TITLE:
Evaluate Tectonic Activity of Tehran City (Iran) Based on Geomorphic Indices, Field Investigation and Remote Sensing Study
AUTHORS:
Z. Mohammadi Asl, M. R. Abbassi
KEYWORDS:
Alborz Mountain, Geomorphic Indices, Asymmetry Factor, Basin Shape Index, Mountain Front Sinuosity
JOURNAL NAME:
Open Journal of Earthquake Research,
Vol.8 No.1,
January
11,
2019
ABSTRACT: Active tectonics in the south part of Alborz Mountain (Iran) has greatly influenced
the drainage system and geomorphic expressions. The metropolis of
Tehran is located at the southern foothills of the Alborz Mountains at the abrupt
topographic boundary between the mountain range and the northern
border of the central Kavir Desert. The presence of active faults and tectonic
activity, threatens the area and shows the vulnerability of this Tehran city. So
the evaluation of active tectonics of Tehran City is necessary because of vast
human activity, which has hidden geomorphic feature. Active tectonics of
Tehran City was evaluated by using Digital elevation model (DEM) derived
drainage network and three geomorphic indices basin (asymmetry factor
(AF), basin shape index (Bs) and mountain front sinuosity (Smf)). The average
of the three measured geomorphic indices was used to evaluate the distribution
of relative tectonic activity in the study area. Furthermore to overcome
some inevitable error in this method, field investigation was carried out
also remote sense was studied, and finally the obtained results were compared
with existing seismic data. The result confirms that the East South, East North
and West North Tehran have high rate of relative tectonic activity (RTA) respectively.