Journal article
Lidar reveals uniform Alpine fault offsets and bimodal plate boundary rupture behavior, New Zealand
GP De Pascale, MC Quigley, TRH Davies
Geology | Published : 2014
DOI: 10.1130/G35100.1
Abstract
Analysis of light detection and ranging (lidar) derived topography combined with field data enables measurement of small (<30 m), previously unrecognized dextral offsets beneath dense temperate rainforest along New Zealand's central Alpine fault. Field offset measurements often have lower uncertainties than lidar measurements. Offsets of 7.5 ± 1 m for the most recent earthquake (ca. A.D. 1717) and cumulative offsets of 12.9 ± 2 m and 22 ± 2.7 m can be averaged into three 7.1 ± 2.1 m increments of repeated dextral slip at a point, and when combined with an offset compilation show a uniform slip distribution of ̃7.5 ± 2.0 m over 300 km in A.D. 1717. Comparing these offsets with the 1.1 ka pale..
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Funding Acknowledgements
De Pascale was supported by University of Canterbury's Mason Trust & Hari-Hari Field Station, an Education New Zealand International Doctoral Research Scholarship, and a Wellman Research Award by the New Zealand Geoscience Society. Partial funding was from the New Zealand Earthquake Commission. Rob Langridge made major contributions to the lidar collection and discussions. We thank Ursula Cochran, Trevor Hamilton, Mike Oskin, Julie Rowland, and Tim Stahl for comments on this paper. Sinan Akciz and Ozgur Kozaci provided insight into fault behavior. We greatly appreciate reviews by Ramon Arrowsmith, Colin Amos, two anonymous reviewers, and editor James Spotila.