Figure 8: Density of mapped volcanic
events in the SVF: (a) 1.75 to 1.5 Ma, (b) 1. 5 to 1.25 Ma, (c) 1.25 to
1.0 Ma, and (d)1.0 to 0.75 Ma, based on mean estimated ages of vents and
lava flows and using an Epanechnikov kernel (h = 5 km). Vents are
plotted by basalt type: open circle - tholeiite, solid circle - transitional
basalt, open square - alkali-olivine basalt and hawaiite, solid square
- mugearite and benmoreite, and pentagram - no analysis. Contour interval
is 0.05 volcanic events/km2. All vents are included in the density
estimate, including those without geochemical analyses. Map extent of lava
flows shown in gray.
