LAUSR

Abstract In this research, to detect hidden faults around Persian Gulf artificial lake (22 District of Tehran), Ground Penetrating Radar (GPR) was used. Three profiles were studied in this method. South of Persian Gulf artificial lake there is a trench of which first profile is designed on top. There are eight observable subsidiary faults which indicate a high seismic potential of the target area. Second and third profiles are close and parallel to each other. They are designed 260 m far from north of Persian Gulf artificial lake. The GPR data prove the existence of faults and fractures in layers. A fault zone with an approximate length of 200 m in the northern part of the lake is found out. Generally, results suggest that second and third profiles in comparison with first profile, have more severe changes in layers conditions. In addition, subsidiary faults recognized are in the same direction of North Tehran fault (most dangers fault of Tehran). Therefore, they are absolutely fault branches of North Tehran fault.