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| Titel |
Towards refined rheological laws to understand magmatic flows. |
| VerfasserIn |
B. Cordonnier, K. U. Hess, D. B. Dingwell |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250030916
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| Zusammenfassung |
| Most of volcanic eruptions exhibit transitions in style during a single eruption. The most
relevant example is probably the cyclic eruptive style of lava domes. The application of
numerical tools on a volcanic system and its surrounding population became the most reliable
way to estimate the risk level areas. However, in order to have the most accurate results and
the better view of the potential hazard for each site these tools have to improve in many
ways.
One of the most important improvements needed is a constrained rheological law.
Newtonian and power laws remain the most common backbone that run the numerical codes.
If those approximations can be justified in some cases, experiments on natural samples have
shown a more complex behavior due to the interaction of the melt, crystals and bubbles
together.
In this survey we present the parameters affecting natural magmas such as their brittle
onset. We generalize all these observations into a new model that can be used for magma flow
simulations. In the conclusion we apply this new law on the dome lava of Mt Unzen volcano. |
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