The observation and results imply that segregation and accumulation of gas in a shallow conduit played a role in increasing excess pressure prior to the vulcanian explosion.
The observation and results imply that segregation and accumulation of gas in a shallow conduit played a role in an increase of excess pressure immediately below the dome surface, prior to the vulcanian explosion.
We numerically simulate volcanic inflation caused by magma ascent in a shallow conduit at volcanoes which repeatedly erupt, in order to understand the effect of volatile behavior on magma from geodetic data.
These inflations are thought to result from pressur-ization processes associated with magma ascent and/or gas flow in the shallow conduit.
During magma fragmentation, the fragments, which are not ejected from the shallow conduit, will sinter, heal, and recover strength.
This reflects the fact that the Vulcanian explosion is accompanied only by the rupture of a high-pressurized area at a shallower part of the conduit and subsequent propagation of a fragmentation wave toward a deeper part (e.g., Turcotte et al. [1990]; Koyaguchi and Mitani [2005]), and not with magma migration from the magma chamber.
These differences are likely to relate to a contribution from the volcanic conduit, where explosive (sub-Plinian) eruptions could have involved a shallow part of the magma chamber plus the conduit, yielding a shallower source depth.
The fine spatial and temporal characteristics of volcanic tremors suggest an interaction between deep and shallow conduits.
Then I scored a groove in a straight line from the hole to the tip of the nib, one on the top and one on the underside, so that it looks like the split metal nib of a fountain pen, but actually they are just shallow conduits for channelling liquid - inquaducts, in fact.
Compared to type 1 phreatic systems, here the conduit is more open with a shallower magma system.
