1. Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA
2. Department of Geoscience University of Wisconsin‐Madison Madison WI USA
3. Scripps Institution of Oceanography University of California, San Diego La Jolla CA USA
4. Nevada Geodetic Laboratory, Nevada Bureau of Mines and Geology University of Nevada, Reno Reno NV USA
5. Canadian Geodetic Survey National Resources Canada Ottawa Ontario Canada
6. Department of Geosciences University of Montana Missoula MT USA