| Construction of constant-Q viscoelastic mode with three parameters |
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| 作者姓名： | 孙成禹 印兴耀 |
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| 作者单位： | College of Georesources and Information, China University of Petroleum, Dongying 257061, China |
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| 基金项目： | Shandong Foundation for Talent Young Scientists （02BS 123） |
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| 摘 要： | The popularly used viscoelastic models have some shortcomings in describing relationship between quality factor （Q） and frequency, which is not consistent with the observation data. Based on the theory of viscoelasticity, a new approach to construct constant-Q viscoelastic model in given frequency band with three parameters is developed. The designed model describes the frequency-independence feature of quality factor very well, and the effect of viscoelasticity on seismic wave field can be studied relatively accurate in theory with this model. Furthermore, the number of required parameters in this model has been reduced fewer than that of other constant-Q models, this can simplify the solution of the viscoelastic problems to some extent. At last, the accuracy and application range have been analyzed through numerical tests. The effect of viscoelasticity on wave propagation has been briefly illustrated through the change of frequency spectra and waveform in several different viscoelastic models.
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| 关 键 词： | 黏弹性介质 品质因素 地震波 理论模型 |
| 文章编号： | 1000-9116（2007）04-0370-11 |
| 收稿时间： | 26 January 2007 |
| 修稿时间： | 2007-01-26 |
Construction of constant- Q viscoelastic model with three parameters |
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| Sun Cheng-yu,and Yin Xing-yao.Construction of constant-Q viscoelastic mode with three parameters[J].Acta Seismologica Sinica(English Edition),2007,20(4):370-380. |
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| Authors: | Sun Cheng-yu and Yin Xing-yao |
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| Institution: | College of Georesources and Information, China University of Petroleum, Dongying 257061, China |
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| Abstract: | The popularly used viscoelastic models have some shortcomings in describing relationship between quality factor (Q) and frequency, which is not consistent with the observation data. Based on the theory of viscoelasticity, a new approach
to construct constant-Q viscoelastic model in given frequency band with three parameters is developed. The designed model describes the frequency-independence
feature of quality factor very well, and the effect of viscoelasticity on seismic wave field can be studied relatively accurate
in theory with this model. Furthermore, the number of required parameters in this model has been reduced fewer than that of
other constant-Q models, this can simplify the solution of the viscoelastic problems to some extent. At last, the accuracy and application
range have been analyzed through numerical tests. The effect of viscoelasticity on wave propagation has been briefly illustrated
through the change of frequency spectra and waveform in several different viscoelastic models.
Foundation item: Shandong Foundation for Talent Young Scientists (02BS123) |
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| Keywords: | viscoelastic medium quality factor theoretical model seismic wave |
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