Seismic Hazards Assessment of Northwest of （西北的地震危害评估）.pdfVIP

Seismic Hazards Assessment of North-west of Iran, Ardabil city Abbas Arjmand Noshahr MSc. Student of Earthquake Engineering, Mohaghegh Ardabili University, Ardabil, Iran Gholamreza Nouri Assistant professor, Faculty of Engineering, Payame Noor University, Tehran, Iran Mehrdad Azadi Hir Department of civil, Germi Branch, Islamic Azad University, Germi, Iran SUMMARY: A seismic hazard assessment is presented for the city of Ardabil in order to determine design earthquake and geotechnical hazards assessment. Ardabil is a city in northwest of Iran that some destructive earthquakes were reported due to existence of active faults. Seismicity parameters on the basis of historical and instrumental earthquakes are calculated using Tavakoli’s approach and Kijko method. SEISRISKIII software has been employed for seismic hazard assessment. The study area was divided into a grid of 1×1 km2 elements and sub- surface ground condition data from 150 borings was collected and analyzed. Site response analyses were carried out on each representative profile using 20 rock input motions. Distribution map of peak ground acceleration throughout the city were developed, providing a useful basis for land-use planning in the city. Keywords: Seismic hazards assessment, PGA, Design Earthquake, Microzonation map 1. INTRODUCTION Iran is one of the most seismic countries of the world. It is situated over the Himalayan-Alpied seismic belt and is one of those countries which have lost many human lives and a lot of money due to occurrence of earthquakes. Fig. 1 shows recent seismicity of Iran (Tavakoli and Ghafory-Ashtiany, 1999). The city of Ardabil in northwest of Iran, is a touristic city which existence of active faults, alluvium deposits of the region, and the occurrence of sev