Using remote sensing data and GIS tools for preparation seismic zones map of Isfahan, Iran

Isfahan is one of the major cities in Iran in terms of population, economic and industrial growth, history, and tourism. Thus, seismicity and active fault identity are essential in this region. The current study examined the seismotectonics framework and earthquake hazard in 1:250000 scale map of Isfahan.The study area included the Northeast to the Southwest region, the Central Iran zone, the Sanandaj-Sirjan zone and the high Zagros zone. Using satellite images, historical and instrumental earthquake data, geological and tectonic maps and aeromagnetic map, the fundamental faults of the area and active seismic area were evaluated. Based on the available information, the seismotectonics map of the area was prepared and four seismic zones were distinguished. The results showed a significant intensification of seismicity from the Northeast to the Southwest direction. Seismic risk analysis in the study area using the Gutenberg-Richter law predicted the probability for an earthquake with a magnitude of 5.5 up to 6 on the Richter scale in the area during the next 100 years, 100 percent. The risk analysis of earthquakes with a magnitude of 6.5 on the Richter scale was 84 percent and the risk analysis of earthquakes with a magnitude of 7 on the Richter scale was 46 percent.