| 各向异性介质中扭转波分裂的实验观测 |
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| 引用本文： | 魏建新,狄帮让,王椿镛.各向异性介质中扭转波分裂的实验观测[J].地球物理学进展,2006,21(2):535-540. |
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| 作者姓名： | 魏建新 狄帮让 王椿镛 |
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| 作者单位： | (1.石油大学CNPC物探重点实验，北京 100083； 2.中国地震局地球物理研究所，北京100081) |
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| 基金项目： | CNPC重点实验室基金 |
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| 摘 要： | 实验室可以产生两种振动模式的横波，一种是剪切振动，另一种是扭转振动，在各向同性介质中两模式的横波速度是相同的，但它们的振动特性不一样，前者表现出很强的偏振特性，后者为无偏振特性.实验测试表明无偏振特性的扭转波在各向异性介质中传播时也会出现两种速度不同的扭转波，速度值与剪切横波的快慢横波速度值一致.用扭转波换能器接收时，这快慢扭转波的波形振幅不受各向异性方位影响.通过两块均匀的各向异性样品，用实验观测揭示了各向异性介质中扭转波的一些传播特征.
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| 关 键 词： | 各向异性 剪切横波 扭转波 扭转波分裂 实验观测 |
| 文章编号： | 1004-2903（2006）02-0535-06 |
| 收稿时间： | 2005-09-10 |
| 修稿时间： | 2005-11-20 |
Experiment observation of torsion wave splitting in anisotropic medium |
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| WEI Jian-xin,DI Bang-rang,WANG Chun-Yong.Experiment observation of torsion wave splitting in anisotropic medium[J].Progress in Geophysics,2006,21(2):535-540. |
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| Authors: | WEI Jian-xin DI Bang-rang WANG Chun-Yong |
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| Institution: | 1. Key laboratory of geophysical exploration, CNPC;University of petroleum, Beijing 100083, China ; 2. Institute of geophysics, China Seismology Bureau, Beijing 100081, China |
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| Abstract: | Shear wave of two vibration mode can be produced in laboratories: the shear vibration and the torsion vibration.In isotropic medium the wave velocity of these two types of wave is identical;however,their vibration characteristics are different.The former exhibits strong polarization characteristic while the latter has no polarization characteristic.Experiment tests indicate that two types of torsion wave with different velocity appear when the torsion wave without polarization characteristic propagates in anisotropic medium,and the velocities are consistent with those of the fast and slow shear wave which are produces when the shear vibration wave is tested.When these two types of torsion wave are received by torsion wave receivers,their phase is not effected by the anisotropic azimuth.Through observation with two homogeneous anisotropic samples,we uncover some propagation characteristics of the torsion wave in anisotropic medium. |
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| Keywords: | anisotropy shear-wave torsion-wave torsion -wave splitting experiment observation |
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