1. Geology, Minerals, Energy, and Geophysics Science Center, U.S. Geological Survey, Menlo Park, California 94025, USA
2. Earthquake Science Center, U.S. Geological Survey, University of Washington, Seattle, Washington 98195, USA
3. Department of Geology, Humboldt State University, Arcata, California 95521, USA
4. Department of Geology, University of Kansas, Lawrence, Kansas 66045, USA
5. Geoscience and Environmental Change Science Center, U.S. Geological Survey, Denver, Colorado 80225, USA
6. Earth Analysis, Seattle, Washington 98105, USA
7. Global Earthquake Model Foundation, Pavia 27100, Italy