- Related Research Areas
- Earth Surface & Interior
One of the great achievements of the GRACE mission is that the dynamic mass changes occurring in the ocean are now being monitored globally each month. One of the
spin-offs of these new solutions is that contemporary, state-of-the-art, ocean models are now validated with respect to their mass-bearing dynamics. This implies that, with both quantifiable accuracy and error budgets now in hand, we can predict a full spectrum of elastic-gravitational interactions with the solid Earth, from its surface to the core-mantle boundary. Such a spectrum includes all elastic-gravitational stresses, stress-rates, displacements, perturbed gravitational fields, etc. We plan to compute these fields and compare them to global geodetic data networks, patterns in seismicity and terrestrial gravimetry data. The main product of this work is to generate new mapping information, about ocean load-induced strain, stress and stress-rate in the crust and lithosphere everywhere across the globe. Although we cannot predict with certainty that strong correlations with seismicity will be discovered, this mapping will provide, for the first time, a basic information set that serves both the geodetic and seismological communities. Advanced studies that could follow include improved strategies for extracting geophysical information from the new International Terrestrial Reference Frame (ITRF). We plan to examine southern hemispheric GPS station data that have sensitivity to the Antarctic Circumpolar Current and other areas where mass-bearing dynamics is especially strong.
Project PI: Erik Ivins/Jet Propulsion Lab./Caltech
Jet Propulsion Laboratory M/S 300-233 4800 Oak Grove Drive Pasadena, CA 91109
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