摘要
将震源简化为有一定破裂长度的线状断层 ,定量研究了单侧破裂震源对地震动空间相关性的影响 .依据波谱随空间坐标的展开式 ,得到了描述地震动场相关性的表达式 .在远场假定下 ,给出了理论解析公式 ,并依据地震动 Fourier谱随空间坐标的展开条件 ,得到了计算地震动场孔径的理论公式 .最后 ,以一次地震为例 ,给出了孔径随震中距、方位角、频率变化的三维图象 .
On the assumption that seismic source is simplified as linear rupture fault with finite length, this paper quantitatively studies the seismic source effects on space correlation of strong ground motion. Based on expanding expression of Fourier spectrum of strong ground motion with space coordinate variables, this paper also gives an expression of describing correlation of strong ground motion field. According to far field condition the theoretical formula of the expression can be obtained. Furthermore, this paper presents a theoretical formula of estimating the radius of strong ground motion field, which depends on expansion condition of Fourier spectrum of strong ground motion, with space coordinate variables.At last, taking one earthquake as an example, this paper gives three dimension patterns of radius of the field with epicenter distance and azimuth as well as frequency.
出处
《地震学报》
CSCD
北大核心
2000年第5期509-516,共8页
Acta Seismologica Sinica
基金
国家自然科学基金!(5989541 0 )
地震科学联合基金
中国地震局"九五"项目!(95-0 5-0 2 -0 3-0 4 )
关键词
单侧破裂震源
地震动
空间
相关性
远场
unilateral rupture fault
strong ground motion
space correlation
far field
