this dextral fault system transfers some of the dextral displacement along the main recent fault onto thrust faults and folds of the fars domain as the relative motion changes from strongly oblique to near orthogonal. it also forms the effective southeastern boundary to the dezful embayment. in detail the kazerun fault system consist of a series of en echelon segments within an overall fan shaped zone. from the focal depth of earthquakes along this zone it is clear that these faults are developed within the underlying basement rocks.