Abstract
In this study, a scheme to estimate oceanic and hydrological effects in the GRACE (Gravity Recovery and Climate Experiment) data is presented. The aim is to reveal tectonic signals for the case of the Sumatra earthquake on 26 December 2004. The variations of hydrological and oceanic effects are estimated with the aid of data set of GRACE, altimetry, World Ocean Atlas, and the GLDAS model for a period of January 2003 to December 2006. The time series of computed gravity changes over Sumatra region show some correlations to the deformation resulting from the earthquake occurred in December 2004. The maximum and minimum impacts of hydrological and oceanic effects on gravity changes are about 3 μGal in radial direction and–5 μGal in northward direction. The maximum and minimum amounts of gravitational gradient changes after the correction are 0.2 and–0.25 mE, which indicates the significant influences of hydrological and oceanic sources on the desired signal.
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Fatolazadeh, F., Voosoghi, B. & Raoofian Naeeni, M. Correction of Hydrological and Oceanic Effects from GRACE Data by Combination of the Steric Sea Level, Altimetry Data and GLDAS Model. Acta Geophys. 64, 1193–1210 (2016). https://doi.org/10.1515/acgeo-2016-0034
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DOI: https://doi.org/10.1515/acgeo-2016-0034
Key words
- hydrological and oceanic effects
- GRACE data
- World Ocean Atlas
- GLDAS model
- gravitational gradient changes