Figure 2: Weighted centroid cluster analysis of volcano distribution in the YMR, calculated using data set 1 [Table 1] and volcanoes less than 5 Ma.Vent pairs group at distances of less than 2 km, clusters are completely formed at linkage distances of 15 km or less, and clusters begin to group at distances of greater than 23 km. Volcano abbreviations are given in Table 1.