| Title | Self Potential Surveys of the Mokai and Rotokawa High Temperature Fields (NZ) |
|---|---|
| Authors | M. P. Hochstein, I. Mayhew and R. A. Villarosa |
| Year | 1990 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | |
| Abstract | Self-potential (SP)surveys of the Mokai and Rotokawa geothermal fields (Taupo Volcanic Zone) show the existence of a large km) wavelength positive (200 to 300 SP anomaly that coincides with the extent of the reservoir. At Rotokawa, the anomaly reaches a maximum over the upflow centre in the southern part of the prospect. At Mokai, the anomaly is depressed in level by streaming potentials. These disturbing effects were recognized by expressingthe observed data with respect to a reference potential near the Waikato River, the hydrological sink for all groundwater flowin both prospects. Thermal SP effectscannot be separated from terraininduced streaming potentials. |