Detailed analysis of Greendale Fault ground surface rupture displacements and geometrics

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Litchfield, N.J.; Van Dissen, R.J.; Hornblow, S.; Quigley, M.; Archibald, G.C. 2014 Detailed analysis of Greendale Fault ground surface rupture displacements and geometrics. Lower Hutt, N.Z.: GNS Science. GNS Science report 2013/18 165 p.

Abstract: The 4 September 2010 rupture of the Greendale Fault during the Darfield earthquake is by far the best documented ground surface rupture in New Zealand and one of the best documented in the world. As such it provides an important opportunity to describe the displacement distribution and geometry of an active fault resulting from a single coseismic rupture, which can in turn be used to improve our understanding of fault behaviour during earthquakes and to constrain better single event displacement for fault displacement and seismic hazard studies. Prior to this study, Greendale Fault surface rupture displacement and geometry had been characterised using selected datasets, but some datasets had not been used at all and others not in any detail. In this study we make use of multiple datasets to: 1. Compare Greendale Fault dextral ground surface displacement measurements using different datasets and by different geologists; and 2. Characterise the width and distribution of across-fault (perpendicular to fault strike) ground surface displacement. This report also presents a more detailed description and some further analysis of the previously published displacement measurements and a re-survey of selected markers to test for post-seismic displacement approximately 2.5 years after the Darfield earthquake. (auth)