Figure 3
Simplified shallow volcanic conduit showing our model for Strombolian eruptions. (a,b) Simplified illustration of the volcanic conduit showing channel flow, a slug and a particle plug as well as the cycle of slug growth, plug weakening, slug bursting and plug reformation, as discussed in text. (c) The length of the particle plug, L, is plotted as a function of the gas overpressure, ΔP for a vent radius, r, equal to 10 and 5 m. (d) The relation between the gas flux, Q, and ΔP. For a given gas flux, the dynamic overpressure is smaller for a magma with larger value of the lubrication layer dh or lower viscosity (grey line).
