Figure 3.-- A, Displacement vectors (relative to the point at 0,0) measured for a grid of stakes spanning a slide-bounding strike-slip fault of the Slumgullion landslide. Small differences in flag positions on the left are caused by measurement error. The grid was located several meters up the landslide from the digital creepmeter (fig. 2). B, Velocity vectors inferred from geodeftic networks spanning the creeping segments of the San Andreas and Calaveras faults (from fig. 6 of Lisowski and others, 1991). The velocities indicate motion relative to the "center of mass" of the network (Lisowski and others, 1991).