1. U.S. Geological Survey Moffett Field CA USA
2. Invisible Software San Jose CA USA
3. U.S. Geological Survey Menlo Park CA USA
4. Department of Earth and Planetary Sciences University of California, Riverside Riverside CA USA
5. CERI The University of Memphis Memphis TN USA
6. Department of Earth and Planetary Sciences University of California Davis CA USA
7. GNS Science Dunedin New Zealand