Figure 4. Relationships among various parameter values at Site 1. (a) Averaged maximum acceleration versus the number of starting points of boulder falls with the best-fit linear relation (red line). (b) Density of small craters versus mean slope angle. (c) Density of small craters versus averaged OMAT value. (d) Mean slope angle versus averaged OMAT value. Parameters were calculated within grids with dimensions of 600 m × 600 m in (a), about 450 m × 450 m in (b) and (c), and 230 m × 230 m in (d). Red diamonds and associated error bars in (b) and (c) show the average and standard deviation of the density of small craters in individual 2º slope angle bins and 0.02 OMAT bins, respectively.