 The Weha Graben is an active Cenozoic continental rift with frequent seismic activity. Previous studies have focused on the boundaries of the Graben, while less attention has been paid to the faults within the Graben itself. This study identified a fault in the Qingha River area of Sanyuan County, north of Xian, which had previously been unclear due to its shallow depth and activity. Seismic reflection profiling and borehole explorations were conducted, along with a geological survey, revealing a Y-shaped structure with a fracture zone width of approximately four kilometers. These findings suggest that the Qingha fault is an active Holocene fault and capable of producing earthquakes of magnitude 5.2 to 5.5. The discovery of this fault indicates that the Weha rift is still active, and that the faults within the rift are playing an important role in tectonic deformation. This article was authored by Wei Li, Wei Li, and Xi Jia Feng.