Abstract The Hasbaya fault is a 50-km-long fault branch of the Dead Sea Transform Fault within the Lebanese Restraining Bend. It lies within the intersection zone of Mount Lebanon and Anti-Lebanon chains, along the western flank of Mount Hermon. It is little studied, its tectonic behavior is unknown, and its role among the other active fault branches of the restraining bend is the least defined. It was mapped as a discontinuous array of fault segments, with minor displacements and tectonically undisturbed basaltic cover. We studied the Hasbaya fault with detailed field mapping, and combining geomorphology, structural geology, and active tectonic investigations. The results reveal little and localized faulting along the entire length of the fault, with no signs of tectonic correlation between the drainage network evolution and the tectonic activity of the fault. The absence of active-tectonic surface features along the Hasbaya fault trend indicates that it does not manifest enough surface evidence to be classified as a tectonically active structure within the Lebanese Restraining Bend, and subsequently does not appear to be a major source of seismic hazard in the region. It may be related to the subsurface structure that controls the monocline that forms the western flank of Mount Hermon, or it may represent the remnant of an old suture zone between Mount Lebanon and Anti-Lebanon as a part of the regional compression imposed across the restraining bend. Our results shed light on the role of the non-active Hasbaya fault in a zone of active faults within a restraining bend, which may provide a case with broader implications on comparable tectonic settings worldwide.

中文翻译：

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活动限制弯曲内的非活动断层：黎巴嫩哈斯巴亚断层的案例

摘要 Hasbaya断层是黎巴嫩限制弯内死海转换断层的一条50公里长的断层支。它位于黎巴嫩山和反黎巴嫩链的交汇区，沿着黑门山的西侧。它很少被研究，它的构造行为是未知的，它在约束弯曲的其他活动断层分支中的作用是最不明确的。它被绘制为不连续的断层段阵列，具有轻微的位移和构造上未受干扰的玄武岩覆盖层。我们通过详细的实地测绘，并结合地貌学、构造地质学和活动构造调查研究了 Hasbaya 断层。结果表明，沿断层的整个长度几乎没有局部断层，排水网络演化与断层构造活动之间没有构造关联的迹象。沿 Hasbaya 断层走向没有活动构造地表特征表明它没有表现出足够的地表证据被归类为黎巴嫩限制弯曲内的构造活动结构，因此似乎不是地震危险的主要来源该区域。它可能与控制形成赫尔蒙山西侧单斜层的地下结构有关，或者它可能代表黎巴嫩山和反黎巴嫩之间旧缝合带的残余物，作为跨限制区施加的区域压缩的一部分弯曲。我们的结果阐明了非活动 Hasbaya 断层在限制弯曲内活动断层带中的作用，