India, being seismically active, faces significant challenges with slope instability, particularly in regions like northern India, which are prone to high slopes and frequent earthquakes. The Himalayan region, characterized by tectonic activity, exacerbates landslide hazards. To address this, a dynamic analysis of a slope for its debris flow in Sikkim is done utilizing Finite Element Method (FEM) and Discrete Element Method (DEM) through the software Geo-Studio and Particle Flow Code (PFC). The analysis involved SLOPE/W and QUAKE/W modules in determining critical acceleration and slip surfaces. Entry and exit methods identified potential slip surfaces. Simulation in PFC incorporated a simplified grain size distribution curve and calibrated contact model parameters to model landslides and debris flow. Solid particles representing slope materials were used, with sizes based on grain size distributions. Equilibrium under normal gravity load was established before inducing slope failure via earthquake loading, using data from the IMD. Itasca's particle flow code computed the extent of debris flow and the new slope configuration.