国外水利水电工程设计中地震动参数(地震加速度)同样是很重要的资料，其取值的方法和原则与中国内地有很大的不同。
The seismic dynamic parameter (seismic acceleration) is similarly an important one in design of the foreign hydro projects but the method and principle of selecting its value are quite different.
文章最后给出了美国西部考虑震源破裂方向的地震动峰值加速度和均方根加速度的衰减关系。
Finally, the formulas of PGA and RMS accelerations attenuation dependent on the rupture direction of the seismic source are presented for the Western United States.
从多维地震动输入下的结构三维振动方程出发，给出了结构多维随机振动的振型位移法和振型加速度法。
From the equation of three-dimensional vibration of structures, the methods of multi-dimensional random mode displacement and mode acceleration have been put forward.
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