| Abstract |
AMT/MT soundings at 11 sites on a southnorth line across Broadlands-Ohaaki geothermal field clearly detect the upper surface of the geothermal reservoir. Depth to the reservoir varies from l00m to around 450m. The low resistivity region associated with the reservoir appears to extend well to the south of the field at a depth of about lkm. In contrast, the northern boundary of the field is relatively abrupt. There is evidence of a second conducting region, possibly marking the base of the crust, at a depth of 15-20km. |