APPLICATION OF LOGIC TREE APPROACH INPROBABILISTIC SEISMIC HAZARD ASSESSMENT FORTEHRAN REGION

The development of the new seismic hazard map of metropolitan Tehran, the capital city of Iran, isbased on probabilistic seismic hazard analysis, which implemented the logic tree approach. We use ۲۰potential seismic sources for area. The present study involved use of the several attenuationrelationships. Seismic hazard assessment is carried out for a grid of ۱۳۵۰ points with ۰.۱° intervalsusing a computer program for the area encompassed by the ۴۹.۵-۵۳.۵E longitudes and ۳۴-۳۷Nlatitudes. Two maps have been prepared to indicate the earthquake hazard of the region in the form ofiso-acceleration contour lines. They display the probabilistic estimates of peak ground accelerationsover bedrock for ۱۰% and ۶۳% probability of exceedance in ۵۰ years. The PGA values for the Tehransite are estimated to be ۰.۳۰g - ۰.۳۲g and ۰.۱۴g - ۰.۱۶g, respectively, for ۱۰% and ۶۳% probability ofexceedance in ۵۰ years

کلیدواژه ها:

Seismic Hazard ، PGA ، Probabilistic ، Logic Tree ، Tehran