Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

First Records of 1384 AD Shahr-e-Rey’s Historical Earthquake on Pishva Fault based on Paleoseismology Researches, South East of Tehran

Document Type : Original Research Paper

Authors
T. Majidi Niri 1
H. Nazari 2
M. Ghorashi 2
M. Talebian 2
A. Kaveh Firooz 1
1 Islamic Azad University, Research and Science Branch, Tehran, Iran
2 Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran.
10.22071/gsj.2011.54381
Abstract
Pishva fault with about 35km length is located between Alborz and Central Iran structural zones in southeast of Varamin. General trend of the fault is NW-SE (N38W, 33NE) which has reverse mechanism accompanied by sinistral component. Achieved Morphotectonic studies along the Pishva fault reveal its activity.  3-5 seismic events with recurrence time of 3265 years are identified by studying on two Paleoseismic trenchs T1 and T2, The youngest and oldest events are 0.87 Ka and 29 Ka respectively. According to Wells and Coppersmith equations (1994), the biggest and smallest computed earthquake magnitudes are respectively 7.08 and 5.9. It would be possible to assign Shahr-e-Rey 1384 AD earthquake to this fault, since Event 1 is 870 years old.
Keywords
Paleosiesmology
Trench
Pishva fault
Magnitude
Recurrence time
Earthquake
 
References
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Scientific Quarterly Journal of Geosciences
Volume 21, Issue 81
Autumn 2011
Pages 169-178