Figure 4: Scaling relationship that produces flow-stiffness data collapse.
From: Approaching a universal scaling relationship between fracture stiffness and fluid flow

These data demonstrate the collapse of the data shown in Fig. 3a using equation (4) for the weakly correlated, spatially correlated and eroded fractures, for fracture length scales of 0.0625–1 m. The shape of the symbol indicates the fracture length scale: 0.0625 (circles), 0.125 (squares), 0.25 (diamonds), 0.5 (filled inverted triangle) and 1 m (filled triangle).