摘要
许多实际的地震中已经观测到地表地形对地表地震动产生影响(地形效应),这种影响背后的成因、影响因素、影响规律至今还不太清楚,因此地震学中、地震工程学中都围绕这一课题展开了相应的研究.本文以地震波模拟为手段,以点力源激发下的SH横波地震波传播为对象,研究地形形态、震源的物理特征对SH波地表地震动的影响,研究内容主要包括:地形陡度和地形复杂度对地形效应的作用;震源所处位置、震源频率与地形效应的关系,揭示出地形效应的成因受局部地表张角的控制,张角越小地形的放大作用越强.
In many practical earthquakes some topography effects on the ground motion have been observed. However the cause, the factor and rules of these effects are not clear. Thus, many studies on this topic have been implemented. In the present paper, based on the SH waves＇ simulation due to a point force, the effects of the geometry of topography and the physical property of the source on SH wares are discussed. Then some conclusions are obtained which include mainly the effect of topographical dip, the location of the source and the source frequency. It is also found that one controlling factor of topographical effect is the slope angle.
出处
《地球物理学进展》
CSCD
北大核心
2010年第3期775-782,共8页
Progress in Geophysics
基金
国家自然科学基金项目(40874027)资助
关键词
地形效应
谱元方法
地震动
地形陡度
地形复杂度
topographical effect, spectral element method, ground motion, topographical angle, geometry of topography
