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Effects of Focal Mechanism on Near Field Response Spectrum of Ground Motion

DONG Di,SANG Xiang-guo,LIU Rui,LI Feng-jun(Institute of Engineering Earthquake of Qingdao,Shangdong Qingdao 266003,China)  
According to the focal mechanism the 92 groups of near field earthquake records from Europe,its neighbor regions and America are divided into 4 types.Based on the data,the effects of focal mechanism on near filed response spectrum and response spectra ratio in vertical and horizontal component of the acceleration records are analyzed.The results show that the effect of focal mechanism on response spectrum of different magnitude and different components has different features.Focal mechanism has not only some effects on the peak and peak position of response spectrum,but also on the shape of response spectrum in a certain extent.
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