The conditions of pumice generation in Plinian eruptions are studied. A physical model
describes the behavior of gas bubbles in a magma fragment which is carried upward in a …

We develop a physical framework for the evolution of vesicular magma fragments after their
formation by fragmentation in explosive eruptions. These fragments are carried by a …

The ratio of the volume of vesicles (gas) to that of glass (liquid) in pumice clasts (VG/VL)
reflects the degassing and dynamic history experienced by a magma during an explosive …

We have coupled three independent methods to investigate the time evolution of eruptive
intensity during the sub-Plinian and Plinian phases of the 3600-year BP Late Bronze-Age …

Fragmentation, or the" coming apart" of magma during a plinian eruption, remains one of the
least understood processes in volcanology, although assumptions about the timing and …

This chapter provides a critical overview of syn-eruptive processes between magma
chamber and vent in magmatic, sustained, Plinian-type eruptions. Phreatomagmatic effects …

This paper outlines methods for determining a bubble size distribution (BSD) and the
moments of the BSD function in vesiculated clasts produced by volcanic eruptions. It reports …

We examine the physics of growth of water bubbles in highly viscous melts. During the initial
stages, diffusive mass transfer of water into the bubble keeps the internal pressure in the …

CO2 is relatively insoluble in basaltic magma at low crustal pressures. It therefore exists as a
gas phase in the form of bubbles in shallow crustal reservoirs. Over time these bubbles may …

The effect of crystals and pre-existing gas phases on the dynamic degassing and
fragmentation of magmas in a volcanic conduit have been simulated by analogue …