Mechanical strain gauge measurements at Te Marau
In 1981 an array of five steel rods linking four monument was installed across the trace of the Wellington Fault, at the site of the Te Marau water storage project. This array was instrumented with electronic displacement transducers and data loggers to serve as a horizontal strainmeter. Corresponding measurements have been made from time to time using a Whittemore mechanical strain gauge. Though these measurements are consistent with a model of right lateral shear deformation at an average rate of (5 ± 2) x 10-6 /yr (engineering units) since 1982, some or all of this estimate may be due to flexure of the rods; it may therefore be considered as an upper limit to deformation at the site. Verification by precise surveying methods may be possible if there is a sufficiently broad zone of deformation.
Berryman, K.R. in prep: Late Quaternary Tectonic Map of Upper Hutt, 1:25 000. DSIR, Wellington, New Zealand.
Brown, I.R. and Wood, P.R. 1983: Strain Measurements Across the Wellington Fault at Te Marua. Proc. Third South Pacific Regional Conf. on Earthquake Engineering, Wellington, New Zealand. The N.Z. National Society for Earthquake Engineering, Vol. 3, pp.509-518.
Lensen, G.J. 1958: The Wellington Fault from Cook Strain to Manawatu Gorge. N.Z. Journal of Geology and Geophysics, Vol. 1, pp.178-196.
Copyright (c) 1986 D. J. Darby, N. D. Perrin
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