Figure 7
From: Linear stability of plane Poiseuille flow in an infinite elastic medium and volcanic tremors
Effect of deviation from parabolic basic flow profile on neutrally stable solution. The critical Mach number is plotted as functions of the parameter, δ, calculated for ϱ = 1, β = 1,; and (a) L = 102; (b) L = 103; and (c) L = 104. Black (red) lines indicate the value at S = 10-2 (S = 10-4). Symmetric (antisymmetric) solutions are shown as solid (broken) lines.