1. 1NORSAR, Kjeller, Norway
2. 2Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan, U.S.A.
3. 3EarthScope, Washington D.C., U.S.A.
4. 4Institute of Earth Sciences, Academia Sinica, Nangang, Taipei, Taiwan
5. 5Research School of Earth Sciences, Australian National University, Acton, ACT, Australia
6. 6AP Sensing GmbH, Boeblingen, Germany
7. 7Institute of Geophysics, ETH Zürich, Zürich, Switzerland
8. 8Swiss Seismological Service, ETH Zürich, Zürich, Switzerland
9. 9FEBUS Optics, Pau, France
10. 10Helmholtz Centre Potsdam, German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany
11. 11Institute of Marine Sciences—CSIC, Passeig Maretim de la Barceloneta, Barcelona, Spain
12. 12Instituto Geográfico Nacional (IGN), Calle del Gral. Ibáñez de Ibero, Madrid, Spain
13. 13Istituto Nazionale di Geofisica e Vulcanologia—Osservatorio Etneo, Catania, Italy
14. 14JAMSTEC, Yokosuka, Kanagawa, Japan
15. 15School of Earth and Environment, University of Leeds, Leeds, United Kingdom
16. 16Department of Earth and Environmental Sciences, LMU Munich, Munich, Germany
17. 17Nagra, Wettingen, Switzerland
18. 18Nanjing University, Nanjing, China
19. 19Norwegian University of Science and Technology, Trondheim, Norway
20. 20Department of Earth, Environmental, and Planetary Sciences, Rice University, Houston, Texas, U.S.A.
21. 21Sandia National Laboratories, Albuquerque, New Mexico, U.S.A.
22. 22Silixa LLC, Missoula, Montana, U.S.A.
23. 23Sintela Ltd, The Distillery, The Old Brewery Office Park, Bristol, United Kingdom
24. 24Department of Geophysics, Stanford University, Stanford, California, U.S.A.
25. 25Southern University of Science and Technology, Shenzhen, Guangdong, China
26. 26T8 Sensor, LLC, Moscow, Russia
27. 27ASN Norway AS, Tiller, Norway
28. 28Graz University of Technology, Graz, Austria
29. 29Department of Geoscience, University of Wisconsin-Madison, Madison, Wisconsin, U.S.A.