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This contribution provides an updated planar seismic source\udcharacterization (SSC) model to be used in the probabilistic seismic hazard\udassessment (PSHA) for Istanbul. It defines planar rupture systems for the\udfour main segments of the North Anatolian fault zone (NAFZ) that are critical for the PSHA of Istanbul: segments covering the rupture zones of the 1999 Kocaeli and Düzce earthquakes, central Marmara, and Ganos/Saros segments. In each rupture system, the source geometry is defined in terms of fault length,\udfault width, fault plane attitude, and segmentation points. Activity rates\udand the magnitude recurrence models for each rupture system are established\udby considering geological and geodetic constraints and are tested based on\udthe observed seismicity that is associated with the rupture system.\udUncertainty in the SSC model parameters (e.g., <i>b</i> value, maximum magnitude, slip rate, weights of the rupture scenarios) is considered, whereas the uncertainty in the fault geometry is not included in the logic tree. To\udacknowledge the effect of earthquakes that are not associated with the\uddefined rupture systems on the hazard, a background zone is introduced and\udthe seismicity rates in the background zone are calculated using\udsmoothed-seismicity approach. The state-of-the-art SSC model presented here\udis the first fully documented and ready-to-use fault-based SSC model\uddeveloped for the PSHA of Istanbul

Planar seismic source characterization models developed for probabilistic seismic hazard assessment of Istanbul