We routinely process selected continuous GPS sites from the Pacific Northwest using the GAMIT/GLOBK analysis software. We process one day in every 5 with GAMIT. Then we compute monthly site positions in the ITRF96 reference frame using GLOBK and including the IGS global solutions from SOPAC. Velocities in the ITRF96 reference frame and their covariances are estimated by a linear regression to the times series of monthly positions. The site velocities are transformed into a North America reference frame by rotating them about the NA-ITRF96 pole determined by DeMets and Dixon (Geophysical Research Letters, 1999; the estimate we get for the NA-ITRF pole is identical to theirs).
Results:
Data are obtained from the Geological Survey of Canada (Western Canada Deformaton Array), the Pacific Northwest Geodetic Array (PANGA), and US Coast Guard CORS sites.
For addtional information, send e-mail to Rob McCaffrey (mccafr@rpi.edu).
