Combined Adjustment of GRACE and Geodetic Observations of Vertical Crustal Motion in the Great Lakes Region
We combine GRACE-derived rates of vertical crustal motion, joint water gauge and satellite altimetry and GPS vertical velocities in the Great Lakes region. The combined vertical motion model is realized via a least-squares adjustment procedure, including variance-component estimation and robust outlier detection. This is necessary to ensure reliable estimates of the relative errors in the least-squares adjustment (via re-scaling of data variance-covariance matrices) and to ensure that the vertical motion model is not distorted by erroneous data. The combined vertical motion model shows a subsidence of 1–2 mm/year along the southern shores and an uplift of 3–4 mm/year along the northern shores generally consistent with the models of postglacial rebound in North America.
KeywordsVertical crustal motion Postglacial rebound GRACE Great lakes Robust least-squares
The authors gratefully acknowledge Dr. W. van der Wal for providing the output of the postglacial rebound model simulations. The anonymous reviewers are acknowledged for their helpful comments. Financial support is provided by the GEOIDE NCE and NSERC to the second author.
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