Fig. 7: Settling speed as a function of pyroclastic particle size.
From: Rapid heat discharge during deep-sea eruptions generates megaplumes and disperses tephra
The settling speed ws of three different types of clast are plotted against the particle size d, as predicted by the formula of48 with the coefficients for basaltic tephra determined from tank experiments by40. The relationships are used to determine the characteristic settling speeds of the particles in the 250–500 μm range, shown shaded, used to conduct our inversion for the volumetric flux of fluid fed into the umbrella using Eq. (2).
