摘要
本文收集了丰富的强震资料，以峰值加速度为例，采用简单且体现近场峰值加速度ＰＧＡ震级饱和和距离饱和特性的衰减模型，研究了表征震级与距离饱和效应的Ｒ０（Ｍ）的性质。Ｒ０与震级相关，同时与震源性质、地震波频谱有关。在单个地震的Ｒ０（Ｍ）的求取中，由于Ｒ０与系数ｄ几乎呈线性关系，所以要求单个地震Ｒ０的值，必须先根据理论约束确定ｄ的大小。在检验衰减方程的预测效果时，不仅要判断衰减曲线是否反映了实测资料的平均变化趋势，而且要判断实测资料是否绝大多数落在８４％及１６％概率水平的预测曲线之内（±σ之间）。
The attenuation model for magnitude and distance saturations of near source peak ground acceleration is discussed by regression analysis of data of strong ground motion records in the paper. The result shows that the effect of magnitude and distance saturations to be characterized by R 0(M) depends not only on magnitude but also on the behaviors of the source and its spectra. The influence of factors on attenuation relation of near source ground motion peak acceleration are also discussed in accordance with the attenuation regression models, condition of strong motion record site, mechanism of earthquake, and so on.
出处
《工程地质学报》
CSCD
1998年第1期61-66,共6页
Journal of Engineering Geology
关键词
峰值加速度
近场
震级饱和
抗震设计
地震
Peak ground acceleration, Attenuation model, Ground motion saturation, Near source PGA.
