Numerical fragility curves for shallow and deep tunnel in loose and dense sand proposed in this study and comparison with the empirical one expressed as a function of: (a) the PGA of the input motion (i.e. of a stiff and flat rock outcrop); (b) the PGA at the ground level (i.e. accounting for the site effects); (c) the PGV of the input motion; (d) the PGV at the ground level