| P波偏振层析成像 |
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| 引用本文： | 王怀军,刘福田,陈晓非. P波偏振层析成像[J]. 地球物理学进展, 2000, 15(3): 7-13 |
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| 作者姓名： | 王怀军 刘福田 陈晓非 |
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| 作者单位： | 1. 北京大学地球物理系,北京,100871
2. 中国科学院地质与地球物理研究所,北京,100101 |
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| 基金项目： | 国家自然科学基金项目 !(497940 44,49732 10 0 ),中国科学院‘九五’重大项目!(KZ95 1-A1- 40 1) |
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| 摘 要： | 论述了Ｐ波偏振层析成像方法。这是一个利用Ｐ波远震偏振资料去反演速度结构的方法,与走时层析成像相比,它有几个显著的优点：不受震源定位和发震时刻误差的影响;对深地幔速度结构不敏感而对接收器附近的速度结构和速度梯度最敏感,在这一意义上它与时反演是互补的。如果联合使用走时和偏振资料可以改善层析成像的结果。走时的变化对应于速度的变化,而偏振的变化则与速度梯度的变化相对应,因昆,要确定速度异常的边界,用偏振数
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| 关 键 词： | 反演 走时 P波偏振层折成像 三维数值模拟 实验 |
P-WAVE POLARIZATION TOMOGRAPHY |
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| WANG Huai-jun,LIU Fu-tian,CHEN Xiao-fei. P-WAVE POLARIZATION TOMOGRAPHY[J]. Progress in Geophysics, 2000, 15(3): 7-13 |
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| Authors: | WANG Huai-jun LIU Fu-tian CHEN Xiao-fei |
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| Affiliation: | WANG Huai jun 1 LIU Fu tian 2 CHEN Xiao fei 1 1. Department of Geophysics of Peking University,Beijing 100871,China 2. Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100101,China |
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| Abstract: | P wave polarization tomography is an invesion method that uses teleseismic P wave polarization data to obtain velocity structure. Polarization inversion has some intrinsic advantages over travel time inversion: It is not influenced by source location and origin time errors; it is not sensitive to deep mantle velocity structure but is more sensitive to near station velocity structure. Travel time responds to the velocity variation, while the polarization responds to the velocity gradient variation. The two types of data are complementary to each other in this sense, with polarization data better suited to delineate the edges of the velocity anomalies. Joint inversion of both P wave travel time and polarization direction data can improve the tomographic result. Numerical tests show that the polarization method is correct, numerically accurate, rapidly convergent and stable in the presence of measurement noise. |
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| Keywords: | Inversion Polarization Slowness Tomography |
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