双侧破裂模型对地震动空间相关性影响的定量研究  

Quantitative research on effects of bilateral rupture fault on spatial correlation of strong ground motion

作　　者：金星[1] 陈超[1] 张明宇[1] 王绍博[1] 丁海平[1] 

机构地区：[1]中国地震局工程力学研究所,哈尔滨150080

出　　处：《地震工程与工程振动》2001年第1期1-8,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金会的资助项目!(编号为59895410);地震学联合基金会资助(编号为95-07-444)

摘　　要：本文在震源为双侧线状断层破裂模型的假定下，根据震源理论和波谱随空间坐标的展开式，得到 了场地两点地震动Ｆｏｕｒｉｅｒ谱的表达式Ａｂ（ｆ）＝Ａｎ（ｆ）ｅｘｐ（ａ１ｒ０＋ａ２　）．文中提出了将双侧破裂模型 分解为两个单侧破裂模型计算双侧破裂模型ａ１和ａ２的数值方法．以一次地震（Ｍ＝６）为例，分析了双侧 破裂模型对地震动空间相关性的影响，计算了ａ１和ａ２的实部和虚部以及孔径随震中距、方位角和频率 变化的三维图像．On the assumption that the seismic source is simplified as a bilateral rupture linear fault with finite length, this paper quantitatively studies the seismic source effects on spatial correlation of strong ground motion. Based on the expanding expression of Fourier spectrum of strong ground motion with spatial coordinate variables, this paper also gives an expression for describing variable law of strong ground motion field, that is Ab(f)= Aa(f)exp[a1 r0+ a2 ]. The numerical method for calculating parameters a1 and a2 is given on the basis of the fact that the bilateral rupture fault is decomposed into two single-direction rupture faults. Finally, taking an earthquake as an example, this paper gives three-dimensional patterns of real and imaginary parts of a1 and a2, and the radius of the field with epicenter distance and direction angle as well as frequency.

关 键 词：双侧破裂模型 地震动 空间相关性 相关半径 地震工程 震源 波谱 

分 类 号：P315.9[天文地球—地震学]