基于“映射圆”模型的汶川8．0级地震峰值加速度衰减关系  

Wenchuan 8.0 magnitude earthquake peak acceleration attenuation relationship based on a model of mapping circle

作　　者：刘平[1] 罗奇峰[2,3] 

机构地区：[1]同济大学 结构工程与防灾研究所,上海200092 [2]同济大学 [3]上海防灾救灾研究所,上海200092

出　　处：《振动与冲击》2013年第3期75-78,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51078273)

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。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.

关 键 词：地震动衰减关系 圆模型 断层破裂模型 “映射圆”模型 汶川地震 

分 类 号：P315[天文地球—地震学]