B ) relative velocity response spectrum ( sv ) and relative displacement response spectrum ( sd ) : the variation of velocity spectrum with depth is similar to that of acceleration spectrum . but the variation of displacement spectrum with depth is a little different to that of acceleration and velocity spectrum . that is , in strong earthquake , the variation of displacement spectrum and normalized spectrum in different depth is very small ( 2 )速度反應(yīng)譜( s 、 )和位移反應(yīng)譜( sd )沿深度變化的規(guī)律速度反應(yīng)譜沿深度變化的特點(diǎn)與加速度反應(yīng)譜基本相似;位移反應(yīng)譜沿深度變化的特點(diǎn)與加速度和速度反應(yīng)譜有較小差別,即強(qiáng)震時(shí)位移反應(yīng)譜和標(biāo)準(zhǔn)位移反應(yīng)譜沿深度的變化很小。