Usi0M moditil’d technique of Midorilcawa (1993) a method of ..umalin, peak ground acceleration from tho model of rupture plano hu been propo.d iD thil work. The teChnique hu bela tIIIted for Uttarkuhi oarthqW&k.e of 20th Oct. 1991 whicb was well fCiCOrded on atrooa motion array. After identifiCCiCMl of causative fault. rupture bas been modelled and peak w;:celerations were simulated at thoae thirteen statiODI which bid already recorded this arthquake. Peak acceleralions obtained after modelling are compared with that from tbtl field rooorda and cormistency in the COmparifolOD confirm the efficacy of the iipproach. Simulations from IleVCral models were made to study the depcmdcncy of pl\’l6eOt lMlhodolo,r on various empirical relation. and modelling~. The study confirm the utility of this mdhod for predicting peak ,round acceleration over the conventional method of using attenuation relation for this PUlpO~.