[SIT32-P04] Probabilistic seismic hazards for Tibetan Plateau and adjacent regions estimated using multiple seismic source and attenuation models
Keywords:Tibetan plateau, probabilistic seismic hazard, peak ground acceleration, spectral acceleration, logic tree
In this study, we estimate the probabilistic seismic hazards for the Tibetan plateau and adjacent region based on five attenuation models along with three different seismogenic source models (smoothed gridded, linear, and areal sources). In order to capture the epistemic uncertainties, a logic-tree structure was used assigning different weighting factors for various models. The peak ground acceleration and spectral acceleration at 0.2 s and 1.0 s were quantified for 2% and 10% probability of exceedance over 50 years considering the bed rock site condition. The hazard maps depicted significant spatio-temporal variations. This study provide new constraints on the improvement of seismic zoning map and consequently on the refined seismic building design codes for the Indian-Eurasian continental collision zone.