1. Albuquerque Seismological Laboratory U.S. Geological Survey Albuquerque NM USA
2. Department of Geosciences Warner College of Natural Resources Colorado State University Fort Collins CO USA
3. Department of Geosciences The Pennsylvania State University University Park PA USA
4. Roy M. Huffington Department of Earth Sciences Southern Methodist University Dallas TX USA
5. National Earthquake Information Center U.S. Geological Survey Denver CO USA
6. Scripps Institution of Oceanography University of California, San Diego La Jolla CA USA
7. Incorporated Research Institutions for Seismology Consortium Washington DC USA
8. Lamont Doherty Earth Observatory Columbia University Palisades NY USA
9. Department of Earth Sciences Royal Holloway University of London Egham UK
10. Department of Earth Sciences University of Oxford Oxford UK
11. Department of Earth and Planetary Science University of California, Berkeley Berkeley CA USA
12. Department of Geology University of Maryland, College Park College Park MD USA
13. Institut de Physique du Globe de Paris Université Paris Cité CNRS Paris France