Map depicting the vertical GPS site motions with respect to IGb00 (a reference plane) as estimated by Sella et al. (2007).
Sella, G.F., Stein, S., Dixon, T.H., Craymer, M., James, T.S., Mazzotti, S. and R.K. Dokka. 2007. Observation of glacial isostatic adjustment in ‘‘stable’’ North America with GPS. Geophysical Research Letters, v. 34.