Tunnels have become an integral part of modern cities and metropolitan areas due to limited space and the rise in population growth in these areas. Data from past earthquakes have shown that tunnels are susceptible to severe/excessive deformation even though they perform better when compared to above ground structures. Seismic analysis of tunnels is important to evaluate how a tunnel will perform during earthquakes. In this work, numerical analysis and assessment of tunnels for seismic loading is conducted aiming to highlight the critical difference in the seismic performances. The geometrical configurations of the tunnel combined with the loading scenarios also significantly influence the magnitude and distribution of the seismic responses. The findings of this work shed light on the critical role of the geometrical configurations in the seismic responses of tunnels and this procedure can be applied as seismic assessment method to any tunnel shape, size and material.