Evaluation of the Relationship between the Fault's lineament Index, and Seismicity, along the Railway lines of Hormozgan Province

faults are the most important factor in creating an earthquake, basically, having different seismic powers, and able to create small and large earthquakes. Therefore, identifying the faults found in each region, and recognizing their type and range of activities, can greatly reduce the damage caused by their performance. this research tries to evaluate the relationship between the fault's lineament index, and seismicity, along the railway lines of Hormozgan Province. The lineament index, as a quantitative measure of the severity of fault in each region, is a function that in processing of which, the number, length, and intersection of the faults per area-unit, are subjected to computational calculation. For this purpose, the faults of the region, in a distance of 100 kilometers from the railway lines, are extracted from the railway lines using the geological maps and radar images and then the lineament index is calculated using the Arc GIS software, and finally preparing this Location map, using this index. Investigating the relationship between seismic data and fault density, with the distribution pattern of lineament index, indicates the relative correlation between faults density, also the distribution pattern of earthquakes with the lineament index in the studied area. In a way that, results showed that 15.33% of the total seismicity occurred in the area (the seismicity higher than 4 Richter) in the Pf5 index category, encompassed only 4.26% of the total area surface. And only 3.54% of the earthquakes occurred in the Pf1 index category, which accounted for the highest percent (27.07%) of the region. In other words, by increasing the lineament index, the density of earthquakes occurred in the area is also increased. This research is unprecedented due to its study of the fault density, as well as the relationship between the fault lineament's area and the number of earthquakes.