Evaluation of Damping Ratio of Buildings Using Seismic Interferometry Method

Seismic interferometry method is applied to evaluate the internal attenuation of buildings regarding the building as the sedimentary layers of one-dimensional layered medium. The original wave field is reconstructed to be a new wave field expressed by deconvolved waves with virtual source at the top, consisting single up-going wave and single down-going wave reflected at the top. The damping ratio is evaluated from the transfer functions of up-going and down-going waves of the deconvolved wave at the 1st-floor of a building. The feasibility of this method is investigated using a homogeneous model, a 2-layer model, and a heterogeneous model, imaging 10 story buildings. We found that the damping ratios of those models extracted from the transfer functions were consistent with the preset values.