Figure 3.

The effect of tensile modulus ζ and propagation direction θ on the a) slow c_s and b) fast c_f shear speeds is shown (μ = ρ = ϕ = 1 and κ → ∞). The tensile modulus increases along a radius from the origin with an angle θ from the θ = 0 axis. An increase in ζ increases c_f, but has no effect on c_s. The effects of ζ and bulk modulus κ on the c) fast shear speed and d) pressure wave speed c_p are shown (μ = ρ = ϕ = 1 and θ = 135°). The fast shear speed approaches a constant value for finite κ.