[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