| 井下地震计的P波接收函数正演计算及其稳定性研究——以首都圈地区为例 |
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| 引用本文： | 郑德高,倪四道,杨卓欣,刘志.井下地震计的P波接收函数正演计算及其稳定性研究——以首都圈地区为例[J].地球物理学报,2018,61(10):3964-3979. |
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| 作者姓名： | 郑德高 倪四道 杨卓欣 刘志 |
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| 作者单位： | 1. 中国科学技术大学地球和空间科学学院蒙城地球物理国家野外科学观测研究站, 合肥 230026;2. 中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室, 武汉 430077;3. 中国地震局地球物理勘探中心, 郑州 450002 |
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| 基金项目： | 湖北省自然科学基金计划项目资助（2014CFA005）资助. |
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| 摘 要： | 井下地震计波形记录的P波垂向分量存在频谱极小（spectrum null）现象，导致接收函数的结果不稳定.本文以首都圈地区为例，基于平面波入射的传播矩阵理论，发展了用于计算井下地震计的接收函数正演方法.在此基础上，分析了井下地震计波形垂向分量频谱极小现象，研究其对接收函数稳定性的影响.结果表明，井下地震计波形记录垂向分量的频谱极小开始出现的频率和地震计的埋深相关.该现象可造成反卷积提取的接收函数不稳定，且不稳定情况出现在频谱极小附近的频段，可通过选择合适的高斯因子压制其对接收函数的影响.
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| 关 键 词： | 井下地震计 接收函数 频谱极小 首都圈 |
| 收稿时间： | 2018-01-16 |
Stability of receiver function from borehole seismometer from forward modeling and case study of waveform data in China Capital Region |
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| ZHENG DeGao,NI SiDao,YANG ZhuoXin,LIU Zhi.Stability of receiver function from borehole seismometer from forward modeling and case study of waveform data in China Capital Region[J].Chinese Journal of Geophysics,2018,61(10):3964-3979. |
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| Authors: | ZHENG DeGao NI SiDao YANG ZhuoXin LIU Zhi |
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| Institution: | 1. Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2. State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;3. Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China |
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| Abstract: | The vertical component P waves recorded by borehole seismometers features the phenomenon of spectrum null, which makes the receiver function unstable. Taking China Capital region as an example, we develop a method to forward modeling receiver functions based on the propagation matrix theory. We analyze the phenomenon of spectrum null on vertical component waveforms and study its influence on the stability of retrieving receiver functions. The result shows that the spectrum null of vertical component waveforms recorded at borehole seismometers is related to the burial depth of the seismometer. This phenomenon leads to the instability of receiver functions retrieved via deconvolution method, and this instability occurs near the period of spectrum null. A suitable Gaussian factor can be selected to reduce the influence of spectrum null when applying the deconvolution method. |
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| Keywords: | Borehole seismometer Receiver function Spectrum null China Capital Region |
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