The Magallanes–Fagnano Fault is an active strike‐slip structure accommodating the relative displacement between South America and the Scotia Plate. The Chilean portion of the fault is poorly studied because most of it runs below the sea level in the Strait of Magellan. Our tectonic geomorphological study is focused on a rare onshore fault section, along which streams horizontally deflected by hundreds of metres since the last main deglaciation are compatible with a dominant left‐lateral fault kinematics and yield a slip rate of 15.7 ± 2.4 mm/year. This rate is between 2 and 3 times higher than the one estimated on the Argentinian portion of the fault over the same period. This spatial variation may be due to both glacial unloading on the fault zone and/or structural factors. These results point out the need to study strike‐slip faults on several portions to unravel behaviour changes related to internal or external forcing.

中文翻译：

---

火地岛（南巴塔哥尼亚）转换板块边界断层滑动率的沿走向变化

麦哲伦-法尼亚诺断层是一个活跃的走滑构造，适应南美洲和斯科舍板块之间的相对位移。该断层的智利部分研究很少，因为大部分断层位于麦哲伦海峡海平面以下。我们的构造地貌研究集中在罕见的陆上断层部分，自上次主要消冰作用以来，沿该断层部分的溪流水平偏转数百米，与占主导地位的左旋断层运动学相一致，并产生 15.7 ± 2.4 毫米/年的滑移率。这一速率比同一时期阿根廷断层部分的估计速率高出 2 至 3 倍。这种空间变化可能是由于断层带上的冰川卸载和/或结构因素造成的。这些结果指出需要研究几个部分的走滑断层，以揭示与内部或外部强迫相关的行为变化。