Abstract
A seismic station was operated on the island of Stromboli during 1983-1984. More than 100,000 volcanic “Strombolian” eruptions were recorded. Histograms of interval times between successive eruptions and the associated seismic amplitudes are given. The shape of the histograms is correlated with the visually observed crater activity. Histograms of inter-eruption times Δt approach normality when a logarithmic transformation is applied: $$ \log (\Delta t + a) $$ The additive term a appears to be associated with the strength of volcanic activity. No significant periodicities at the 95% level can be found in the eruption sequences. The observations are compared with studies from fluid mechanics, and an eruption model is discussed in which the turbulent boundary layer of the uppermost part of the magma conduit gives rise to randomly occurring velocity “bursts” in the magma flow which trigger the eruptions.Sketch maps of the crater terrace are presented.
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