Fig. 1

Comparison between the J-SHIS velocity structure model (Version 1; Fujiwara et al. 2009) and the site amplification factors at strong motion stations; a the color contour indicates the thickness of the layers with a shear wave velocity less than 2,000 m/s in the J-SHIS model. The circles indicate the strong motion stations where the site amplification factors were evaluated by the GIT analysis (Nozu and Sugano 2010). Blue circles show stations with small site amplification factors less than 5 averaged over 0.2–0.3 Hz. Yellow circles show stations with large site amplification factors in the range of 5–20 averaged over 0.2–0.3 Hz. Red circles show stations with very large site amplification factors greater than 20 averaged over 0.2–0.3 Hz. b the same as (a) but the circles indicate the strong motion stations where the site amplification factors were evaluated in this study based on the records of the May 24, 2013, Mw8.3 earthquake. Blue circles show stations with small site amplification factors less than 5 averaged over 0.2–0.3 Hz. Yellow circles show stations with large site amplification factors in the range of 5–20 averaged over 0.2–0.3 Hz. Red circles show stations with very large site amplification factors greater than 20 averaged over 0.2–0.3 Hz