Seismic ringing effect in the shallow subsurface
Seismic ringing effect in the shallow subsurface
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浅层地下地震振铃效应
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Lev
中科院分区：
文献类型：
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作者：
Shimon Rubin;V. Shtivelman;S. Keydar;A. Lev
我们把地震振铃效应看作是局部浅层非均匀性的动态响应，
入射波场起源于在地面工作的震源
或者来自背景噪声。在地震记录上，地震振铃波场通常表现为
具有明显共振特征的长波列集中在局部次表层之上
异质性基于理论和数值分析的振铃信号的频率和幅度特性，我们提出了不同的机制，可以解释的基本特征的效果。定量地说，我们的研究结果显示出很好的一致性，对于局部地下非均匀性内部调用的正常模式，分析，数值模型和现场实验之间的误差小于5%，并且分析，数值模型和现场实验之间至少85%的一致性。
模型的弯曲模式和现场实验。潜在地，振铃效应可用于浅层地下勘测和地下地形的结构测绘。
We refer to the seismic ringing effect as a dynamic response of a localized shallow heterogeneity in
the ground to an incident wave field originated either from a seismic source operating at the surface
or from a background noise. On the seismograms the seismic ringing wave field usually appears as
a long wave train with a pronounced resonant character concentrated above the localized subsurface
heterogeneity. Based on the theoretical and numeric analysis of the frequency and amplitude characteristics of the ringing signals, we suggest different mechanisms that can explain the underlying features of the effect. Quantitatively, the results of our study show an excellent agreement, with an error less than 5% between analytical, numerical models and field experiments for the invoked normal modes inside the localized subsurface heterogeneity, and at least 85% agreement between the analytical
model for the flexural modes and field experiments. Potentially, the ringing effect may be exploited in shallow subsurface surveys, and structural mapping of subsurface terrain.