HR: 12:05h
AN: V42A-08    [Abstracts]
TI: The Stability of Dike-fed Eruptions Based on Magma Transport Modeling
AU: * Phillips, B R
EM: benp@lanl.gov
AF: Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
AU: Baldridge, W S
EM: sbaldridge@lanl.gov
AF: Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
AU: Gable, C W
EM: gable@lanl.gov
AF: Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
AU: Sicilian, J M
EM: sicilian@lanl.,gov
AF: Computer and Computational Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
AB: Finite volume calculations of magma flow in dikes are presented that tie observational markers available during effusive eruptions to the stability of the event. We use a new model for heat and mass transfer of a melt with a temperature dependent viscosity and the potential to undergo phase change. Magma driving pressures are coupled with dike geometries that satisfy simple elastic considerations for the host rock. Different regimes are identified that dictate a volcanic system's tendency towards eruption cessation due to thermal close off of the dike, steady eruption, or growth of the eruption. These fields are characterized as a function of dike size, magma overpressure, and variations in magma flux. We verify our model by looking at the applicability of the identified trends to modern systems.
DE: 8145 Physics of magma and magma bodies
DE: 8414 Eruption mechanisms and flow emplacement
DE: 8425 Effusive volcanism
SC: Volcanology, Geochemistry, and Petrology [V]
MN: 2007 Joint Assembly