FIGURE 1.7. - Individual branches and strands of surface trace of the San Andreas fault are arranged in various patterns: A-C, left-stepping echelon arrangement; D-F, right-stepping echelon arrangement; G, both left- and right-stepping arrangements; H-J, complex arrangements of individual strands. Note that individual strands may be at an angle of as much as 12° to general trend of fault zone. Sources: A, D (Ross, 1969); B (Hope, 1969; see references in this chapter); c, J (Brown and Wolfe, 1972); E, H, I (Vedder and Wallace, 1970); F, G (Brown, 1970; see references in chap. 2).