عنوان مقاله [English]
نویسنده [English]چکیده [English]
Combinations of geological, geomorphic, aeromagnetic and remote sensing data used to clarify the extent and nature of terminations of the Taleqan Fault in south Central Alborz. The Taleqan fault is cut by three transverse basement faults that are different in nature and age. Geological evidence along the Karaj Valley shows that N-S transverse faulting although influenced the Eocene sedimentation in the Taleqan Fault hanging wall. The western termination of the Taleqan Fault is hidden under alluvial fan deposits that showing evidence of Quaternary deformation. Several lineaments mapped in these Quaternary deposits that illustrate a horsetail fault system for the western termination of the Taleqan Fault. Geomorphic study in this area (Af, Hi, Vf, Smf) show high tectonic activity (Iat: class 2). The eastern termination of the Taleqan Fault linked with a Mesozoic rift-margin transfer fault. The western portion of the fault i.e. from the Karaj Valley to west is tectonically active that poses major seismic hazard to the Tehran, Karaj, Taleqan and Hashtgerd.