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  • Raster files and contours of apparent resistivity collected at nominal electrode array spacings of 500 and 1000 m. DC resistivity mapping data collected by GNS Science and its predecessor organisations from the mid-1960s until 1997, primarily for geothermal exploration. Apparent resistivity varies by several orders of magnitude in the Taupō Volcanic Zone, where there is a significant resistivity contrast between rocks saturated with hot geothermal fluids and cold, siliceous volcanic rocks. Over 32,000 DC resistivity mapping observations have been made in New Zealand. The greatest number of measurements are in the Taupō Volcanic Zone, with some smaller surveys in the Waihi area and Ngawha in Northland. All data collected since 1970 have been with the Schlumberger electrode configurations with nominal electrode spacings of AB/2 = 500m and AB/2 = 1000m. Prior to 1970, DC resistivity data were mostly collected using a Wenner array with electrode spacing 1800 ft (549 m) and 3600 ft (1097 m). Data collected in Lake Taupō used two 150 m long dipoles towed behind small boats, each boat separated by 500 m forming an equatorial dipole-dipole array. For more information on the data collection see download resource (below), Bibby 1988, Bennie et al. 1995, Caldwell and Bibby 1992. Rasters and contours can be accessed via the E Tūhura - Explore Zealandia (TEZ) portal ( DOI for this data set is Bennie, S. L., Stagpoole, V. M. and Bibby, H. M., 1985. Waterborne resistivity measurements in the Rotorua Lakes area of New Zealand. Geophysics Division Report 206, DSIR, Wellington. Bibby HM, 1988. Electrical resistivity mapping in the Central Volcanic Region of New Zealand. New Zealand Journal of Geology and Geophysics, Vol. 31: 259-274. Caldwell, T. G. and Bibby, H. M. 1992. Geothermal implications of resistivity mapping on Lake Taupō. Proc. 14th N. Z. Geothermal Workshop 1992, pp. 207-212, University of Auckland.