摘要
1994年Northridge地震和2001年Nisqually地震时,由于向斜基底对地震波的聚焦效应,造成了异常的破坏情况。文章介绍了基底界面的几何形状、沉积物速度和基底地形的深度对聚焦效应的影响。得出以下结论:在无限介质中,一是当盆地的几何形状为圆弧时,聚焦效应随着沉积物波速的增大而减弱。并且在固定弦长下,聚焦效应随着曲率半径的增大而减弱。二是当盆地的几何形状为半椭圆时,聚焦的焦点在一定的区域内。
The anomalous damage patterns developed by the focusing of seismic waves due to deep and shallow seated synclinal basement topography were reported during the Northridge earthquake of 1994 and the Nisqually earthquake of 2001,respectively.This paper presents the role of sediment velocity,depth and geometry of the basement topography in basement focusing effects on ground motion characteristics.The conclusions are as follows:In an unbounded medium,(1)when the geometry of the basin is semicircle,the focusing effect of the basin decreases gradually with the increase of sediment velocity.Under the fixed chord length,the focusing effect of the basin decreases with the increase of radius of curvature.(2)When the geometry of the basin interface is semi-ellipse,the focus of a basin can be summarized within a given region.
作者
田庄烨
TIAN Zhuang-ye(Key Laboratory of Structure Engineering of Jiangsu Province,Suzhou University of Science and Technology,Suzhou Jiangsu 215011 China)
出处
《江苏建筑》
2021年第2期71-73,83,共4页
Jiangsu Construction
关键词
盆地构造
地震波传播
地震动放大
聚焦效应
basin structure
seismic wave propagation
ground motion amplification
focusing effect
