Deformation of convergent plates: Evidence from discrepancies between GPS velocities and rigid-plate motions

Physics

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Tectonophysics: Continental Contractional Orogenic Belts, Tectonophysics: Plate Motions-Present And Recent (3040)

Scientific paper

Systematic discrepancies between the Global Positioning System (GPS) site velocities and those predicted by plate-motion models across the Andes, the Himalayan-Tibetan plateau, and the Taiwan orogen delineate diffuse plate-boundary deformation and significant intraplate deformation, even in the presumably rigid oceanic plates. The relationship between the GPS velocities and the predictions of plate-motion models is illustrated using a simple timescale-dependent mechanical model of plate convergence. A simple stiffness number (φ), based on the difference between the predictions of plate-motion models and the GPS velocity near plate boundaries, provides a convenient measure of the ``plate-like'' behavior of convergent plates and strain partitioning between intraplate and interplate deformation.

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