Abstract Discrepancies in earthquake characteristics between geodetically determined and geologically observed slip rates are prominent for the eastern part of the North Anatolian Fault (NAF) zone. We investigated the spatial distribution of deformation across a NAF fault segment near Erzincan, NE Turkey, through field observations of physiographic features along the principle fault and a carbonate-filled fissure system. We propose that distributed deformation across the principal fault in a stretching zone caused sigmoidal simple-shear rotation of the carbonate-filled fissure system. Displacement data of that sigmoidal fissure using isotopic age results of the carbonate fill indicates an off-fault deformation rate of 15.90 ± 3.19 mm per year for the Holocene, which corresponds to at least 50% of the geodetically estimated annual slip across the fault. It is critical to take the distributed deformation into account for determining earthquake characteristics of active fault systems.

中文翻译：

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北安纳托利亚断裂带的断层变形及碳酸盐岩脉滑移速率评估

摘要 在北安纳托利亚断层 (NAF) 带东部，大地测量确定的和地质观察到的滑动率之间的地震特征差异很突出。我们通过沿主要断层和碳酸盐岩填充裂隙系统的地貌特征实地观察，研究了土耳其东北部埃尔津坎附近 NAF 断层段的变形空间分布。我们提出，伸展带中主要断层的分布变形导致碳酸盐填充裂隙系统的 S 形简单剪切旋转。使用碳酸盐填充物同位素年龄结果的 S 形裂隙位移数据表明全新世的断层变形率为 15.90 ± 3.19 毫米/年，这对应于至少 50% 的大地测量估计的跨断层年度滑移。考虑分布变形对确定活动断层系统的地震特征至关重要。