A SIMPLE EXTRACTION METHOD OF THE SITE WHICH REQUIRES SPECIAL CARE ON SEISMIC DESIGN

Abstract

 As a design earthquake to check the seismic safety of a railway structure, the standard response spectrum of L2 earthquakes is generally used. In contrast, in the site which is located near large-scale source regions and/or where an earthquake motion is assumed to be significantly amplified, special care is required on the seismic design and L2 earthquake motions must be evaluated by site-specific prediction methods of strong ground motions. However, there has been a problem that clear indices for judging the magnitude of earthquake amplification do not exist. In this research, we have examined a technique to extract the points where earthquake motions are assumed to be significantly amplified by using high-density earthquake observation records in recent years and evaluation results of the amplification characteristics of earthquakes at seismic stations across the country. The validity of the proposed method is confirmed by applying the method to the past earthquake records. By using the proposed method, the site requiring special attention can be easily extracted considering the amplification characteristics on every site.