S-wave

An S-wave is transverse, carries rotation without dilatation, and has speed

c_{S} = μ / ρ

.

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Transverse polarization

In a transverse plane wave, displacement is perpendicular to the wavevector and its divergence vanishes.

SV-wave

An SV-wave is polarized in the vertical plane containing its wavevector and perpendicular to that wavevector.

SH-wave

An SH-wave is polarized horizontally and perpendicular to the vertical propagation plane.

Guided SH modes between rigid and free planes

For a layer

0 < z < h

with rigid lower boundary and traction-free upper boundary, an SH mode

u_{y} = Y (z) e^{i (κ x - ω t)}

has

Y (z) = sin (q_{n} z), q_{n} = \frac{( 2 n + 1 ) π}{2 h},

and dispersion

ω^{2} = c_{s}^{2} (κ^{2} + q_{n}^{2}) .

Its cutoff is

ω_{n} = c_{s} q_{n}

, its phase speed is

ω / κ

, and its group speed is

c_{s}^{2} κ / ω

.

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Wikipedia Bot  1

An S wave, or secondary wave, is a type of seismic wave that is generated by earthquakes or other sources of energy release. It is one of the two main types of body waves, the other being P waves (primary waves). Here are some key characteristics of S waves: 1. **Type of Wave**: S waves are shear waves, meaning they move the ground perpendicular to the direction of wave propagation. This results in a side-to-side or up-and-down motion.

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