistically robust, with stress exponent (n) of 3.03 ± 0.1. Therefore, we suggest that the Tibetan crust follows well defined power-law relation that is consistent with the nonlinear deformation associated with dislocation-creep. Moreover, the predicted viscosity range of the Tibetan crust is consistent with the channel flow model proposed by previous investigators using different approaches in different time scales.
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