| 浅层有限频率面波成像中的3D灵敏度核分析 |
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| 引用本文： | 鲁来玉,丁志峰,何正勤.浅层有限频率面波成像中的3D灵敏度核分析[J].地球物理学报,2011,54(1):55-66. |
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| 作者姓名： | 鲁来玉 丁志峰 何正勤 |
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| 作者单位： | 中国地震局地球物理研究所,北京 100081 |
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| 摘 要： | 本文利用面波散射的模式耦合方法,基于波恩近似和远场假设,研究了有限频率面波三维灵敏度核,针对面波在工程应用中常遇到的水平分层的背景介质模型,计算了介质扰动引起的面波相位和幅度扰动的三维灵敏度核,分析了模式耦合对三维灵敏度核的影响.结果表明,仅考虑模式自身耦合的JWKB近似,介质密度和波速扰动引起的三维灵敏度核可以蜕化为...
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| 关 键 词： | 有限频率 面波 灵敏度核 模式耦合 |
| 收稿时间： | 2010-06-25 |
Analysis of 3D sensitivity kernels of the finite frequency surface wave tomography in shallow subsurface |
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| LU Lai-Yu,DING Zhi-Feng,HE Zheng-Qin.Analysis of 3D sensitivity kernels of the finite frequency surface wave tomography in shallow subsurface[J].Chinese Journal of Geophysics,2011,54(1):55-66. |
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| Authors: | LU Lai-Yu DING Zhi-Feng HE Zheng-Qin |
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| Institution: | Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | In this paper, finite frequency 3D sensitivity kernel is studied using the mode coupling method under the assumption of far field and Born approximation. For the horizontal layered reference media, which is always encountered in the application of Rayleigh waves in geotechnical engineering, 3D sensitivity kernel of the perturbed surface wave amplitude and phase caused by the perturbation of the shear wave velocity is computed. The effects of the mode coupling on the kernel are investigated. Studies show that under the JWKB approximation the 3D sensitivity kernel of the perturbed density and wave velocity is reduced to the 2D sensitivity kernel of the perturbed surface wave phase velocity. That means in the first step for the pure path averaged inversion the finite frequency surface wave tomography is similar to the traditional one based on ray theory, just replacing the 1D sensitivity with 2D sensitivity kernel. If the cross-mode coupling is significant, however, the traditional two-step method breaks down and the shear wave velocity should be directly inverted by introducing the 3D sensitivity kernel in finite frequency surface wave tomography. |
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| Keywords: | Finite frequency Surface wave Sensitivity kernel Mode coupling |
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