Blick, G.H. 1995 1995 Ostler fault zone GPS survey : field report and comparison with 1870s - 1880s triangulation data . Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 95/25 14 p.
Abstract: GPS observations were made between 25-28 February 1995 at 34 4th order trig stations straddling the central section of the Ostler fault zone in the Mackenzie Basin. Comparison of the GPS results with the 4th order triangulation data, collected during the 1870s-1880s, shows significant shear strain across the Ostler fault zone at a rate of 0.19 ppm/yr relatively contractional at 111 degrees. This rate is similar to those derived through the shear belt of New Zealand and the direction of the axis of contraction, perpendicular to the Ostler fault, is consistent with the reverse nature of the Ostler fault. Detailed studies show that the estimated strain may arise from creep on or near the Ostler fault, the western side of the fault moving in a southeasterly direction (144-149 degrees) relative to the eastern side at a rate of 0.8 – 1.3mm/yr. (auth)