How mechanical layering affects local stresses, unrests, and eruptions of volcanoes

Details How mechanical layering affects local stresses, unrests, and eruptions of volcanoes How mechanical layering affects local stresses, unrests, and eruptions of volcanoes

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3116606g&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 16, CiteID L16606

Physics

7

Volcanology: Eruption Mechanisms, Structural Geology: Fractures And Faults, Tectonophysics: Physics Of Magma And Magma Bodies, Tectonophysics: Stresses-Crust And Lithosphere

Scientific paper

In most active volcanoes, unrest periods with dike injections are much more common than eruptions. While widely recognized, this simple observation has not been satisfactorily explained. Surface deformation in volcanoes is commonly attributed to dikes injected from shallow magma chambers that fail to reach the surface. Field observations of dike tips, many of which are blunt, indicate arrest that is primarily controlled by the local stresses in the layers through which the dikes propagate. Numerical models on the stress fields around magma chambers located in an anisotropic, heterogeneous (layered) crust indicate that, for uniform loading, a layered crust normally develops stress fields that are unfavorable for feeder-dike formation. In particular, the models, together with the field observations, indicate that an essentially homogeneous stress field along the potential pathway of a dike is a necessary condition for its reaching the surface to supply magma to a volcanic eruption.

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