【摘要】 地震动衰减关系模型主要有三种类型:圆模型、断层破裂模型及椭圆模型,而这三种模型都存在一定弊端。在假设烈度与地震动存在某种线性关系的基础上,从等震线形状出发,将地震引起的断层破裂压缩到震中,压缩后的等震线从椭圆状变成反映圆模型的圆形等震线特性。用映射法描述该转变过程,并将该模型定义为地震动衰减关系的"映射圆"模型。结合汶川8.0级地震记录,分别回归出圆模型、断层破裂模型及"映射圆"模型的地震加速度峰值衰减关系。结果表明"映射圆"模型相对其它两个模型更加理想。更多还原

【Abstract】 At present,there are three ground motion attenuation relationship models with some shortages,including circle model,fault-rupture one and ellipsoid one.Based on assuming some linear relation between intensity and ground motion,and compressing fault-rupture to epicenter,then the intensity isoseismic map would have the characters of a circle model.This process was described with a mapping method of ground motion estimation,and this model was defined as a mapping circle model.Taking Wenchuan earthquake for an instance,three models including circle model,fault-rupture one,and mapping circle one were formed regressively and respectively.The accuracy of the mapping circle model was more ideal than others.更多还原