Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

Amplification factor spectrum, using the observed horizontal ground motions database in the Korean Peninsula, has been obtained and compared with Standard Response Spectrum(Regulatory Guide 1.60), which was suggested by United States Nuclear Regulatory Committee. The observed ground motions from the Yongwol and the Kyoungju earthquake, respectively, which are supposed to represent domestic seismo-tectonic characteristics such as seismic source, attenuation of the propagation medium, and site specific effect, are used for the analysis of amplification factor spectrum. Fourier spectrum of the observed horizontal ground motions are also investigated for noise filtering from various origins. Amplification factors have been calculated by comparing the observed peak ground motions with results from responses to the observed horizontal ground motions only. The comparison has shown that the amplification factors resultant from this study exceed those of Standard Response Spectrum in the frequency ranges above 7-8 Hz. The results suggest that the characteristics of seismic ground motion, which are supposed to represent the domestic seismotectonic characteristics, differs from those of Standard Response Spectrum, especially at higher frequencies range.