Study of seismotectonic and seismicity of Semirom

Subject Areas :

Mojtaba Rahimi Shahid ¹ , Nima Rahimi ² , Esmaiel Ghafouri Sedehi ³

1 - Ferdowsi University of Mashhad
2 - Faculty of Geology, University of Tehran.
3 - Department of Geology, Faculty of Science, Tarbiat Modares University.

Received: 2020-07-15 Accepted : 2020-07-15 Published : 2020-02-20

Keywords: Semirom, Seismotectonics, seismicity, fault, Kijko,

Abstract :

In this study, a range of 50 km radius of Semirom city for the seismotectonic and seismicity evaluataion is selected. A list of earthquakes happening in the area is prepared including 156 instrumental earthquakes with magnitudes of the unit Mw ≥ 3 since 1973 to 2018. Based on obtained results, due to the location of the study area in the Zagros Zone, seismotectonical mechanisms and structures of Semirom city influenced by this zone. Also, most earthquakes in the range of radius 50 km of Semirom region under the action of the Zagros reverse faults. The seismicity of the studied area from the north and northeast to the southwest is increased. Finally, by Kijko (2003) method, seismicity parameters, the annual rate of occurance and earthquake return possiblility for studied area is calculated.