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During the 2011 Off the Pacific coast of Tohoku Earthquake, buildings and residential houses were severely damaged due to the ground motion at the downtown area of the Namie town, Fukushima prefecture. Damages survey revealed that the damage ratio was not uniform even in the downtown area. In order to clarify the reason, we observed ground motions during aftershock events and microtremors in the downtown area of Namie town. The H/V spectra obtained from single station observations imply that the peak frequencies uniformly distribute in the downtown area. S-wave velocity models obtained from array observations indicate very low velocity in surface soil layer.

Evaluation of site response on downtown area of Namie town, Fukushima, based on microtremor and aftershock observations