Application of First Break Tomography Technology in Detecting Hidden Fault

First break tomography technology is a seismic prospecting method using first break pick to invert the velocity distribution underground. It is widely applied in identifying geological structures such as lithological interface, scarp structure and fault fracture zone. In this paper, this method has been carried on to investigate Yangqiao session in Anqing,part of Susong-Zongyang Fracture. According to two inverted velocity profiles accquired by tomography imaging technique, which lies perpendicularly to the target fracture,along with high-density electrical prospecting results and geological data, it could be speculated that the buried depth of the bedrock underground is about 25-35 m. Meanwhile, there lies a low velocity anomaly zone at the depth of 30 m, position of 130 m in line CZ1, 350 m in line CZ2. This should be the response of the Susong-Zongyang Fracture, which extends in the direction of North-East.