Figure 1. Study site location. (1) The Taupo Volcanic Zone and associated geothermal fields in the central North Island, New Zealand. Modified from Bibby et al. (1995) and Wilson et al. (1995). (2) Map of the Rotokawa Geothermal Field and location of the study site. Modified from Collar and Browne (1985), Krupp and Seward (1987) and Reyes et al. (2002).