Characteristics of Microtremors On Ground with Discontinuous Underground Structure
Characteristics of Microtremors On Ground with Discontinuous Underground Structure
复制标题
不连续地下结构地面微震特征
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
T. Kawanaka
中科院分区：
文献类型：
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作者：
K. Irikura;T. Kawanaka
本文研究了在地下结构垂直不连续区观测到的地脉动特征。现在正在进行的工作是在京都盆地南部的东部边缘附近进行的。地脉动的空间相关性特征受表层土壤垂直不连续性的显著影响。垂直分量的相速度对瑞利波的频散特性有影响.该地区的地脉动有从平原一侧向丘陵一侧传播的趋势，即从厚层一侧向薄层一侧传播。短于薄层厚度的波长的震颤似乎在遇到垂直不连续性后不久就转换成新的模式，但是那些足够长的波长的震颤似乎在更长的距离内维持旧模式。本文用面波在垂直不连续面上的透射和反射来解释脉动振幅的横向变化。
The characteristics of microtremors areexamined, which were observed in an area having underground structures with vertical discontinuities. The work in now going on is made near the eastern edge of the southern part of Kyoto basin. The spatial correlation characteristics of microtremors are significantly affected by the vertical discontinuities of surface-soil layers. The phase velocities of vertical components how the dispersive nature of Rayleighwaves. The microtremors in this area tend to propagate from plain side to hill side, i.e. thick layer side to thin layer one. The tremors of wave length shorter than the thickness of the thin layer seem to be converted to a new mode soon after coming across a vertical discontinuity, but those of sufficiently longer wave lengths seem to sustain the old mode for a longer distance. The lateral variation of the amplitude of microtremors is explained in terms of the transmission and reflection of surface waves at a vertical discontinuity.