THE ROLE OF SEISMICITY AND ACTIVE FAULT ZONES ON OPTIMUM SITE SELECTION FOR DESTRUCTED KHANOUK AND REYHANSHAHR TOWNS-EAST CENTRAL IRAN)

During Fe.22, 2005 southeast Zarand earthquake (Mw = 6.3) Khanouk and Reyhanshahr towns (located 15 Km away from southeast Zarand) experienced MMI intensity about VII and VIII and ancient parts of them were destructed. In the area occurrence of Kuhbanan Active Boundary Fault, it^,s SE terminations and Second Order Strike Slip faults have created active seismic zones with short time return period destructive earthquakes. Also, field investigations showed the recent earthquake faulting occurred along a pre-existing R type fault. In the other hand, co-sismic shear fractures induce shear stress on structures. Unfortunately, in Central Iran the main shocks often accompanying by co-seismic fractures due to brittle behavior of crust. Therefore, before rebuilding of Khanouk and Reyhanshahr towns active fault zones, especially those are causing co-seismic shear fractures, were mapped and developing sites was proposed on the safe lands far from Active Fault Zones.