Science Applications of GPS: Deep Earth Dynamics | UNAVCO Facility

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Project Support Science Applications of GPS Active Tectonics Crustal Deformation Educational Outreach Intraplate Deformation Deep Earth Dynamics Plate Rigidity Polar Studies and Glaciology Plate Boundary Zone Tectonic Geomorphology Volcano Studies Volcano Monitoring		Science Applications of GPS: Deep Earth Dynamics On this page Scientific Introduction from UNAVCO Brochure Sample Budget and Vendor List Deep Earth Dynamics GPS data, though taken at Earth's surface, can give important insight into deep Earth dynamics. For example, GPS data from the Yellowstone area, one of the world's largest volcanic systems, are being integrated with seismological and other data to provide important new insight into the interaction between the mantle plume and continental lithosphere (28). Figure 13 - Three-dimensional site velocities of the Yellowstone caldera estimated from GPS surveys. The results show subsidence of up to 17 mm/yr accompanied by approximately 5 mm/yr contraction across the caldera. The period shown (1987-1995) followed a 50-year period of uplift. Most recent results suggest a return to uplift, illustrating the complex time-dependant deformation. GPS measurements of motions from postglacial rebound in North America and Fennoscandia should provide important information about mantle rheology. Figure 14 - GPS and tide gauge measurements of vertical uplift rates along the U.S. East coast can be used to constrain models of mantle viscosity, by comparing data to the predicted uplift rates for different mantle models. (Figure by T. van Dam and M. Schenewerk.) Back to top Last modified Monday, 26-Nov-2007 23:11:58 UTC

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