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Comparing Slip Distribution of an Active Fault System at Various Timescales: Insights for the Evolution of the Mt. Vettore‐Mt. Bove Fault System in Central Apennines
Tectonics ( IF 4.2 ) Pub Date : 2020-08-05 , DOI: 10.1029/2020tc006200
Irene Puliti 1 , Alberto Pizzi 1 , Lucilla Benedetti 2 , Alessandra Di Domenica 1 , Jules Fleury 2
Affiliation  

In 2016, the Mt. Vettore‐Mt. Bove normal fault system (VBFS) broke during three earthquakes (Mw 6.0, Mw 5.9, and Mw 6.5), associated with clear coseismic ruptures. Based on high‐resolution topography and geological field data, we determined the displacements of the VBFS. The distributions of the coseismic and postglacial displacements exhibit similar asymmetric shapes, suggesting self‐similar slip profiles over the last 18 kyr. The highest displacement during the 2016 events is localized on the southern Mt. Vettore segments, the southern tip of the VBFS, which also showed the maximum throw of 32 m over the last 18 kyr yielding to a very fast throw rate of 1.6 ± 0.5 mm/yr. Assuming a constant throw rate, the geological displacement we determined suggests an inception age of 200–250 kyr for the surface rupturing faults that ruptured in 2016 on the Mt. Vettore sector. This value can be interpreted as the minimum age for the onset of those faults in the Mt. Vettore and might result from a southward shift of VBFS activity with a change of the fault system pattern. We infer that the observed slip distribution, maximum at Mt. Vettore and tapering‐off southward, might be due to the VBFS lengthening processes towards the Laga Fault and its interaction with pre‐existing structure such as Olevano‐Antrodoco‐Sibillini thrust that might play a key role in controlling the VBFS's evolution.

中文翻译:

比较各种时间尺度上的活动故障系统的滑动分布:山的演化的见解。韦托雷山 亚平宁山脉中部的Bove断层系统

2016年,韦托雷山 Bove正常断层系统(VBFS)在三级地震(Mw 6.0,Mw 5.9和Mw 6.5)期间破裂,伴有明显的同震破裂。基于高分辨率地形和地质现场数据,我们确定了VBFS的位移。同震和冰期后位移的分布表现出相似的不对称形状,表明在过去的18年中,自相似的滑移剖面。2016年活动期间位移最大的地方是南部山。VBFS的最南端Vettore段也显示了在过去18年中最大的32 m抛射,产生了1.6±0.5 mm / yr的非常快的抛射速率。假设投掷率恒定,我们确定的地质位移表明,2016年在山上破裂的地表破裂断层的起始年龄为200-250年。Vettore部门。该值可以解释为山中那些断层发生的最小年龄。Vettore可能是由于VBFS活动向南移动以及故障系统模式的改变而导致的。我们推断观察到的滑移分布在Mt处最大。Vettore和向南逐渐变细,可能是由于VBFS向拉加断层拉长的过程,以及它与诸如Olevano-Antrodoco-Sibillini推力之类的既有结构的相互作用,可能在控制VBFS的演化中起关键作用。Vettore可能是由于VBFS活动向南移动以及故障系统模式的改变而导致的。我们推断观察到的滑移分布在Mt处最大。Vettore和向南逐渐变细,可能是由于VBFS向拉加断层拉长的过程,以及它与诸如Olevano-Antrodoco-Sibillini推力之类的既有结构的相互作用,可能在控制VBFS的演化中起关键作用。Vettore可能是由于VBFS活动向南移动以及故障系统模式的改变而导致的。我们推断观察到的滑移分布在Mt处最大。Vettore和向南逐渐变细,可能是由于VBFS向拉加断层拉长的过程,以及它与诸如Olevano-Antrodoco-Sibillini推力之类的既有结构的相互作用,可能在控制VBFS的演化中起关键作用。
更新日期:2020-09-09
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