Neomorphotectonic and seismic study of the north Firuzkuh are, TalarRud and BabolRud catchments, Alborz range

Document Type : Original Article

Authors

1 Assistant professor/Department of Geology,, University of Isfahan, Isfahan, Iran.

2 department of Geology, university of Isfahan, Isfahan, Iran

Abstract

In this research, the seismicity and neomorphotectonics of the eastern part of the Alborz range, which is delimited by the North Alborz fault zone and Firoozkuh Fault zone to the north and south respectively, has been studied. Eleven sub drainage basins in the study area along with the general northeast-southwest north-south trend and a sub-basin along the eastern-west trend were identified. The stream gradient (Ksn) and stream concavity (θ) morphotectonic indexes for all sub-basins were calculated where the range between 0.36-1 for θ and 72-288 for Ksn. The northern and southern rivers of sub-basins were tilted and several knickpoints were made by fault movements. A NE-SW striking fault zone with a width of 15 kilometers, is confined between Zarkin-Firoozkooh, Chashm, and Orim fault zones in the south, and Badroud and Lord faults in the north host the more magnificent earthquakes that have been occurred. a and b values were calculated to 3.84 and 0.85, respectively. The magnitude of earthquakes is between 2.4 to 4.2 values and the concentration depth of 60.7 percent of earthquakes is between 4.5 to 10 kilometers. Comparison of field evidence with calculations based on Ksn and θ indicators along North Alborz, Firuzkuh, Nord, LaleBand, and other fault branches, creating consecutive knickpoints from their activity is confirmed. Our results reveal low signals of neomorphotectonic and seismic activity in the middle part of the study area, which we would recommend for the development of the urban compared to the rest of the region.

Keywords

Journal of Tectonics
Volume 5, Issue 17
March 2022
Pages 1-23

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