More seismic activity in east Tehran than west/Necessity to develop seismic stations in southern Tehran

According to RCO News Agency, Dr. Mohammad Tatar, Professor of Seismology Institute of International Seismology and Earthquake Engineering, today at a special meeting of the International Institute of Seismology and Earthquake Engineering, entitled “Earthquake Risk Investigation in Karaj City, given to the recent earthquake events. Northeast is far more than other parts of Iran; Although the number of earthquakes in Zagros is higher, the northern earthquakes are more destructive due to the liberalization of high energy.

Referring to studies from Tehran to Karaj, he said: Studies show that this area is extremely surrounded by main and active faults. These faults are scattered both around Tehran and within the city, although our information on the exact geometry of the faults in the city is still not complete.

The seismic specialist, referring to the historic earthquake of the year in Taleghan with magnitude of 4.3, as well as the earthquakes of the years 1 and 2 on the fault of the Masha Masha with magnitude of 4.3 and 4.3, added: “The historical history of severe earthquakes in the area is one of the most likely signs of the probability of an earthquake.” The most important earthquake recorded in this area was the earthquake in Bojin Zahra.

Referring to the relatively good coating of seismic devices in Central Alborz, Tatar said: There are about 2 to 5 permanent stations in the area, most of which cover Tehran. A network of temporary stations has also been installed during international projects with universities such as Cambridge and Joseph February in various areas, including Tehran and Firouzkouh. This data, along with new acceleration stations, has helped us provide a comprehensive analysis of the seismic of Tehran.

Professor of Seismology Research Institute of Seismology and Earthquake Engineering, analyzing data registered over the past five years, said: Seismic activity in eastern Tehran is far more significant than the west. This could also be a warning for the possibility of energy accumulation and earthquake in west Tehran.

According to him, in the past two decades, despite numerous small earthquakes, only two earthquakes have been registered in the area, with only two of which were above 5. The two include the earthquake of the year 2 and the earthquake of the year in the central area of ​​the Makhsha fault, both of which were felt in Tehran.

Referring to the recent earthquakes in East Tehran, Tatar said: The earthquake in the Firoozkooh and the May 6 in the central part of the Masha Fault has raised concerns. In both cases, numerous aftershocks were recorded that show the faults are active. These aftershocks are recorded and analyzed by the National Seismic Network.

He added: Contrary to the initial notion that the May 6 earthquake was attributed to the Firouzkouh fault, more accurate analysis showed that the earthquake was related to the eastern part of the Sorkheh Hesar fault; Facility with normal component and tensile structure. The earthquake, with the largest earthquake of 4.1, has been the most severe earthquake in the last few decades in eastern Tehran and has brought many aftershocks.

Tatar emphasized: In order to evaluate the risk of earthquake in Tehran, the geometry of active faults must be reconstructed and analyzed using accurate data from permanent and temporary stations. Currently, due to the weakness of seismic stations in southern Tehran, there is no accurate information on the geometry of faults in the area, and this is a major weakness for accurately assessing the risk of earthquake.

The end of the message