Figure 3: Recurrence rate for the formation of new volcanoes in the YMR is estimated using method 1 [equations 4 and 12], calculated using data from Table 1. Solid triangles - data set 1, open triangles - data set 2. These data sets are further subdivided and calculations repeated for all volcanoes (< 10 Ma), volcanoes less than 5 Ma and volcanoes less than 2 Ma.