Zoning of Earthquakes Occurred in Fars Province during 1900 to 2010 and Comparison it by Former Researches Findings

Zonings of seismicity of Fars province in Iran and comparison its’ finding to other researches results is aim of this paper. We used Statistical method for analyzing recorded earthquakes in study area during 110 years (1900 – 2010)، using GIS methods for this zoning. By using USGS seismic data of the region and fault maps، Excel software and ArcGIS، we prepare a seismic risk map of study area. Findings show that during study period we have 1636 earthquakes by 2. 5 t0 6. 9 magnitude. In the study area about 70 percent of earthquakes were lower than 4. 5 magnitudes; maximum of earthquake was for Lar and Arsanjan counties. Earthquake zoning shows that 60 percent of the Fars Province area in inside High level seismicity zone. Comparison between these researches by other researches findings shows that in our zoning، there are vaster areas inside low risk areas، but in past researches there was not low risk zones at all or there were limited areas. Based on this zoning most of population density centers (such as Shiraz and Lar)، and western parts of the province are inside High level risk of Earth quakes، but in past researches eastern part of province was inside high level risk zone. It seems that this zoning have higher accuracy، too.