Pprobabilistic seismic hazard assessment in south-west gas fields in Iran

This paper presents the results of seismic hazard analysis Investigation performed on south-west gas fields in Iran. Hydrocarbon reservoirs are among the most important energy resources in human life and in the industry, and thus, in the economy of every country. Seismic hazard analysis in hydrocarbon fields can be useful for the construction of refineries in hydrocarbon fields. To achieve this goal, in the first step, the historical and instrumental catalogs of earthquakes and faults of the proposed area were prepared. Then, two types of seismic sources, namely linear and area sources, were determined in this study. The maximum magnitude and seismic parameters were calculated for each source and appropriate attenuation relationship was chosen for strong ground motion. The attenuation equations used in this study are Boore & Atkinson. (2008), samervile (2001), Abrahamson and Silva (1997), Campbel and Bozorgnia (2003). The results of the seismic hazard analysis in this study show that peak ground acceleration (PGA) of the proposed area is in the range of very high-risk level. According to the seismic hazard zonation map of Iran (standard 2800), the site is located in a region with high risk and base acceleration of 0.35g that has been estimated to be 0.476g in this study. This difference is due to the existence of the near-site fault (that has the highest impact in the region seismicity according to the investigations conducted in this study) and the difference regulation of standard 2800 by the site-specific analysis.