Abstract
Based on the DCRC strong-motion records in Sendai, site amplification characteristics in Sendai city during the 2011 Tohoku earthquake sequences are investigated. It is found that short-period (less than 1s) amplifications are predominant at northwestern area, while not only short but also long-period (around 3s) amplifications are predominant at southern area of Sendai. Such spatial differences are generally explained by the existing subsurface structure models, except that the backfilled soil model may be necessary to change and long-period later phase cannot be well explained in the southern area of Sendai.
