Earth-prints repository, logo   DSpace

About DSpace Software
|earth-prints home page | roma library | bologna library | catania library | milano library | napoli library | palermo library
Please use this identifier to cite or link to this item:

Authors: Diller, K.*
Clarke, A.*
Voight, B.*
Neri, A.*
Title: Mechanisms of conduit plug formation: implications for Vulcanian explosions.
Title of journal: Geophys. Res. Lett.
Series/Report no.: /33 (2006)
Publisher: Agu
Issue Date: 2006
DOI: 10.1029/2006GL027391
Keywords: physical mechanisms
Abstract: We explore physical mechanisms controlling formation of a confining conduit plug using 1D, steady-state numerical models of magma ascent. Model results for the welldocumented 1997 Vulcanian explosions at Soufrie`re Hills volcano were compared against subsurface conditions constrained by geophysical and petrologic analysis. We suggest that, if magma is permeable and overpressured and rock surrounding the conduit is permeable, degassing occurs both vertically and through conduit walls. This outgassing creates a region of low-vesicularity, dense magma near the surface (magma plug) which eventually seals the conduit and promotes system overpressure. Driving pressure increases with increasing magma flow rate, hindering volatile exsolution and shifting open-system degassing to shallower levels of the conduit. As a result, increasing magma flow rate for a fixed conduit width creates a vertically thinner plug and increases the magnitude and vertical extent of conduit overpressure. Plug thickness and density are also controlled by magma and edifice permeability
Appears in Collections:04.08.99. General or miscellaneous
04.08.03. Magmas
05.05.99. General or miscellaneous
Papers Published / Papers in press

Files in This Item:

File SizeFormatVisibility
853.pdf235.33 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Share this record




Stumble it!



Valid XHTML 1.0! ICT Support, development & maintenance are provided by CINECA. Powered on DSpace Software. CINECA