Gert Lube, Massey University, School of Environment and Agriculture, Palmeston North, New Zealand, Ermanno Brosch, Massey University, School of Environment and Agriculture, Palmerston North, New Zealand, Eric Breard, University of Oregon, Department of Earth Sciences, Eugene, OR, United States, Matteo Cerminara, Istituto Nazionale di Geofisica e Vulcanolgia, Sezione Pisa, Pisa, Italy, Tomaso Esposti Ongaro, Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Pisa, Pisa, Italy and Jim Jones, Massey University, School of Engineering and Advanced Technology, Palmerston North, New Zealand