<p>The present work proposes the assessment of seismic hazards in the Uttarakhand Himalaya using Arias intensity (<i>I</i>_<i>a</i>) and modified Mercalli intensity (MMI). The <i>I</i>_<i>a</i> is computed using acceleration waveform data and the available empirical relation. A close similarity of <i>I</i>_<i>a</i> values computed from waveform data and empirical relation validates the applicability of this relation for the Uttarakhand Himalaya. After validation, the empirical relation is applied to generate the Arias intensity map for earthquakes of magnitude ≥ 4.5, and it is correlated with the available MMI scale. Subsequently, an empirical relationship is established between the obtained <i>I</i>_<i>a</i> values and the MMI scale. This relation is further utilized to prepare the <i>I</i>_<i>a</i> and isoseismal map in terms of the MMI scale for future potential earthquakes of magnitude 7.5 and 8.5 (M_w). The proposed isoseismal map for future anticipated earthquakes (M 8.5) reveals that a large population along with famous sanctuaries like Badrinath, Kedarnath, and Haimkunth Sahib falls within MMI scale ≥ IX, which causes considerable damage. The simulated results provide maximum peak ground acceleration (PGA) values of 840 gals and 513 gals for the 8.5 and 7.5 magnitude scenario earthquake at the Uttarkashi station. The present study identifies the vulnerable zone for seismic hazards, which provides insight into assessing and mitigating the risks associated with the study region.</p>