Journal article

Fault kinematics and surface deformation across a releasing bend during the 2010 M-W 7.1 Darfield, New Zealand, earthquake revealed by differential LiDAR and cadastral surveying

Brendan Duffy, Mark Quigley, David JA Barrell, Russ Van Dissen, Timothy Stahl, Sebastien Leprince, Craig McInnes, Eric Bilderback

GEOLOGICAL SOCIETY OF AMERICA BULLETIN | GEOLOGICAL SOC AMER, INC | Published : 2013

Abstract

Dextral slip at the western end of the east-west-striking Greendale fault during the 2010 MW 7.1 Darfi eld earthquake transferred onto a northwest-trending segment, across an apparent transtensional zone, here named the Waterford releasing bend. We used detailed surface mapping, differential analysis of pre- and postearthquake light detection and ranging (LiDAR), and property boundary (cadastral) resurveying to produce high-resolution (centimeter-scale) estimates of coseismic ground-surface displacements across the Waterford releasing bend. Our results indicate that the change in orientation on the Greendale fault incorporates elements of a large-scale releasing bend (from the viewpoint of w..

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Grants

Funding Acknowledgements

This study was funded by the Department of Geological Sciences, University of Canterbury, and by the New Zealand Earthquake Commission (EQC). B. Duffy was supported by a New Zealand Tertiary Education Commission Top Achiever Scholarship. S. Leprince was partly supported by the Keck Institute for Space Studies and by the Gordon and Betty Moore Foundation. We thank J. Beavan for global positioning system survey data, landowners for field access, N. Carson, J. Campbell, S. Hornblow, and A. Mackenzie for field assistance, and Environment Canterbury for LiDAR data. We are grateful to Timothy Little, Paul Mann, John Walsh, James Dolan, and Richard Norris for thoughtful reviews that greatly improved the manuscript.