## Comment to "qS-waves in a vicinity of the axis
of symmetry of homogeneous transversely isotropic
media", by M. Popov, G.F. Passos, and M.A. Botelho
[Wave Motion 42 (2005) 191-201]

**Vaclav Vavrycuk**
### Summary

A new asymptotic formula for S waves propagating near the symmetry
axis in transversely isotropic elastic media derived by Popov et al.
[Wave Motion 42 (2005) 191-201] is discussed and commented. It is
shown that the formula is a modification of the previously published
formula by Vavrycuk [Geophys. J. Int. 138 (1999) 581-589]. The
formula of Popov et al. (2005) is less accurate and valid under more
restrictive conditions than that of Vavrycuk (1999).

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In: Seismic Waves in Complex 3-D Structures, Report 16,
pp. 145-153, Dep. Geophys., Charles Univ., Prague, 2006.

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