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Focusing of eruptions by fracture wall erosion
Danish Lithosphere Centre.
Yale University.
2001 (engelsk)Inngår i: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 28, nr 9, s. 1823-1826Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Lithospheric flexural stresses beneath volcanic loads are horizontally strongly compressive towards the top of the lithosphere. Thus, while magma transport through the brittle lithosphere occurs via fractures, the fracture paths under the volcanic center are predicted by stress trajectories to be horizontal and thus unable to supply melt to the volcanic edifice where eruptions are observed. Moreover, the magnitude of the compressive stresses under large loads would close down any vertical magma paths. Both problems may be resolved by additional stresses due to melting or thermomechanical erosion of fracture walls developing over the life-span of the volcano. Fractures form and close frequently in the seismogenic zone of the lithosphere, with each fracture eroding away a small amount of material. The total amount of material removed makes the stress field more tensile, thereby facilitating the long-lived and vertically oriented magma pathways necessary to build discrete volcanic structures.

sted, utgiver, år, opplag, sider
2001. Vol. 28, nr 9, s. 1823-1826
HSV kategori
Forskningsprogram
Geofysik med inriktning mot fasta jordens fysik
Identifikatorer
URN: urn:nbn:se:uu:diva-162530DOI: 10.1029/2000GL011885OAI: oai:DiVA.org:uu-162530DiVA, id: diva2:460656
Tilgjengelig fra: 2011-11-30 Laget: 2011-11-30 Sist oppdatert: 2017-12-08

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