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Brennan 1980
Brennan, B.J. (1980). Pulse propagation in media with frequency-dependent Q. Geophysical Research Letters 7: doi: 10.1029/GL007i003p00211. issn: 0094-8276.

Recent publication have indicated that a significant dependence of the quality factor Q on frequency may occur in the interior of the earth, and thus an analysis of pulse propagation in media with Q dependent on frequency is appropriate. It is shown that a simple scaling law describes the degradation of an initially sharp pulse as it propagates in a linear viscoelastic medium in which Q has a power-law dependence variation of the pulse rise time with path, as this parameter may be useful in estimating the Q structure of the earth.

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Geophysical Research Letters
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American Geophysical Union
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