[1] GNS Sci, Lower Hutt, New Zealand
[2] Univ Leeds, Sch Earth & Environm, Ctr Observat & Modelling Earthquakes Volcanoe & T, Leeds, W Yorkshire, England
[3] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
[4] Univ Texas Austin, Inst Geophys, Austin, TX 78758 USA
[5] Univ Otago, Sch Surveying, Dunedin, New Zealand
[6] Land Informat New Zealand, Wellington, New Zealand
[7] Natl Inst Water & Atmospher Res, Wellington, New Zealand
[8] Victoria Univ Wellington, Sch Geog Environm & Earth Sci, Wellington, New Zealand
[9] Univ Canterbury, Dept Geol Sci, Christchurch, New Zealand
[10] Univ Auckland, Sch Environm, Auckland, New Zealand
[11] Univ Otago, Dept Geol, Dunedin, New Zealand