Michael P Poland, USGS Cascades Volcano Observatory, Vancouver, WA, United States, Elske de Zeeuw - van Dalfsen, Royal Netherlands Meteorological Institute, De Bilt, Netherlands, Marco Bagnardi, Goddard Space Flight Center, Greenbelt, MD, United States, Ingrid A Johanson, Univ California Berkeley, Seismological Laboratory, Berkeley, CA, United States and Ashton F Flinders, USGS - HVO, Hilo, HI, United States