Evidence of active tectonics in southern Italy: the Rossano fault (Calabria)
Evidence of active tectonics in southern Italy: the Rossano fault (Calabria)
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发表时间：
2010
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通讯作者：
P. Galli;V. Spina;I. Ilardo;G. Naso
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作者：
P. Galli;V. Spina;I. Ilardo;G. Naso
与第勒尼安侧不同，卡拉布里亚半岛的爱奥尼亚部分的地震构造在活动构造和地震活动方面仍然没有很好地定义。这项工作的重点是1836年发生在卡拉布里亚北部爱奥尼亚海岸的一次强烈地震（Rossano地区，Mw=6.2），通过应用多学科方法来找出可能的致病断层。由于对地震历史记录的重新评估——其中也包含可能的地表断裂描述——以及在中震区进行的地质、地貌、构造和古地震学分析，我们提出，鲜为人知的东西向正常的罗萨诺断层可能是1836年地震的原因。这条断层的特征是一个令人印象深刻的~100米高的直线陡坡，它将罗萨诺海岸冲积平原下的Sila地块的古生代岩石向下倾倒。对断裂的talus矿床进行绝对定年，再加上对无断层面几何形状和侧面的观察，可以假设晚全新世的地表多次破裂。
Unlike the Tyrrhenian side, the seismotectonics of the Ionian sector of the Calabrian peninsula is still not well defined, both in terms of active tectonics and seismic activity. This work focuses on a strong earthquake that occurred along the northern Ionian coast of Calabria in 1836 (Rossano area, Mw=6.2), by applying a multidisciplinary approach in order to find out its possible causative fault. Thanks to the reappraisal of the historical accounts of the earthquake - which also contain possible surface break descriptions - and to geological, geomorphological, structural and paleoseismological analyses carried out in the mesoseismic area, we propose that the poorly known, E-W striking, normal Rossano Fault might have been responsible for the 1836 event. This fault, which is characterized by an impressive ~100-mhigh rectilinear scarp, downthrows the Palaeozoic rocks of the Sila Massif below the coastal alluvial plain of Rossano. Absolute dating of faulted talusdeposits, coupled with observations on the geometry and aspect of the fault free-face, allow to hypothesize repeated surface ruptures in the Late Holocene.