Acknowledgments

This project would have been impossible without the Crustal Dynamics Data Information Service at NASA's Goddard Space Flight Center, the Scripps Orbit and Permanent Array Center, and the National Geodetic Survey's CORS data center. All figures were created using the Generic Mapping Tools [Wessel and Smith, 1991]. Finally, thanks are due to my coworkers for their patience as this project spread, like a virus, from computer to computer.