Abstract: Following the 2008 Wenchuan M_S8.0 earthquake and the 2013 Lushan M_S7.0 earthquake, another strong earthquake of M_S6.1 occurred on June 1, 2022 in the southern segment of the Longmenshan fault zone, only 10 km away from the epicenter of the Lushan M_S7.0 earthquake. To investigate the seismogenic fault of the earthquake and the relationship between the two Lushan earthquakes, we relocated the mainshock and the aftershock sequences that occurred within 60 days, and obtained 933 high-precision relocation results, with average location errors of 0.15 km, 0.13 km and 0.23 km in the EW, NS and UD directions, respectively. The epicenters of the aftershocks have a slightly longer spread in the NE-SW direction. The focal depth is mainly located at depths of 12−20 km, with few aftershocks occurred above 10 km. The depth profile of the aftershocks shows that the seismogenic fault plane is southeast dipping, which is consistent with the tendency of the back thrust fault in the seismogenic fault structure of the Lushan M_S7.0 earthquake. The seismogenic fault structures of the two Lushan earthquakes intersect in a complex Y-shaped structure, which consists of two back thrust faults. The seismogenic fault of the Lushan M_S6.1 earthquake is the deeper one of the back thrust faults. As there is no surface rupture, we presume that the seismogenic fault is a deeply buried blind fault. The depth profile shows that the southeast-trending aftershock zone of the Lushan M_S7.0 earthquake crossed the Shuangshi-Dachuan branch fault, with most aftershocks concentrated below the fault. High-velocity anomalies in the upper crust beneath the fault zone are assumed to have blocked the back thrust fault of the Lushan M_S7.0 earthquake as it slipped upwards. However, the aftershocks of the Lushan M_S6.1 earthquake occurred mainly beneath the Shuangshi-Dachuan branch fault with no obvious high-velocity zone in the shallow direction of the seismogenic fault. We speculated that the Shuangshi-Dachuan branch fault may have played a blocking role in the slipping process of the seismogenic fault, impeding its rupture to shallow depths.