1. Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA
2. Institute of Geophysics Department of Earth Sciences ETH Zurich Zurich Switzerland
3. Virginia Tech Blacksburg VA USA
4. University of California Berkeley CA USA
5. Department of Earth Sciences Durham University Durham UK
6. USGS, Hawaiian Volcano Observatory Hilo HI USA
7. Université de Paris, Institut de physique du globe de Paris, CNRS Paris France
8. USGS, Alaska Volcano Observatory Fairbanks AK USA
9. ENS de Lyon Lyon France