Spectral-acceleration-based attenuation relation in seismic hazard analysis (Case study: Qazvin city)

Abstract

Considering the situation of Iran on the seismic belt and its permanent exposure to earthquakes with different magnitudes, in design of structures, special attention should be paid to seismic parameters. To this effect, and in order to reduce the structures exposures to the expectable earthquakes short-term, mid-term and long-term planning is required. Numerous methods have been so far applied to assessment of earthquake magnitude some of which were built up on a single parameter such as PGA and PGV and some others were multi-parameters such as spectral displacement and spectral acceleration (SA). At any rate, today scientists using new parameters such as earthquake energy, earthquake intensity have introduced different methods for design purposes. One of the most widely applied design methods is the single parameter measure Peak Ground Acceleration (PGA) which has its own limitations and shortcomings such as error input into the calculations and ignoring earthquake content. Therefore, researchers decided by applying spectrum-based attenuation relation to use direct relationships for determining input data of structure design. In line with these efforts, profiting from SA-based power attenuation relation, this research as a case study attempts to retry the seismic hazard analysis calculations on the Qazvin region.