资源环境科技发展态势分析平台

The Alto Tiberina normal fault (ATF) in Central Italy is a 50 km long crustal structure that dips at a low angle (15‐20°). Events on the fault plane are about ten times less frequent than those located in its shallower syn‐ and antithetic hanging‐wall splays. To enhance ATF catalogue and achieve a better understanding of the degree of coupling in the fault system, we apply a template matching technique in the 2010‐2014 time window. We augment by a factor 5 the detections and decrease the completeness magnitude to negative values. Contrary to what previously observed on ATF, we highlight intermittent seismic activity and long‐lasting clusters interacting with sequences on the shallower splays. One of these episodes of prolonged seismic activity, detected at the end of 2013 on a 30 km long ATF segment, suggest the ATF active role during an aseismic transient unravelled by geodetic data.