Active tectonic and earthquake risk potential in Tabas region

Subject Areas :

Ahmad  Adib ¹ (عضو هیئت علمی دانشگاه آزاد اسلامی، واحد تهران جنوب)

Received: 2016-09-06 Accepted : 2016-09-06 Published : 2009-09-23

Keywords: active tectonics, Kalmard fault, Tabas fault, earthquake risk analysis,

Abstract :

There are some active and quaterner faults in Tabas region such as Kalmard, Tabas, Nayband,Cheshme Rostam, Zenoghan, Ghoorichay, Anarak-Takhtnader and Ghadir that play role in seismicityof the region. Seismotectonic properties and seismicity effect estimatation of any sources is necessaryfor resistation of the cities. For this reason, amplification of alluvial sediments that affects the factorsof strong ground motion such as acceleration, velocity and displacement, is important too. Earthquakezonation and risk analysis are important for Tabas city because of the city importance and existence ofmain industrial, economical centers and major ways in this city. Recorded earthquakes with Mb = 7.6represented that the region is tectonically active. Based on geophisic studies and active tectonicindexes and earthquake risk estimation of the region, possibility earthquake event with M=6, is 50%,for return period 75y. In the center of the city, maximum horizontal and vertical acceleration for returnperiod 475y resulted from the potential earthquake, are 0.4g and 0.2 g, respectively.