Located at the southern boundary of the Alpine chain in Morocco, the deformation front of the Southern Rif Mountains is a region of moderate tectonic activity, which makes it a good natural laboratory to understand whether, and how, low compressional strains are located on specific structures. Along the ≈80 km‐long left‐lateral, transpressive and reverse fault zone that runs at the toe of the Pre‐Rif Ridges, an analysis of high‐resolution digital topography provides new geomorphic lines of evidence supporting Quaternary activity along, 20 km‐long fault segments. The fault zone can be divided into the Meknès and the Fès segments, which are constrained at depth by reactivated, NE‐trending basement faults, delimitating paleo‐grabens associated with the Late Triassic‐Jurassic opening of the Atlantic Ocean. For selected sites, we used in situ‐produced ³⁶Cl, ¹⁰Be, and ²⁶Al and high‐resolution topography to infer the timing of abandonment of fluvial markers, which suggest incision rates on the order of 0.6–2 mm/yr. Given their lengths, scaling laws suggest that the identified fault segments should root at about 7–12 km‐depth, possibly reactivating former basement normal faults and making them potential seismogenic sources capable of generating M_w6+ earthquakes, with return times of the order of several hundreds of years. Our new morphochronological data set confirms that the Southern Rif deformation front is a key structure that may have accommodated most of the lateral extrusion of the Rif between the Nubia and Iberia tectonic plates.

中文翻译：

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南部前里夫边界（北部摩洛哥）的地震构造模型：形态年代学的见解

南里夫山脉的变形锋位于摩洛哥高山链的南部边界，是一个构造活动活跃的区域，这使其成为了解特定结构上是否存在低压缩应变以及如何定位低压缩应变的理想自然实验室。 。沿着在前里夫脊前部延伸的约80 km长的左，反压和逆断层带，对高分辨率数字地形的分析提供了新的地貌线，支持沿着20 km-的第四纪活动较长的断层段。断裂带可以分为梅克内斯和费斯两段，它们在深度上受到重新激活的，东北向的基底断裂的限制，从而界定了与大西洋晚三叠世-侏罗纪开放有关的古构造。对于选定的站点，我们使用原位生成的³⁶ Cl，¹⁰ Be和²⁶ Al以及高分辨率地形图可以推断出放弃河流标记的时机，这表明切开速率约为0.6–2 mm /年。考虑到它们的长度，缩放定律建议确定的断层段应在约7-12 km深度处扎根，可能会重新激活以前的地下正断层，使其成为可能产生M _w 6+地震的潜在震源，返回时间约为该数量级。几百年 我们新的形态年代学数据集证实，南部Rif变形锋是一个关键结构，可能已经适应了Nubia和Iberia构造板块之间Rif的大部分横向挤压。