The growing emphasis on regeneration and sustainable energy has contributed to the rapid expansion of offshore wind turbines (OWTs) in recent decades. As the number of offshore wind turbines (OWTs) being built in earthquake-prone areas increases, it is critical to monitor these OWTs for earthquake loads in addition to wind and wave loads. The Gujarat coastline in India is well-known for its significant offshore wind generation capacity. Nevertheless, the area has identified by a significant level of seismic activity, with previous occurrences of substantial earthquakes. The objective of this study is to examine the seismic susceptibility of jacket and monopile supported multi-megawatt OWTs in order to evaluate their suitability of implementation along the Gujarat coast. A three-dimensional finite element model of jacket supported OWT is developed in Abaqus CAE. In this study, designed acceleration response spectra in IS 1893 consistent with peak ground acceleration (PGA) values for 10% probability of exceedance for various exposure time are given as input in order to carry out the response spectrum analysis under uni-directional shaking of earthquake loads. Finally, the relative vulnerability of these structures under seismic motion is determined by identifying the demand to capacity ratio of different engineering demand parameters for serviceability and ultimate limit state design, corresponding to various PGA values under different exposure time. The output of the study provides a valuable insight to assess the vulnerability of the structure.