Keller, G.V. 1969 Electro-magnetic surveys in the Central Volcanic Region: progress report covering work done between 1 Sept. 1968 and 1 Feb. 1969. Report / Geophysics Division 55. 65p.
Abstract: This report describes what has been accomplished to date in attempts to study the thermal area running generally northward from Taupo, New Zealand, using electromagnetic sounding techniques. The work has been carried out within the Geophysics Division of the Department of Scientific and Industrial Research, under the sponsorship of the New Zealand National Research Advisory Council. Previous work, both by DSIR within New Zealand and by other groups at other places, has indicated that the electrical properties of rocks are profoundly affected by geothermal activity, so that electrical properties may serve as a target in exploration for thermal areas. The present work is intended to investigate the electrical properties of rocks deep in the crust beneath the thermal area. The techniques used are based on electromagnetic induction, and resemble standard methods used in mining exploration the world over, with the exception of the scale of application (auth.)