نوع مقاله : مقاله پژوهشی
گروه زمین شناسی، دانشکده علوم، دانشگاه ارومیه
عنوان مقاله [English]
The city of Ardabil is surrounded by many faults, including the seismic fault of Astara, which several earthquakes with low focal depth or near surface have occurred during its activity. In this research, 7 linear sources and 23 regional one has been identified based on geological maps and faults. Also, we used seismic data and Matlab, Zmap, Kijko and Ez-frisk softwares. Graphs of seismic data, show an increase in the return period of earthquakes, with a large increase, so the probability of an earthquake event in a certain period of time decreases. For example, in a 100-year period, the probability of an earthquake with a magnitude of 6 is 90%. Earthquake hazard map for PGA (Peak Ground Acceleration) was performed on bedrock with 1% damping for a return period of 50 and 475 years in a networked point at 0.1°×0.1° and 0.05° × 0.05° intervals. According to the acceleration rate for the city of Ardabil, this area is divided into 4 micro-zones. The results show that the acceleration values in this range for PGA vary from 0.19 in the north to 0.21 in the southwest. It should be noted that the acceleration values are the same throughout each designated area, so the city of Ardabil can be introduced as one of the cities with moderate risk in seismicity analysis.