抄録
Structural degradation of the East pagoda in Yakushi-ji Temple built about 1300years ago has become apparent in recent years. In this research, in order to evaluate seismic property of the east Pagoda, many seismographs were set at various points of the pagoda, and vibration tests were performed. By comparing the results of the West pagoda rebuilt about 25years ago, we have understood that the dynamic characteristics of central pillar of the East pagoda is unusual and the upper layer of the East pagoda shake widely.
