Understanding deformation associated with active thrust wedges is essential to evaluate seismic hazards. In this study, we investigate the spatial distribution, timing, and rates of deformation across the central Andean backarc of Argentina, where deformation and shortening have been assumed to occur within a narrow wedge‐front zone. The combined results of our geomorphic mapping, topographic surveying, and ¹⁰Be exposure dating demonstrate that fault activity related to the growth of the Andean orogenic wedge is not only limited to a narrow thrust front zone but also occurs in the Andean wedge interior. There, internal structures with deformation rates of ca. 1.3 mm/year have been active during the last ~140 ka. Widely distributed deformation implies that seismic hazards may have been underestimated in the internal part of the Andean orogen.

中文翻译：

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10Be表面暴露测年显示出安第斯楔形中央内部的意外高变形率

了解与活动推力楔相关的变形对于评估地震危害至关重要。在这项研究中，我们调查了整个阿根廷中部安第斯后弧的空间分布，时间和变形速率，假定变形和缩短发生在狭窄的楔形前缘区域。我们的地貌测绘，地形勘测和^10个综合结果暴露测年表明，与安第斯造山楔生长有关的断层活动不仅限于狭窄的逆冲锋区，而且还发生在安第斯楔内。在那里，内部结构的变形率约为。在最近的〜140 ka期间，每年活动1.3 mm。广泛分布的变形意味着安第斯造山带内部的地震危险可能被低估了。