Abstract
In designing road or railway facilities, the Level 2 earthquake is evaluated mainly from the records observed in the 1995 Hyogo-ken Nanbu earthquake. These records were observed at the site, where the strong motion was largely amplified because of the influence of the deep seismic bedrock. However, the ground motion is not so much amplified at the site with the shallow bedrock. We, therefore, propose the response spectra for the Level 2 earthquake considering the depth of the seismic bedrock. In the area of shallow bedrock, we can make the designed spectra about 30 percent smaller than that in the deep area at the longer period. Using these proposed spectra, structures can be constructed more reasonably on the stiff ground in the mountain side etc.
