| Rayleigh波勘探中“之”字形频散曲线“起跳点”频率研究 |
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| 引用本文： | 刘雪峰,凡友华.Rayleigh波勘探中“之”字形频散曲线“起跳点”频率研究[J].地球物理学报,2011,54(8):2124-2135. |
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| 作者姓名： | 刘雪峰 凡友华 |
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| 作者单位： | 哈尔滨工业大学深圳研究生院基础科学学科部,深圳 518055 |
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| 基金项目： | 国家自然科学基金项目(40604012)资助. |
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| 摘 要： | 当层状介质中存在低速层的时候,实际提取到的Rayleigh波频散曲线往往会发生“之”字形回折.已有研究表明,“之”字形回折与各模式的激发能量有关.特别的,“之”字形回折的“起跳点”(发生“之”字形回折的点)与介质参数有一定关系,因此在应用中它反映了介质的一些特征.但是,这一关系是怎样的还没有人进行详细研究.本文计算了三...
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| 关 键 词： | Rayleigh波 “之”字形频散曲线 低速层 |
| 收稿时间： | 2010-12-23 |
A study on ‘jump point’ frequencies of zigzag dispersion curves in Rayleigh wave exploration |
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| LIU Xue-Feng,FAN You-Hua.A study on ‘jump point’ frequencies of zigzag dispersion curves in Rayleigh wave exploration[J].Chinese Journal of Geophysics,2011,54(8):2124-2135. |
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| Authors: | LIU Xue-Feng FAN You-Hua |
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| Institution: | Department of Mathematics and Natural Science, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055,China |
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| Abstract: | Zigzag dispersion curves are sometimes found in Rayleigh wave exploration when the media contain low velocity layers. The zigzag dispersion curves are believed to have a relationship with low velocity layers. Especially, there is a relationship between ‘jump point’ frequencies of zigzag dispersion curves and the parameters of the media. So the ‘jump point’ frequencies can be seen as a characteristic of the media. However, the relationship has not yet been deeply studied. In this paper, a detailed research on it is conducted by computing the variation of the ‘jump point’ frequencies with the media parameters under three different sources. It is found that although the ‘jump point’ frequencies depend on the source type, there are the same rules for various sources: the S-wave velocities of the low velocity layer and the layer above it have the dominant influence on the ‘jump point’ frequencies, and followed by their thickness; the other parameters have less effect on the ‘jump point’ frequencies; the frequencies reduce with the decrease of S-wave velocity of the low velocity layer and the increase of S-wave velocity of the layer above the low velocity layer; they reduce with the increase of the thickness or depth of the low velocity layer. The result can be used as a qualitative analysis of low velocity layer in the cases like compaction test of subgrade. |
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| Keywords: | Rayleigh wave Zigzag dispersion curves Low velocity layer |
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