The Porcupine Basin is a large underexplored sedimentary basin located offshore west of Ireland within the structurally complex European North Atlantic Margin. The basin has evolved through multiple Jurassic–Recent phases of deformation and although the overall plate tectonic context of the margin is well-documented, there are still uncertainties regarding the phases of tectonic activity, and their associated strain distribution and fault kinematics. Based on the analysis of large volumes of 2D and 3D seismic data from the Porcupine Basin, we provide an overview of the nature and origin of multiple fault systems, both tectonic and nontectonic, with links to regional tectonic events where possible. Three distinct basin-wide phases of tectonically induced extensional faulting are recognized: (a) Late Jurassic N-S to NE-SW trending rift faults, (b) Late Cretaceous E-W to ENE-WSW trending normal faults and (c) Mid Eocene N-S trending faults. The Jurassic faults were active over a period of 11.5 Myr between the Oxfordian and Kimmeridgian but with an intervening 4.5 Myr period of quiescence providing a two-stage rift evolution. The Late Cretaceous faulting in the Porcupine Basin broadly correlates with extension in the Celtic Sea basins and is tentatively attributed to the rotational spreading of the Bay of Biscay in the south. The Mid Eocene phase of extension, which coincides with the onset of spreading between Europe and Greenland (Atlantic spreading), resulted in partial reactivation of the Jurassic faults. A series of non-tectonic fault systems occur within specific stratigraphic intervals suggesting a compactional or gravitationally driven origin, including basinward dipping normal faults within a Palaeocene–early Eocene deltaic sequence, and multiple tiers of polygonal faults within Cretaceous, late Eocene and Neogene strata.

中文翻译：

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爱尔兰西海岸豪猪盆地的多相变形历史

豪猪盆地是一个大型的未开发的沉积盆地，位于结构复杂的欧洲北大西洋边缘的爱尔兰以西海上。该盆地经历了侏罗纪-最近变形的多个阶段，尽管边缘的整个板块构造背景都有据可查，但在构造活动的各个阶段及其相关的应变分布和断层运动学方面仍存在不确定性。基于对豪猪盆地大量2D和3D地震数据的分析，我们概述了构造和非构造多断层系统的性质和起源，并在可能的情况下与区域构造事件建立了联系。认识到构造诱发性伸展断层的三个不同的盆地范围相：（a）侏罗纪晚期至东北-西南向的裂谷断层，（b）晚白垩世EW到ENE-WSW的正断层，以及（c）中新世NS的断层。侏罗纪断层在牛津和基米底纪之间的活动期为11.5 Myr，但其间的静止期为4.5 Myr，提供了一个两阶段的裂谷演化。豪猪盆地的晚白垩世断层与凯尔特海盆地的扩张广泛相关，并初步归因于南部比斯开湾的旋转扩展。始新世中期伸展，与欧洲和格陵兰之间的扩张开始（大西洋扩张）相吻合，导致了侏罗纪断层的部分活化。在特定的地层间隔内发生了一系列非构造断层系统，表明是压实或重力驱动的成因，