Figure 11: Areas of waxing and
waning basaltic volcanism in the SVF are delineated through application
of the recurrence rate model. Recurrence rate is calculated at 0.25 m.y.
intervals on a grid (grid spacing is 2 km) using m = 7 near-neighbors
and a 0.5 m.y. time window (equation 3). Maps for successive 0.25 m.y.
intervals are differenced to illustrate spatial and temporal change in
recurrence rate. The overall steady-state activity followed by waning volcanism
is punctuated by intense episodes of volcanism that occur locally within
the field. The outline of the SVF is shown in white.
