We use high-resolution lidar microtopographic data and luminescence dating to constrain incremental Holocene–latest Pleistocene slip rates for the Wairau fault, a major dextral strike-slip fault in the Marlborough Fault System, South Island, New Zealand. Our data come from two closely spaced study areas along the structurally simple, central portion of the fault: The well-known Branch River terrace flight, and a previously undated series of offset risers and channel features several km to the east that we refer to as the Dunbeath site. Field work and mapping using lidar-derived topography yields revised or novel measurements of nine fault offsets. We date those features using a post-IR₅₀-IRSL₂₂₅ infrared stimulated luminescence dating method, and a stratigraphically informed Bayesian age model. The dated slip history of the Wairau fault is further constrained using newly cataloged offset measurements collected along a ∼35 km stretch of the fault, and available paleoseismic data. Incremental slip rates are precisely computed using a Monte Carlo resampling scheme. Our results provide a nearly earthquake-by-earthquake record of incremental slip, with pronounced variations in incremental slip rate spanning multiple millennia and tens of m of slip. These extreme, multi-millennial variations in fault slip rate have basic implications for earthquake occurrence, plate boundary lithosphere behavior, and probabilistic seismic hazard assessment.

中文翻译：

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怀劳断层的最新更新世-全新世增量滑动速率：对新西兰北岛和南岛之间断层的长距离和长期协调的影响

我们使用高分辨率激光雷达微地形数据和发光测年来限制新西兰南岛马尔堡断层系统中主要的右旋走滑断层 Wairau 断层的全新世-最新更新世滑动速率。我们的数据来自沿断层结构简单的中心部分的两个间隔很近的研究区域：著名的 Branch River 阶地飞行，以及以前未注明日期的一系列偏移立管和通道特征，位于东部几公里处，我们将其称为邓比斯网站。使用激光雷达衍生的地形进行实地工作和测绘，可以对九个断层偏移进行修正或新颖的测量。我们使用 post-IR ₅₀ -IRSL ₂₂₅来确定这些特征的日期红外受激发光测年方法和地层学信息贝叶斯年龄模型。使用沿断层约 35 公里范围收集的新编目偏移测量和可用的古地震数据进一步限制了怀劳断层的过时滑动历史。使用蒙特卡罗重采样方案精确计算增量滑移率。我们的结果提供了几乎逐次地震的增量滑动记录，增量滑动率的显着变化跨越了数千年和数十米的滑动。断层滑动率的这些极端的、千禧年的变化对地震发生、板块边界岩石圈行为和概率地震危险性评估具有基本意义。