The Alto Tiberina normal fault (ATF) in Central Italy is a 50 km long crustal structure that deepens at a low angle (15-20◦). Events on the fault plane are about ten times less 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 in the 2010-2014 time window. We augment by a factor 5 the detections and decrease the completeness magnitude to negative values (Mc = -0.2). Most of the new events behave as swarms interacting with seismic sequences on the shallower splays. Contrary to what previously observed on ATF, we highlight intermittent activity: as at the end of 2013, when increased microseismicity rate on a 30 km along-strike segment, concurrent with deformation observed from geodetic data, suggests an active role of the low-angle fault in tectonic extension.