Fig. 8

Contour maps of the fitting function f [Eqs. (1)–(4)] in 10⁴ for the parameter spaces of a dike depth and opening, b dike length and width, c dike length and opening and d dike width and opening. Dots represent the optimal points (f = 2.9 × 10⁴), and the 95 % confidence intervals estimated from an F test (Árnadóttir and Segall 1994) are the range of f ≤ 3.2 × 10⁴