Investigation of the active Celano–L'Aquila fault system, Abruzzi (central Apennines, Italy) with combined ground‐penetrating radar and palaeoseismic trenching
Investigation of the active Celano–L'Aquila fault system, Abruzzi (central Apennines, Italy) with combined ground‐penetrating radar and palaeoseismic trenching
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DOI：
10.1111/j.1365-246x.2003.02078.x
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发表时间：
2003-12
影响因子：
2.8
通讯作者：
S. Salvi;F. Cinti;L. Colini;G. D'Addezio;F. Doumaz;E. Pettinelli
中科院分区：
文献类型：
--
作者：
S. Salvi;F. Cinti;L. Colini;G. D'Addezio;F. Doumaz;E. Pettinelli
概要我们研究了阿布鲁齐地区（亚平宁山脉中部）Celano-L 'Aquila断层系统北方部分的断层崖沿着。长达109.5 km，高3 m的断层崖痕迹标志着奥克雷山山脊山谷的坡脚。为了提供这些陡坎的变形历史的直接证据，我们开始了地貌，探地雷达（GPR）和挖沟调查。探地雷达调查取得了地下地层特征的悬崖区，并确定了位置的挖沟网站。在两个不同的地点共挖掘了五条战壕。结合历史因素，对海沟暴露的结构和地层分析显示，在公元前5620年至公元1300年之间发生了三次断层事件;最近的一次发生在公元前1690年之后。这些事件中的每一个都产生了估计的最小垂直位移，范围在0.3和0.5米之间。我们的解释是，Mt奥克雷断层分支代表了一个35 km长的孕震构造的最北地表表现，该孕震构造与Mt 107地震有关。任何估计该地区地震危险的尝试都必须考虑到这一重要震源的存在。
SUMMARY We studied fault scarps along the northern sector of the Celano–L'Aquila fault system in the Abruzzi region (central Apennines). Up to ∼9.5 km long, 3 m high, fault scarp traces mark the slope foot of ridgetop valleys at Mt Ocre range. In order to provide direct evidence of the deformation history of these scarps, we initiated geomorphic, ground-penetrating radar (GPR) and trenching investigations. GPR investigations yielded subsurface stratigraphic features of the scarp zones, and determined the locations for trenching sites. A total of five trenches were excavated at two different sites. Structural and stratigraphic analysis of the trench exposures combined with historical considerations, showed three faulting events between 5620 BC and 1300 AD; the most recent of them occurred after 1690 BC. Each of these events produced an estimated minimum vertical displacement ranging between 0.3 and 0.5 m. Our interpretation is that the Mt Ocre fault branch represents the northernmost surface expression of a single 35 km long seismogenic structure associated with M∼ 7 earthquakes. Any attempt to estimate the seismic hazard in the area must consider the presence of this important source.