ANALYSIS OF STRONG GROUND MOTION RECORDS OF KOCAELI REGION FOR THE ASSESSMENT OF SITE FUNDAMENTAL FREQUENCY

The characteristics of earthquake shaking are affected by the local site conditions. In this study, the time history data from the Kocaeli earthquake records are taken. The object is to identify the predominant frequencies of the station sites through the acceleration data and to investigate the site response consistency. The system consists of more than 200 strong motion recorders with varying magnitudes. These recordings are thus utilized to investigate whether classical site response tools such as H/V and spectral ratios yield consistent results throughout the region of Kocaeli. In calculating H/V and spectral ratios the stations with the number of recordings three and above are chosen. Further, the predominant frequency values for current results are compared with NEHRP and QTM site class stations to assign site classes, and also site class maps are developed for further assistance in research.