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Deformation monitoring of the ostler fault zone, South Island, New Zealand.pdf

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Deformation monitoring of the ostler fault zone, South Island, New Zealand

Tectonophysics, 167 (1989) 329-339 Elsevier Science Publishers B.V., Amsterdam - Printed in The Netherlands 329 Deformation monitoring of the Ostler Fault Zone, South Island, New Zealand G.H. BLICK ‘, S.A.L. READ ’ and P.T. HALL 2 ’ New Zealand Geological Survey, P.O. Box 30368, Lower Hutt (New Zealand) ’ Ministry of Works and Development, P.O. Box 504, Timaru (New Zealand) (Received September 30.1987; revised version accepted May 19,1988) Abstract Blick, G.H., Read, S.A.L. and Hall, P.T., 1989. Deformation monitoring of the Ostler Fault Zone. South Island, New Zealand. In: M.J. Berry (Editor), Earthquake Hazard Assessment and Prediction. Tectonophysics, 167: 329-333. The Ostler Fault Zone is a zone of Quaternary reverse faulting along the western margin of the Mackenzie Basin, South Island, New Zealand. During investigations for and construction of the Ohau-A Power Project, a number of survey patterns were designed and installed to monitor ground deformation in the area of the fault zont:. A triangulation network, two long and two short levelling routes, and six tilt levelling patterns have been installed at various times since 1964. Analysis of the levelling data shows that vertical deformation has occurred within the ‘ault zone at a near constant rate for the last 20 years. Deformation consists of buckling about fault traces at a maxinum rate of uplift of approximately 1 mm/yr. The vertical deformation preserved over 16,000-25,000 yrs has a similar rate although it is dominated by displacement across the fault zone as a whole. Analysis of triangulation data spannin; up to 100 years indicates that significant horizontal strain is occurring, with the axis of relative contraction approximately perpendicular to the trend of the fault. Introduction The Ostler Fault Zone is a zone of Quaternary reverse faulting along the western margin of the Mackenzie Basin, South Island, New Zealand (Fig. 1). Part of the Upper Waitaki Power Development Sche