THE NECESSITY OF REVIEWING THE MAP ACTIVE FAULTS OF TEHRAN

The curved ~ E-W trending Alborz active orogenic belt in the north of Iran, is a part of Alpine-Himalayan orogenic belt. The study area is located at the southern central Alborz zone from west Tehran to Bouin Zahra. The existence of active faults with high seismic potential based on some significant seismic records in this area, can be caused to the increase of the risk of the devastating earthquakes. The occurrence of historical earthquakes and the Malard᾽s recent earthquake (located in the Alborz province) with the magnitude of 5.2 in 2017, can be warning for future earthquakes in the area. . So, the study of neotectonics and identification of faults in Tehran and Alborz provinces, is very important. In this study, the zone faults were accurately identified using ETM+ satellite image processing. And With the help of aerial photographs of the 1340s, the effect of some faults was completed because their surface effect have been lost as a result of construction in recent years. In the following, aerial magnetic data processing is performed in the region to identify magnetic discontinuities and investigation of the mechanism and strike of major faults were identified on Magnetic basement. Due to the different distances applied in Upward Continuation filter, the dip of the fault plane on Magnetic basement is toward the north-northwest that is consistent with field observations. The results of this study confirm the application of new techniques for identifying and correcting the position of active faults in the Iranian crust, especially in the provinces of Tehran and Alborz.

Keywords:

Seismicity , Active fault , North Tehran fault , Alborz , Tehran , Iran