HR: 0800h
AN: V51D-0784    [Abstracts]
TI: Relating stress models of magma emplacement to volcano-tectonic earthquakes
AU: * Vargas-Bracamontes, D
EM: eedmvb@see.leeds.ac.uk
AF: University of Leeds, Institute of Geophysics and Tectonics, Leeds, LS2 9JT, United Kingdom
AU: Neuberg, J
EM: j.neuberg@see.leeds.ac.uk
AF: University of Leeds, Institute of Geophysics and Tectonics, Leeds, LS2 9JT, United Kingdom
AB: Among the various types of seismic signals linked to volcanic processes, volcano-tectonic earthquakes are probably the earliest precursors of volcanic eruptions. Understanding their relationship with magma emplacement can provide insight into the mechanisms of magma transport at depth and assist in the ultimate goal of forecasting eruptions. Volcano-tectonic events have been observed to occur on faults that experience increases in Coulomb stress changes as the result of magma intrusions. To simulate stress changes associated with magmatic injections, we test different models of volcanic sources in an elastic half-space. For each source model, we look at several aspects that influence the stress conditions of the magmatic system such as the regional tectonic setting, the effect of varying the elastic parameters of the media, the evolution of the magma with time, as well as the volume and rheology of the ascending magma.
DE: 7280 Volcano seismology (8419)
DE: 8168 Stresses: general
DE: 8419 Volcano monitoring (7280)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting