Analysing the Topographic Form of Stratovolcanoes: Datasets and Supplementary Materials
We study the topographic shape of isolated stratovolcanoes around the world by formulating an ideal mathematical form based on the constructional piling of eruptive products that fits the quintessential stratovolcano shape. For cases when the edifice is more protuberant than our ideal form, we consider this to be the effect of uplift at the surface from a statistical distribution of dykes emanating from a magma reservoir, which cause displacement at the surface. Our aim is to estimate the relative contribution of these dyke intrusions on the height and shape of a volcanic edifice compared to the contribution due to the constructional piling up of eruptive products. Such insight might be useful in guiding field research, or to gain more understanding of the internal processes affecting volcanoes where data is more difficult to obtain. We classify our volcanoes into four categories: (1) those with an axisymmetric good fit to the functional form, (2) those with a non-axisymmetric good fit to the functional form, (3) those with protuberant deviations in all quadrants, and (4) those with protuberant deviations in one or two quadrants. The data presented here gives the parameters of best fit to the ideal form for volcanoes in all categories, figures of the best fits for those in categories (1) and (2), and the parameters of the stochastic dyke model of best fit for those in categories (3) and (4).