  We endeavor to assess site response exploiting ambient noise measurements
which we carried out at 70 sites in different parts of Shillong City, one of
the seismically active regions. We estimate the spectral ratio from these
recordings. The spectral ratios reveal the resonant frequency for Shillong City
in the range of 3 to 8 Hz. Short scale spatial variation in the resonant
frequencies suggests that there is prominent lateral heterogeneity in the
underlying layers. Besides, a non-linear earthquake site response analysis is
also attempted using available geotechnical data. A good correlation is
observed between site response analysis and HVSR results constrained by wide
variation of resonant frequency at short distances. The results are found to be
tallying well with the geological data.
