Evaluation of Geophysical methods for identifying hidden Quaternary faults in alluvial sediments (case study: Chitgar Park)

In this research, Geophysical methods Ground Penetration Radar (GPR) and Geoelectric have been used to detect hidden Quaternary faults in alluvial sediments located southwest of Chitgar Forest Park (District 22 of Tehran). The study of profiles (GPR) identified areas such as fault. The results obtained from two Geoelectric profiles indicate that there are two zones with low electrical resistance and high electrical resistance. Reduce the electrical resistance in the sediments of the area can be related to factors such as the existence of non-weathered rocks, the air inside the sediments, fine-grained sediments and being a forest of the study area, due to irrigation of trees and rainwater penetration underground. High electrical resistivity indicates crushing of rocks by fault activity, coarse-grained and dry sediment. The results of the methods used in this research indicates that there is a fault zone with an approximate length of 140 m. Considering the structural trends of most of the faults identified, it is very likely that the faults will continue along the upper part of the Chitgar Park. Due to the seismic potential and vulnerability of residential structures, especially in the north and northwest of the study area, the results of this research are important. Its use is recommended for analyzing tectonic hazards and improving the quality of thematic maps.