Occurrence of epsilon in seismic hazard analysis disaggregation

The representation of the hazard at a site provided by the disaggregation procedure takes a step back from the probabilistically framed final outcomes and displays the hazard in terms of the readily understandable parameters. Disaggregation is usually used to compute the contributionsto the mean annual rate of exceedance from different scenarios. When the hazard is disaggregated, the result is a suite of M-R-Pairs that occur with various probabilities. Theidentification of the most critical earthquake scenarios is therefore made relatively transparent to the end user of PSHA,. the ‘dominant scenario’. as well as disaggregating the total hazard with respect to magnitude and distance, one should also consider the contributions to the hazard thatare made by various values of the deviation parameter in the GMPE (Є).when the hazard disaggregation is performed in terms of the three variables, M,R,Є, one is able to get a complete picture of where the overall hazard comes from. Design earthquakes are needed for additionalcharacteristics of the ground motion to be modeled, such as time histories, nonlinear analysis of structures, and duration of motion and critical pulses. in this study , probabilistic seismic hazard assessment and deaggregation for epsilon (Є) for two sites located in the cities of hamedan and zanjan was developed and compared.

Keywords:

probabilistic seismic hazard analysis (PSHA) , disaggregation , design earthquake , ground motion , dominant scenario , Design earthquake