Physical parameters
(3): classification with gas content
Annular : 70 % + : downward liquid flow
70 % ++ : upward liquid flow
Dispersed: 70 %
++ : entirely upwards
Hawaiian
fire fountain: drainage during fountaining
Annular
flow
Plinian column: dispersed flow
Gas volume fractions for
transition of regimes are unknown and depend
strongly on magma viscosity; but roughly transition to slug: 10
- 60 %