A STUDY ON SINGLE STATION MICROTREMOR H/V SPECTRAL RATIO FOR DETECTING THE SITE RESPONSE CHARACTERISTICS IN TORUL DISTRICT OF GÜMÜŞHANE CITY TURKEY

Microtremor H/V spectral ratio has gained popularity to assess the dominant frequency of soil sites and local stratigraphy, and to obtain subsoil properties. The aim of this study is to detect the site response characteristics for Torul district of Gümüşhane city, Turkey, by using the ratio of the horizontal to vertical components of Fourier amplitude spectra, designated as H/V spectral ratio model of Nakamura method based on the single station microtremor data analysis. For this purpose, the parameters such as predominant frequency, H/V ratio and predominant period were calculated for 12 measurement points with CMG-6TD three component broad band velocity seismometers and the ground classifications according to predominant periods were made. The predominant period changes between 0.101 and 0.349 sn, and H/V ratio varies from 1.06 to 2.03 for study region. These results show that there are two transient zones (Z1 and Z2) between different geologic structures in Torul region.