Stefano Mannini, Affiliation Not Listed, DC, United States, Joël Ruch, University of Geneva, Geneva, Switzerland, James Hollingsworth, ISTerre Institute of Earth Sciences, Saint Martin d'Hères, France, Donald A Swanson, USGS, Hawaiian Volcano Observatory, Hawaii Volcanoes National Park, HI, United States and Ingrid A Johanson, Univ California Berkeley, Seismological Laboratory, Berkeley, CA, United States