HR: 1330h
AN: V23A-08    [Abstracts]
TI: Stress State in Volcanic Areas due to Magmatic Intrusions in the Presence of Fluids
AU: * Tallarico, A
EM: tallarico@geo.uniba.it
AF: Universita' di Bari, Dipartimento di Geologia e Geofisica, Via Orabona, 4, Bari, 70125 Italy
AU: Marzocchi, W
EM: marzocchi@bo.ingv.it
AF: Isituto Nazionale di Geofisica e Vulcanologia, Via Donato Creti, 12, Bologna, 40128 Italy
AB: Magma intrusions commonly affect the seismic pattern in volcanic areas. We propose a model describing the stress change due to a magma intrusion represented by a tensile dislocation in a poro-elastic space. The presence of fluids in the porous medium is taken into account. Their diffusion involves a time dependent stress tensor, in turn the variation in pore pressure causes an elastic deformation in the medium. In this way areas where the seismicity is favored by a magmatic intrusion can change as a function of time. The results are compared with experimental data.
DE: 7280 Volcano seismology (8419)
DE: 8414 Eruption mechanisms
DE: 8439 Physics and chemistry of magma bodies
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2005 Joint Assembly