Lava channel formation via the viscoplastic indentation of hot substrates

Details Lava channel formation via the viscoplastic indentation of hot substrates Lava channel formation via the viscoplastic indentation of hot substrates

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3319305g&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 19, CiteID L19305

Physics

2

Structural Geology: Mechanics, Theory, And Modeling, Volcanology, Volcanology: Eruption Mechanisms And Flow Emplacement, Volcanology: Lava Rheology And Morphology

Scientific paper

Lava channels that appear to have been incised into the underlying substrate are commonly ascribed to thermal or thermomechanical erosion. Here we show that where the associated lava flow moves on a hot and soft substrate, the channel may also be ascribed to viscoplastic indentation of the substrate. A simple model of viscoplastic indentation leads to distinct predictions that can be readily tested in the field. For example, two broad, wedge-shaped, levee-like features should rise from the substrate during indentation. Such features appear to have risen alongside of a channel that was incised into a hot and soft, recently emplaced basaltic substrate during the 2001 eruption on Mount Etna.

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