弹性波正演模拟中PML吸收边界条件的改进

秦臻; 任培罡; 姚姚; 张才

Volume 34 Issue 4

Jul. 2009

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QIN Zhen, REN Pei-gang, YAO Yao, ZHANG Cai, 2009. Improvement of PML Absorbing Boundary Conditions in Elastic Wave Forward Modeling. Earth Science, 34(4): 658-664.

Citation:

QIN Zhen, REN Pei-gang, YAO Yao, ZHANG Cai, 2009. Improvement of PML Absorbing Boundary Conditions in Elastic Wave Forward Modeling. Earth Science, 34(4): 658-664.

QIN Zhen, REN Pei-gang, YAO Yao, ZHANG Cai, 2009. Improvement of PML Absorbing Boundary Conditions in Elastic Wave Forward Modeling. Earth Science, 34(4): 658-664.

Citation:

QIN Zhen, REN Pei-gang, YAO Yao, ZHANG Cai, 2009. Improvement of PML Absorbing Boundary Conditions in Elastic Wave Forward Modeling. Earth Science, 34(4): 658-664.

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Improvement of PML Absorbing Boundary Conditions in Elastic Wave Forward Modeling

QIN Zhen^{1, 3
,},
REN Pei-gang²,
YAO Yao¹,
ZHANG Cai³

1.
Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, ChinaUniversity of Geosciences, Wuhan 430074, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

Received Date: 2008-08-28
Publish Date: 2009-07-25

Abstract

Abstract

In finite-difference time-domain modeling of elastic waves, absorbing boundary conditions are used to mitigate undesired reflections from the model's truncation boundaries.The perfectly matched layer (PML) is generally acknowledged as the best available absorbing boundary condition and very efficient to absorb both body waves and surface waves.The classical splitting PML (SPML) has some disadvantages: it needs much computer memory and has complex programming process.And the conventional non-splitting PML (NPML) based on time convolution needs more auxiliary equations or fields and computing time.We have induced a simple and efficient NPML based on non-convolution technology in this paper.The NPML we induced does not have to split the velocity and stress fields and also doesn't need to involve in complex convolution in time domain.The analysis result shows the new PML method not only has perfect absorbing performance, but also has simple computing equations, easier programming and less memory consumption.
- perfectly matched layer,
- absorbing boundaries,
- elastic wave,
- forward modeling,
- geophysics

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References

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