Constraints on Intra-Continental Strain Rates and Glacial Isostatic Adjustment from Thousands of GPS Velocities
July 6, 2017 • 485 Views
Workshop 2017 - Corné Kreemer - Here, we use >2,200 GPS velocities within intraplate North America and apply a new technique to robustly measure the horizontal strain rate field and the associated intraplate velocity field. The results are clearly due to GIA, but the analysis of the differences between observations and predictions of this field generated by the ICE-6G_C (VM5a) model and the latest ICE-7G_NA (VM7) model may provide interesting insight on the GIA process. This is especially important in light of the recent availability of high-quality constraining data from the forebulge region used in the generation of the latest ICE-7G_NA (VM7) model. At the same time, our results for the net-rotation of North America are robust and independent of an arbitrary choice of reference stations.