Fig. 3: Sensitivity to source geometry.
From: The radius of the umbrella cloud helps characterize large explosive volcanic eruptions
The difference in thinning of the deposit with radial distance from the vent simulated with a point source, line source, and disk source. The vertical line represents the location of the disk edge (radius). The simulated parameters include mass (M) 2.5 × 1011 kg, column height (H) 25 km, disk radius (R) 10 km, and diffusion coefficient (K) 9500 m2 s−1. The RMSE and the χ2—criterion for the goodness of fit indicate that a better fit of the deposit is obtained by modeling with a disk source, primarily because of better fit at R < 10 km.
