1. 1Incorporated Research Institutions for Seismology, Washington, D.C., U.S.A.
2. 2U.S. Geological Survey, Moffett Field, California, U.S.A.
3. 3Oregon Museum of Science and Industry, Portland, Oregon, U.S.A.
4. 4UNAVCO, Boulder, Colorado, U.S.A.
5. 5Washington Geological Survey, Olympia, Washington, U.S.A.
6. 6Earth Sciences Animated, LLC, Portland, Oregon, U.S.A.
7. 7Independent Contractor, Portland, Oregon, U.S.A.
8. 8California Geological Survey, Sacramento, California, U.S.A.
9. 9U.S. Geological Survey, Pasadena, California, U.S.A.