Physics – Geophysics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j..40c&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 10, pp. 40-1, CiteID 1402, DOI 10.1029/2001GL014493
Physics
Geophysics
9
Mathematical Geophysics: Modeling, Mathematical Geophysics: Nonlinear Dynamics, Volcanology: Eruption Mechanisms, Volcanology: General Or Miscellaneous
Scientific paper
Magma viscosity is strongly temperature-dependent. When hot magma flows in a conduit, heat is lost through the walls and the temperature decreases along the flow causing a viscosity increase. For particular values of the controlling parameters the steady-flow regime in a conduit shows two stable solutions belonging either to the slow or to the fast branch. As a consequence, this system may show an hysteresis effect, and the transition between the two branches can occur quickly when the critical points are reached. In this paper we describe a model to study the relation between the pressure at the inlet and the volumetric magma flow rate in a conduit. We apply this model to explain an hysteric jump observed during the dome growth at Soufrière Hills volcano (Montserrat), and described by Melnik and Sparks [1999] using a different model.
Costa Antonio
Macedonio Giovanni
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