Gerrit Olivier, Institute of Mine Seismology, Die Boord, South Africa, Florent Brenguier, University Joseph Fourier Grenoble, Grenboble, France, Rebecca Carey, University of Tasmania, Centre of Ore Deposits and Earth Sciences, Hobart, Australia, Paul G. Okubo, Hawaiian Volcano Observatory, Hawaii National Park, HI, United States and Clare Donaldson, University of Cambridge, Cambridge, United Kingdom