Figure 6.

Wave propagation in a cube specimen of aligned fibrin with dominant fiber direction at 45° from horizontal (Figures 1(b,c)), illustrating analysis by directional filtering. (a) Excitation (600 Hz) in the m_f direction (with a component along the fibers, as in Figure 1(b)) leads to predominantly downward-propagating fast shear waves. (b) Excitation (600 Hz) in the m_s direction, perpendicular to the fibers, as in Figure 1(c), leads to predominantly downward-propagating slow shear waves. Panels (c,d): Directionally filtered waves in the [0 −1 0] direction corresponding to panels (a,b) respectively.