# Shear Wave

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## shear wave

[′shir ‚wāv] (geophysics)

(mechanics)

A wave that causes an element of an elastic medium to change its shape without changing its volume. Also known as rotational wave.

## Shear Wave

a transverse elastic wave in a solid. In a shear wave, the particle motion is perpendicular to the direction of propagation of the wave, and the propagated disturbance is a shearing strain. The phase velocity of a shear wave is equal to where G is the shear modulus of the material and ρ is the density of the material. For most solids, the velocity is between 1.7 × 10^{5} and 3.5 × 10^{5} cm/sec. In anisotropic solids (crystals), shear waves can propagate only in certain directions, and their phase velocity depends on the direction. At hypersonic frequencies of ~10^{9} hertz or higher, shear waves can also exist in a fluid, because fluids exhibit a shear modulus in this frequency range.

### REFERENCES

Landau, L. D., and E. M. Lifshits.*Teoriia uprogosti*, 3rd ed. Moscow, 1965. Chapter 3, subsecs. 22 and 23. (

*Teoreticheskaia fizika*, vol. 7.)

Kolsky, H.

*Volny napriazheniia ν tverdykh lelakh*, part 1, Moscow, 1955.

Part 1. Chapter2, subsecs. l–4. (Translated from English.)