Abstract. The integration of field geology and high-resolution seismological data allowed us to reconstruct the 3D Fault Model of the sources which gave rise to the 2010–2014 Pollino seismic sequence. The model is constrained at the surface by structural geological data which provide the true attitude of the single faults and their cross-cut relationships. At depth, the fault geometry was obtained using the distributions of selected high-quality relocated hypocenters. Relocations were carried out through a non-linear Bayloc algorithm, followed by the double-difference relative location method HypoDD, applied to a 3D P-wave velocity model. Geological and seismological data converge in describing an asymmetric active extensional fault system characterized by an E to NNE-dipping low-angle detachment, with its high-angle synthetic splays, and SW- to WSW-dipping, high-angle antithetic faults. The cluster of hypocenters and the peculiar time-space evolution of the seismic activity highlight that two sub-parallel WSW-dipping seismogenic sources, namely the Rotonda-Campotenese and Morano-Piano di Ruggio faults activated during the seismic crisis. By applying to the activated structures the appropriate earthquake-scaling relationships, based on fault length and fault area, we infer that the maximum expected magnitudes calculated using the fault area are the more reliable. We estimated M_w = 6.4 for the Rotonda-Campotenese and M_w = 6.2 for the Morano-Piano di Ruggio deducing that both the faults did not release their seismic potential during the 2010–2014 seismic sequence. The size of the activated patches, reconstructed by projecting on the 3D seismogenic fault planes the early aftershocks of the seismicity clusters, are consistent with the observed magnitude of the associate strongest events. Finally, we point out that the western segment of the Pollino Fault, despite not being presently active, acts as a barrier to the southern propagation of the Rotonda-Campotenese and Morano-Piano di Ruggio faults, limiting their dimensions and seismogenic potential.

中文翻译：

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控制 Pollino 地区（意大利南部卡拉布里亚-卢卡尼亚）近期地震活动的结构复杂性和构造障碍——应力反演和 3D 断层模型构建的限制

摘要。现场地质学和高分辨率地震数据的整合使我们能够重建产生 2010-2014 年波利诺地震序列的震源的 3D 断层模型。该模型在地表受到构造地质数据的约束，这些数据提供了单个断层的真实姿态及其横切关系。在深度，断层几何是使用选定的高质量重定位震源的分布获得的。重定位是通过非线性 Bayloc 算法进行的，然后是双差相对定位方法 HypoDD，应用于 3D P 波速度模型。地质和地震数据汇聚在一起描述了一个不对称的活动伸展断层系统，其特征是 E 到 NNE 倾斜的低角度拆离，具有高角度合成张开，和 SW 到 WSW 倾斜的大角度对映断层。震源群和地震活动的特殊时空演化突出了两个次平行 WSW 倾斜的发震源，即 Rotonda-Campotenese 和 Morano-Piano di Ruggio 断层在地震危机期间被激活。根据断层长度和断层面积，通过对激活结构应用适当的地震尺度关系，我们推断使用断层面积计算的最大预期震级更可靠。我们估计 M 根据断层长度和断层面积，通过对激活结构应用适当的地震尺度关系，我们推断使用断层面积计算的最大预期震级更可靠。我们估计 M 根据断层长度和断层面积，通过对激活结构应用适当的地震尺度关系，我们推断使用断层面积计算的最大预期震级更可靠。我们估计 M Rotonda-Campotenese 的_w = 6.4， Morano-Piano di Ruggio 的M _w = 6.2，推断这两个断层在 2010-2014 年地震序列期间都没有释放其地震潜力。通过将地震活动群的早期余震投影到 3D 发震断层面上重建的激活斑块的大小与观察到的相关最强事件的震级一致。最后，我们指出 Pollino 断层的西段，尽管目前不活跃，但却是 Rotonda-Campotenese 和 Morano-Piano di Ruggio 断层向南扩展的障碍，限制了它们的尺寸和地震潜力。