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首页> 外文期刊>The Journal of the Acoustical Society of America >Dispersion of interface waves in sediments with power-law shear speed profiles. II. Experimental observations and seismo-acoustic inversions
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Dispersion of interface waves in sediments with power-law shear speed profiles. II. Experimental observations and seismo-acoustic inversions

机译：界面波在具有幂律切变速度剖面的沉积物中的弥散。二。实验观察和地震声反演

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The propagation of seismic interface waves is investigated in soft marine sediments in which the density is constant, the shear modulus is small, and the profile of shear speed c_s versus depth z is of the power-law form c_s(z) = c_0z~v, in which c_0 and v are constants (0 < v < 1). Both the phase speed V and the group speed U of interface waves scale with frequency as f~(v/(v-1)) and they obey the simple relation U = (1 - v)V. These relations are derived in a simple way using ray theory and the WKB method; a companion paper [O. A. Godin and D. M. F. Chapman, J. Acoust. Soc. Am. 110, 1890 (2001)] rigorously derives the same result from the solutions to the equations of motion. The frequency scaling is shown to exist in experimental data sets of interface wave phase speed and group speed. Approximate analytical formulas for the dispersion relations (phase and group speed versus frequency) enable direct inversion of the profile parameters c_0 and v from the experimental data. In cases for which there is multi-mode dispersion data, the water-sediment density ratio can be determined as well. The theory applies to vertically polarized (P-SV) modes as well as to horizontally polarized (SH) modes (that is, Love waves).
机译：研究了在密度恒定，剪切模量较小，剪切速度c_s与深度z的关系为幂律形式c_s（z）= c_0z〜v的软海沉积物中地震界面波的传播情况。 ，其中c_0和v是常数（0

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