Translations:Dictionary:Group velocity/4/en

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FIG. D-16. Dispersion. (a) Change in wavelet shape because of dispersion in a Voigt solid. Amplitudes have been normalized. (b) Change of waveshape because of energy shifting to later cycles. The axes of time and offset could be interchanged on either graph. (From Balch and Smolka, 1970.)[1]
  1. Balch, A. H. and Smolka, F. R., 1970, Plane and spherical Voigt waves: Geophysics, 35, 745–761.