1. Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853, USA
2. School of Earth Sciences, University of Bristol, BS8 1RJ, United Kingdom
3. College of Earth, Ocean, and Atmospheric Science, Oregon State University, Corvallis, Oregon 97331, USA
4. Department of Geography, Geology and Planning, Missouri State University, 901 S. National Ave, Springfield, Missouri 65897, USA
5. Department of Geosciences, The University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721-0001, USA
6. School of Geosciences, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620, USA
7. Geophysical Institute, University of Alaska, Fairbanks, 903 N. Koyukuk Drive, Fairbanks, Alaska 99709, USA
8. Department of Earth and Planetary Sciences, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA
9. Observatorio San Calixto, Calle Indaburo 944, Casilla 12656, La Paz, Bolivia
10. Empresa Kawsaqi, Correo Central, La Paz, Bolivia
11. Department of Physics, University of Alberta, Edmonton, Alberta T6E 2E1, Canada
12. Institut für Geophysik, Universität Münster, Münster, 48149, Germany
13. Departamento de Geofísica, Universidad de Chile and Centro de Excelencia en Geotermia de Los Andes, Santiago, Chile
14. Department of Earth and Space Sciences, University of Washington, Seattle, Washington 98195-1310, USA
15. 2920 Amberleigh Way, Fairfax, Virginia 22031, USA
16. Instituto de Geofísica, Universidad Nacional Autónoma de México, Av. Universidad 3000, Coyoacán, CP 04510, México DF, Mexico
17. Servicio Nacional de Geología y Minería, Av. Santa María 0104, Santiago, Chile
18. School of Earth and Ocean Sciences, Cardiff University, CF10 3AT, United Kingdom
19. United States Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA
20. Department of Geophysics, Stanford University, 397 Panama Mall, Mitchell Bldg., Stanford, California 94305, USA
21. 1220 SW 3rd Avenue, Suite 1010, Portland, Oregon 97220, USA
22. Department of Geology and Geophysics, The University of Utah, 115 South 1460 East, Salt Lake City, Utah 84112, USA