Fault-based probabilistic seismic hazard assessment of the eastern Makran subduction and the Chaman transform fault, Pakistan: Emphasis on the source characterization of megathrust

•Horsetail splays link the Chaman transform fault to accretionary prism of the Makran subduction.•In the gently dipping Makran subduction, megathrust interface geometry varies PGA by up to 0.3 g.•Gentler and deeper extending subduction interface maximizes rupture width and PGA towards inland.•Alternative recurrence models for megathrust interface resulted in up to 10% change in PGA.•475 yrs PGA is between 0.5 and 0.7 g at accretionary prism down to trench and along transform in the south.