| 裂隙参数对衰减各向异性影响的数值模拟 |
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| 引用本文： | 蔡晓刚.裂隙参数对衰减各向异性影响的数值模拟[J].中国地震研究,2012,26(1):97-109. |
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| 作者姓名： | 蔡晓刚 |
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| 基金项目： | sponsored by Special Fund for Basic Research of Institute of Geology,CEA(Grant No.DF-IGCEA-0607-1-1);National Natural Science Foundation of China(41104026);the Special Fund for Basic Scientific Research of Institute of Crustal Dynamics,CEA(Grant No.ZDJ2010-01 and ZDJ2009-11) |
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| 摘 要： | Propagation through stress-aligned fluid-filled cracks and other inclusions have been claimed to be the cause of azimuthal anisotropy observed in the crust and upper mantle.This paper examines the behavior of seismic waves attenuation caused by the internal structure of rock mass,and in particular,the internal geometry of the distribution of fluid-filled openings Systematic research on the effect of crack parameters,such as crack density,crack aspect ratio(the ratio of crack thickness to crack diameter),pore fluid properties(particularly pore fluid velocity),VP/VS ratio of the matrix material and seismic wave frequency on attenuation anisotropy has been conducted based on Hudson’s crack theory.The result shows that the crack density,aspect ratio,material filler,seismic wave frequency,and P-wave and shear wave velocity in the background of rock mass,and especially frequency has great effect on attenuation curves.Numerical research can help us know the effect of crack parameters and is a good supplement for laboratory modeling.However,attenuation is less well understood because of the great sensitivity of attenuation to details of the internal geometry.Some small changes in the characteristics of pore fluid viscosity,pore fluids containing gas and liquid phases and pore fluids containing clay can each alter attenuation coefficients by orders of magnitude.Some parameters controlling attenuation are therefore necessary to make reasonable estimations,and anisotropic attenuation is worth studying further.
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| 关 键 词： | Equivalent media theory Crack density Attenuation anisotropy Quality factor |
| 收稿时间： | 4/2/2011 12:00:00 AM |
| 修稿时间： | 7/1/2011 12:00:00 AM |
Numerical Modeling of the Effect of Crack Parameters on Attenuation Anisotropy |
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| Cai Xiaogang.Numerical Modeling of the Effect of Crack Parameters on Attenuation Anisotropy[J].Earthquake Research in China,2012,26(1):97-109. |
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| Authors: | Cai Xiaogang |
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| Institution: | Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085 , China |
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| Abstract: | Propagation through stress-aligned fluid-filled cracks and other inclusions have been claimed to be the cause of azimuthal anisotropy observed in the crust and upper mantle. This paper examines the behavior of seismic waves attenuation caused by the internal structure of rock mass, and in particular, the internal geometry of the distribution of fluid-filled openings Systematic research on the effect of crack parameters, such as crack density, crack aspect ratio (the ratio of crack thickness to crack diameter) , pore fluid properties ( particularly pore fluid velocity), VP/VS ratio of the matrix material and seismic wave frequency on attenuation anisotropy has been conducted based on Hudson's crack theory. The result shows that the crack density, aspect ratio, material filler, seismic wave frequency, and P-wave and shear wave velocity in the background of rock mass, and especially frequency has great effect on attenuation curves. Numerical research can help us know the effect of crack parameters and is a good supplement for laboratory modeling. However, attenuation is less well understood because of the great sensitivity of attenuation to details of the internal geometry. Some small changes in the characteristics of pore fluid viscosity, pore fluids containing gas and liquid phases and pore fluids containing clay can each alter attenuation coefficients by orders of magnitude. Some parameters controlling attenuation are therefore necessary to make reasonable estimations, and anisotropic attenuation is worth studying further. |
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| Keywords: | Equivalent media theory Crack density Attenuation anisotropy Quality factor |
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