Seismic hazard analysis and zoning of Hashtgerd area

Abstract

The geological position and faults of Iran have caused earthquakes in the country throughout history. Assessing the seismic hazard of Tehran as the capital and its suburbs due to direct impact on the city of Tehran is very important from the viewpoint of earthquakes and the risks and possible damage caused by possible earthquakes to rehabilitate the more dangerous and vulnerable areas, as well as the creation of suitable facilities for the time of crisis... The hashtgerd range has high seismic activity due to its geographic proximity to Tehran. This is due to the construction of Hashtgerd new town, which has caused the extraordinary increase of human and urban densities in recent years to reduce the need of the region for more accurate and more rigorous surveying of seismicity. Risks make it special. In this research, using the conventional method of probabilistic seismic hazard analysis, the study area is located at 250 km radius of seismic studies and the estimated seismic riskiness of the area was estimated by analyzing the results. According to the study, the north and east of the region have higher fault densities. Also, according to the iso-acceleration map for a return period of 475 years, the maximum values are in the northern and northeastern strips as discrete zones and also in the southwest of Hashtgerd city in Najmabad area. The southern margin of the Alborz province generally has relatively less accelerated areas. The Hashtgerd city in the high danger zone ranges from 0.38 g to 46 g. Also, the map for the return period of 2475 years indicates that the maximum values are in the south of Hashtgerd, and Hashtgerd is in the range with an acceleration range greater than 0.68-0.85g.

Keywords

• probabilistic hazard analysis
• seismic sources
• seismic hazard zonation
• fault
• tectonic