One of the most unique properties of a structure set is the spacing between the member elements. Spacings of joints and faults have attracted considerable interest, but the spacing of deformation bands in general remains to be poorly known. Figure 1 includes shear band spacing measurements from six sites in the Entrada Sandstone exposed at the San Rafael Desert, Utah (Aydin, 1977). Here, the sense of shearing is strike-slip for the data in (b) and the rest of the plots are for shear bands with dip-slip sense of shearing, primarily normal type. The largest frequencies fall into 5-30 cm range.

Figure 1. Plots showing shear band spacing distribution at multiple sites (a to f) in the Entrada Sandstone, the San Rafael Desert, Utah. From Aydin (1977).