The main faults active in Tehran and the region are as follows:Mosha-Fesham Fault. The Thrust fault Masha-Fesham fault is one of the basic faults of the central Alborz, situated in the north of Tehran, crossing the middle part of Jajrood basin.
It is sloped toward the north all along, varying between 35 to 70 degrees. This fault may be considered up lifting certain parts and as a thrust in certain others.
North Tehran Fault. This fault is the most salient tectonic factor in the vicinity of the city of Tehran. It begins in the slope of Alborz mountains and Toochal heights (35 kilometers), and extends from Kan in the west to Lashgarak in the east.
Its route is east, northeast, west and southwest, mildly sloped toward the south. In the west of Kan, it is cut through by various north east, south west, east and eastwest faults. In the east of Lashgarak, it enters a complex geological region and joins Mosha-Fesham fault.
In its central part, between Kan and Lashgarak, between the rocks of Karaj formation in the border stratums and sedimentary deposits of the alluvial desert, forms a corrugated border, which settles down on the southern layers.
South and north Rey faults. These two faults are the most salient faults in the southern plain of Tehran. They have dispersed on both sides of Rey subsidence.
Considering the geographical specifications of Tehran, the city is threatened by various natural factors such as earthquakes and floods. These threats are briefly discuses below.

Dispersion of Tehran faults

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Table 1.2 Number of earthquakes occurred in the 100-kilometer radius of Tehran

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Source: Institute of Geophisic,University of Tehran

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