Sediment geotechnical properties are an important component of geohazard analyses and studies on submarine slope failures on continental margins. The northern Cascadia margin is a region of repeated subduction earthquakes and related geohazards including devastating tsunamis. Despite several drilling campaigns at this margin mostly for gas hydrate studies, sediment geotechnical properties are lacking to date. We therefore investigated a set of 20 half-round samples from four drill sites of Integrated Ocean Drilling Program (IODP) Expedition 311 along a margin-perpendicular transect. Samples were analysed for Atterberg properties (liquid limit, plasticity limit, plasticity index) and consolidation state (pre-consolidation stress, over-consolidation ratio, initial void ratio and compression index). Results of these parameters are in good agreement with similar studies at the southern Cascadia margin from Ocean Drilling Program (ODP) Leg 204 and are regarded robust, despite the long time-span between sample recovery in 2005 and our analyses. Individual results are interpreted at each of the drill sites and reflect the overall tectonic state of the location within the accretionary prism. An interplay of site-specific tectonic forcing, including thrust faulting, uplift, folding, and erosion appears to govern the depth-dependent consolidation state of the sediments.

沉积物岩土特性是地质灾害分析和大陆边缘海底斜坡破坏研究的重要组成部分。卡斯卡迪亚北部边缘是一个反复发生俯冲地震和相关地质灾害（包括毁灭性海啸）的地区。尽管在该边缘进行了几次钻探活动，主要用于天然气水合物研究，但迄今为止仍缺乏沉积物岩土特性。因此，我们沿边缘垂直横断面调查了来自综合海洋钻探计划 (IODP) 远征 311 的四个钻探地点的一组 20 个半圆形样品。分析样品的 Atterberg 特性（液限、塑性极限、塑性指数）和固结状态（预固结应力、过固结比、初始空隙率和压缩指数）。这些参数的结果与大洋钻探计划 (ODP) Leg 204 在卡斯卡迪亚南部边缘的类似研究非常一致，并且被认为是稳健的，尽管 2005 年样品回收和我们的分析之间的时间跨度很长。在每个钻探地点解释单独的结果，并反映增生棱柱内位置的整体构造状态。特定地点的构造强迫的相互作用，包括逆冲断层、隆起、褶皱和侵蚀，似乎控制着沉积物与深度相关的固结状态。在每个钻探地点解释单独的结果，并反映增生棱柱内位置的整体构造状态。特定地点的构造强迫的相互作用，包括逆冲断层、隆起、褶皱和侵蚀，似乎控制着沉积物与深度相关的固结状态。在每个钻探地点解释单独的结果，并反映增生棱柱内位置的整体构造状态。特定地点的构造强迫的相互作用，包括逆冲断层、隆起、褶皱和侵蚀，似乎控制着沉积物与深度相关的固结状态。