In this paper, a specific barrier model is calibrated to simulate ground motion in the Himalayan region. The Uttarkashi and Chamoli earthquakes are used to estimate the seismic parameters of the source model. Key seismic parameters are global stress drop and local stress drop. The parameters are estimated for κo and fmax filters. The local stress drop values for the two filters are different but simulate ground motion for the two filters are close. The simulated ground motions with estimated seismic parameters are compared with the observed ground motion for the Chamoli earthquake in the Delhi region and show closer results than predict ground motion using the stochastic finite fault method. The estimated seismic parameters are then used to simulate the future great earthquakes (Mw 7.5, 8.0, and 8.5) in the Delhi region at bedrock level from the central seismic gap of the Himalayan region.