Horizontal-to-vertical component ratios for earthquake ground motions recorded on hard rock sites in Canada.

摘要

In seismic hazard assessment, site response is one of the most important factors to be determined. In this study, we. explore site response for hard rock sites in different parts of Canada. Rock response is an important component of the overall response of any site, and important in the interpretation of seismograms to separate source, path and site effects. The technique used for this purpose was originally proposed by Nakamura (1989) and further extended by Lermo and Chavez-Garcia (1993). According to this method, amplification can be inferred by taking the horizontal-to-vertical component Fourier spectral ratio (H/V) of the site. The hypothesis of this technique is that for a soft layer overlying a half space, the soft layer will amplify the horizontal component of ground motion, while amplification effects on the vertical component are small enough to be neglected.; The H/V method was applied to an earthquake database compiled from the records of 32, three-component, Canadian National Seismograph Network (CNSN) stations. These stations are located on rock outcrops. (Abstract shortened by UMI.)