Abstract The geometry, rates and kinematics of active faulting in the region close to the tip of a major crustal-scale normal fault in the Gulf of Corinth, Greece, are investigated using detailed fault mapping and new absolute dating. Fault offsets have been dated using a combination of 234U/230Th coral dates and in situ 36Cl cosmogenic exposure ages for sediments and wave-cut platforms deformed by the faults. Our results show that deformation in the tip zone is distributed across as many as eight faults arranged within ~700 m across strike, each of which deforms deposits and landforms associated with the 125 ka marine terrace of Marine Isotope Stage 5e. Summed throw-rates across strike achieve values as high as 0.3–1.6 mm/yr, values that are comparable to those at the centre of the crustal-scale fault (2–3 mm/yr from Holocene palaeoseismology and 3–4 mm/yr from GPS geodesy). The relatively high deformation rate and distributed deformation in the tip zone are discussed in terms of stress enhancement from rupture of neighbouring crustal-scale faults and in terms of how this should be considered during fault-based seismic hazard assessment.

中文翻译：

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科林斯湾南 Alkyonides 断层系统尖端带分布的正断层，使用晚第四纪波切平台的 36Cl 暴露测年约束

摘要 使用详细的断层图和新的绝对定年法研究了靠近希腊科林斯湾主要地壳尺度正断层尖端区域的活动断层的几何形状、速率和运动学。断层偏移已使用 234U/230Th 珊瑚日期和原位 36Cl 宇宙成因暴露年龄的组合对沉积物和因断层变形的波浪切割平台进行了测年。我们的结果表明，尖端区的变形分布在多达 8 个断层中，这些断层排列在跨走向约 700 m 内，每个断层都会使与海洋同位素第 5e 阶段的 125 ka 海洋阶地相关的沉积物和地貌变形。总投掷率达到高达 0.3-1.6 毫米/年的值，值与地壳尺度断层中心的值相当（全新世古地震学为 2-3 毫米/年，GPS 大地测量学为 3-4 毫米/年）。从邻近地壳尺度断层破裂引起的应力增强以及在基于断层的地震危险性评估中应如何考虑这一点，讨论了尖端带中相对较高的变形率和分布变形。