Impact on Seismic Risk Analysis of Possible Pulse in Nearby Areas

Seismic risk analysis is the basis of advanced seismic regulations of the world. Therefore, extensive research is being done in the field of seismic risk analysis to solve the previous weaknesses of seismic risk analysis. Classical probabilistic seismic risk analysis (Cornell's method) estimates the seismicity of the region by considering the uniform distribution over the area and the large area. This characteristic causes the seismicity of the area is not estimated correctly in the areas near the fault, because the movement of the earth in this area is different from the far area. In this research, the effect of pulse on the results of probabilistic risk analysis has been investigated. The obtained results indicate that the pulse effects have a significant effect on the acceleration spectrum at close distances within the period limit of 0.2 to 1. So in the period of 0.5, this difference reaches 50% and with the increase of the distance the impact of the pulse decreases in the period limit and the amount of increase in the range of the spectrum decreases.