1. Department of Physics; University of Otago; Dunedin New Zealand
2. National Institute of Water and Atmospheric Research; Wellington New Zealand
3. Department of Physics; University of Auckland; Auckland New Zealand
4. Gateway Antarctica; University of Canterbury; Christchurch New Zealand
5. School of Surveying; University of Otago; Dunedin New Zealand
6. Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
7. Earth & Space Science & Engineering Department; York University; Toronto Ontario Canada
8. Callaghan Innovation; Wellington New Zealand