Abstract
By using the survey results in Sendai for the building vibration damages caused by the 2011 Tohoku earthquake (M9.0), we investigate the relationships between the strong-motion amplitudes and the damage ratios, which are classified by the structural types and the construction years. The following results are obtained: 1) Dependency of the damage ratios on the construction year is significant. 2) The obtained damage ratios for severe damages, especially to wooden buildings, generally agree with the fragility curves of Murao and Yamazaki (2002), Midorikawa et. al (2011), and Sakai et al. (2002). 3) By comparing with the survey results for the RC-building damages caused by the 1978 Miyagi-oki earthquake (M7.4), the damages for the 2011 earthquake, are heavy in Oroshi-machi, where the many old buildings are still used, while the damages are decreased for the 2011 earthquake in the other two areas, where the many new buildings have been constructed.
