| Construction of constant-Q viscoelastic model 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，College of Georesources and Information，China University of Petroleum，Dongying 257061，China，Dongying 257061，China |
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| 基金项目： | Shandong Foundation for Talent Young Scientists (02BS123) |
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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 illus-trated through the change of frequency spectra and waveform in several different viscoelastic models.
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Construction of constant-Q viscoelastic model with three parameters |
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| SUN Cheng-yu YIN Xing-yao College of Georesources and Information,China University of Petroleum,Dongying ,China.Construction of constant-Q viscoelastic model with three parameters[J].Acta Seismologica Sinica(English Edition),2007(4). |
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| Authors: | SUN Cheng-yu YIN Xing-yao College of Georesources and Information China University of Petroleum Dongying China |
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| Institution: | SUN Cheng-yu YIN Xing-yao 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 illus-trated through the change of frequency spectra and waveform in several different viscoelastic models. |
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| Keywords: | viscoelastic medium quality factor theoretical model seismic wave |
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