Figure 4: Estimated probability of disruption of the HLW repository, calculated using method 1, varies with the number of near neighbors used in the nonhomogeneous model. Calculations are made for the probability of a volcano forming within an 8 km² block at the Yucca Mountain repository site (Figure 1), during the next 10,000 years, using data set 1 (solid triangles) and data set 2 (open triangles).