Newly identified active faults in the Pollino seismic gap, southern Italy, and their seismotectonic significance
Newly identified active faults in the Pollino seismic gap, southern Italy, and their seismotectonic significance
复制标题
DOI：
10.1016/j.jsg.2016.10.005
复制
发表时间：
2017-01-01
影响因子：
3.1
通讯作者：
Totaro, Cristina
中科院分区：
文献类型：
--
作者：
Brozzetti, Francesco;Cirillo, Daniele;Totaro, Cristina
下面是一个第四纪和活跃的正断层系统的地质研究，该系统出现在意大利亚平宁山脉南部的一个发震区——波里诺地区。2010 - 2014年，本区受持续时间较长的地震活动影响，主要发生在2012年5月（Mw 4.3）、2012年10月（Mw 5.2）和2014年6月（Mw 4.0）。将构造地质数据与形态构造和遥感分析相结合，确定了震中区内和附近推断出的活动断层段的几何形状、运动学、横切关系和滑动速率。重建了以低角度东、北北东向断裂和反向高角度西、西向断裂为特征的不对称伸展格局。利用高分辨率震源分布对断层的深度几何形状进行了约束。整个系统与震源机制和大地测量资料得到的变形场吻合良好。将断层模式与波里诺地震活动的时空演化进行对比，确定了两条近平行的西西向断裂的发震源，并对其发震潜力进行了评价。在重建的地震构造模型框架内，讨论了地震活动特有的垂直-断层走向演化。(C) 2016年作者。Elsevier Ltd.出版。
The following is a geological study of a Quaternary and active normal fault-system, which crops out in the Pollino area, a seismogenic sector of the Southern Apennines, Italy.From 2010 to 2014, this area was affected by long lasting seismic activity characterized by three major events which occurred in May 2012 (Mw 4.3), in October 2012 (Mw 5.2) and in June 2014 (Mw 4.0). The integration of structural-geological data with morpho-structural and remote sensing analyses, led to define the geometry, the kinematics, the cross-cutting relationships and the slip rates of the inferred active fault segments within and near the epicentral area.We reconstructed an asymmetric extensional pattern characterized by low-angle, E and NNE-dipping faults, and by antithetic, high-angle, SW- to WSW-dipping faults. The geometry of the faults at depth was constrained using high-resolution hypocenter distributions. The overall system fits well with the deformation field obtained from focal mechanisms and geodetic data.Comparing the fault pattern with the time-space evolution of the Pollino seismic activity, we identified the seismogenic sources in two, near-parallel, WSW-dipping faults, whose seismogenic potential were assessed.The peculiar perpendicular-to -fault-strike evolution of the seismic activity, is discussed in the frame of the reconstructed seismotectonic model. (C) 2016 The Authors. Published by Elsevier Ltd.