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| Titel |
The effect of volatile bubble growth rate on the periodic dynamics of shallow volcanic systems |
| VerfasserIn |
I. L'Heureux |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 17, no. 2 ; Nr. 17, no. 2 (2010-04-20), S.221-235 |
| Datensatznummer |
250013666
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| Publikation (Nr.) |
 copernicus.org/npg-17-221-2010.pdf |
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| Zusammenfassung |
| Many volcanic eruptions exhibit periodic behavior. For instance, periodic
ground inflations and deflations in proximity to a volcano are the
consequences of periodic overpressure variations in the magma conduit and
periodic magma flow rate. The period varies from a few hours to many years,
depending on the volcano parameters. On the other hand, volatile components
exsolve from an ascending magma by forming bubbles. The strong dependence of
the melt viscosity with the volatile concentration generates a positive
feedback on the magma flow. We consider here the effect of the growth of
volatile bubbles on the dynamics of a magmatic flow in a shallow volcanic
system. Various expressions for the bubble growth rate are treated, thus
generalizing previous work. In particular, a growth rate law derived from a
recent many-bubble theory is considered. It is seen that, for a range of
flow rate values at the base of the magma conduit, the system undergoes a
Hopf bifurcation. Periodic solutions compatible with the observations are
generated. This work shows that measurements of volcanic activity have the
potential to test various bubble growth models in magmatic systems. |
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