摘要
利用波函数展开法给出了浅圆沉积谷地对瑞雷波散射的一个高频解析解,并分析了入射频率、沉积谷地宽度和深度等因素对波散射的影响.数值结果表明,由于沉积谷地的影响,在入射波的近端,地表位移分布变得相对复杂,但位移幅值并不大;而在入射波远端,地表位移分布相对简单,但位移幅值却相对较大,多数情况下高于沉积地表位移幅值.
A high-frequency analytical solution for scattering of Raylelgh waves by a shallow circular alluvial valley was derived using wave function expansion method, and the solution was utilized to analyze the effects of incident frequency, width of the valley, and depth of the valley, etc. on the wave scattering. Numerical results showed that, because of the alluvial valley, the distribution of surface displacement at the side where wave arrives becomes relatively complicated, but the displacement amplitude is not large; the distribution of the surface displacement at far side is relatively simple, but the displacement amplitude is relatively large, and in most cases the amplitude is larger than that at the alluvium.
出处
《地震学报》
CSCD
北大核心
2006年第2期176-182,共7页
Acta Seismologica Sinica
基金
国家自然科学基金项目(50378063)
教育部新世纪优秀人才支持计划
关键词
沉积谷地
瑞雷波
散射
高频
解析解
alluvial valley
Rayleigh waves
scattering
high frequency
analytical solution
