Learn to be still: Accounting for the hydrologic contributions to GPS displacements in the continental United States

Susheel Adusumilli, Adrian A. Borsa, Francesca Silverii, & Duncan C. Agnew

Published August 15, 2017, SCEC Contribution #7824, 2017 SCEC Annual Meeting Poster #214

Using the decade-long record of continuous GPS observations, we estimate mass fluxes across the contiguous United States by inverting station displacements for terrestrial water storage anomalies. We further improve this estimate by jointly inverting the GPS displacements with satellite gravity measurements from the GRACE mission. This yields a new high-resolution terrestrial water storage data product whose lowest resolution is equivalent to that of direct estimates from the GRACE mission. We use the derived hydrological changes to infer the seasonal and long-term contributions of changes in water storage in the observed GPS displacements. We show that hydrological changes contribute significantly to the vertical displacements and should be accounted for in studies of three-dimensional crustal changes.

Citation
Adusumilli, S., Borsa, A. A., Silverii, F., & Agnew, D. C. (2017, 08). Learn to be still: Accounting for the hydrologic contributions to GPS displacements in the continental United States. Poster Presentation at 2017 SCEC Annual Meeting.

Related Projects & Working Groups
Stress and Deformation Over Time (SDOT)