Seismic hazard analysis and acceleration spectra for different seismic levels for retrofiting Gas pressure boost stations

Since the lifelines during an earthquake is of great importance and the gas pressure boost stations are at the heart of the critical arteries of the gas lines Therefore, today the retrofitting of their structures is considered. The first step is the process of seismic hazard analysis of the site. Seismic hazard analysis is performed to determine the base designed acceleration and site design spectrum for a given site. In this study, seismic hazard analysis was performed for the site of gas pressure boosting station in Qom region (Geographic coordinates are 34.237736 degrees north and 50.554062 degrees east). The linear design spectrum of the sites is also provided for the site with different seismic levels. During the risk analysis, seismic information was used in accordance with the geological conditions of the site. Also considering the importance of choosing attenuation relationships in the risk analysis process, three well-known attenuation relationships have been used. Finally, the logical tree method was used to combine the results. In the seismic analysis process, two methods of deterministic risk analysis (DSHA) and probabilistic risk analysis (PSHA) are used and they have been used as a complement to each other in risk analysis. The design spectrum of the site is presented in the form of diagrams, spectral maths and data tables and Relative acceleration map is also provided for an area with a radius of 200 km to the center of the site.