Horizontal to vertical spectral ratio in different geological formations

A study of horizontal-to-vertical (H/V) spectral ratios with the short duration data in different geological formations with varying soil thicknesses were carried out. The study has been implemented by using the ambient seismic noise and hammer impact to determine the fundamental frequency and the corresponding amplification of soils. In addition, the average shear wave velocity (Vs³⁰) was calculated to infer the stiffness of soils. The results are correlating well with the local geology and therefore testify that the short duration data is adequate to estimate the H/V spectral ratio in site characterization and microzonation studies.