PROPAGATION OF RIGHT-LATERAL STRIKE-SLIP DEFORMATION TOWARDS THE INTERNAL PART OF THE LURESTAN ZONE, ZAGROS BELT, WEST IRAN

The NW-SE trending Zagros fold and thrust belt (ZFTB) in west Iran is result of the Neogene collision between the Arabian and Eurasian plates. Collision probably occurred in the middle Miocene followed by the continental shortening and oblique convergence to the trend of the belt. The overall convergence caused partitioning of the right-lateral strikeslip and shortening component on fault systems (Talebian and Jackson, 2002). In the northwestern ZFTB, the orogenparallel strike-slip is concentrated on the main recent fault (MRF) zone with NW-SE trend. Generally, this strike-slip movement of the oblique convergence is not confined to the MRF but also partitioned in the external parts of the belt, as the Marekhil-Ravansar fault system in the Kurdistan area of the Zagros (Sadeghi and Yassaghi, 2016). After the November 12, 2017 Ezgeleh-Sarpol-e Zahab Earthquake (Mw 7.3) it became clear that the Cenozoic strike-slip faulting is not confined to the orogen-parallel NW-SE trending faults, but it is distributed along the N-S trending active faults in the more external parts of the ZFTB. The focal mechanism of some aftershock events of the Ezgeleh-Sarpol-e Zahab Earthquake indicates an N-S strike-slip movement. The question arises about the effect of these N-S strike-slip faults on the folded structures of the Lurestan zone. Therefore, this study focused on the N-S trending strike-slip faulting along the Amiran anticline in the internal part of the Lurestan zone.

Keywords:

Earthquake , Strike-slip , Lurestan , Zagros , Amiran