Seismic Hazard Analysis and Preparation of Risk Spectrum in Mashhad for Design, Construction Urban and Suburban Infrastructures

The experience of recent earthquakes and the damage caused by it in various types of structures including vital arteries and transportation infrastructure suggests that researchers are more concerned with investigating and revising the effective seismic parameters in different regions compared with the proposed acceleration of codes. In this research, the study of seismic risk analysis and design hazard spectrum in Mashhad city located in Khorasan Razavi province have been conducted using probabilistic and deterministic methods. Thus, the seismic hazard curve and the spectrum design have been calculated and compared in an area of 100 km2 in 1 × 1 km2 networks and considering the effective parameters on it, including determining the active faults as a linear seismic sources and their effective length and distance, the maximum earthquake occurrence with applying of different attenuation relations. The obtained results indicate that the maximum ground acceleration in Mashhad city was determined 1.49g by the deterministic method and also its values for the return period of 50 years, including the probability of 2, 5, and 10 percent were respectively calculated and estimated 0.34g, 0.43g, and 0.61g by probabilistic method and the uniform risk spectrum was prepared using various methods by considering Ghodrati Amiri et al. attenuation relation.