HR: 1340h
AN: V33A-0674    [Abstracts]
TI: Real-time joint plot of deformation and cumulative seismicity as a tool for the monitoring of dike stability
AU: * Rivalta, E
EM: rivalta@ibogfs.df.unibo.it
AF: Department of Physics University of Bologna, V.le Berti Pichat 8, Bologna, 40126 Italy
AU: Dahm, T
EM: dahm@dkrz.de
AF: Institute of Geophysics University of Hamburg, Bundesstr. 55, Bologna, 40126 Germany
AB: Dike intrusion in fractured media has been modeled using a boundary element code. Results have been successfully compared to analytical prediction of the Effective Media Theory. Average dike opening is found to increase with medium crack density. Observing that dike opening can be related to dike-induced deformation and that crack density is joined to cumulative seismicity, a simple relation has been found to describe dikes in stable equilibrium. Stable dikes are predicted to cause changes in deformation related through a power law relationship to the cumulative seismicity they induce. We present successful tests with data from several major intrusions. If both deformation and seismic monitoring are continuously performed in an active volcanic area, the present method could be used to monitor dike stability.
DE: 7280 Volcano seismology (8419)
DE: 8419 Volcano monitoring (7280)
SC: Volcanology, Geochemistry, Petrology [V]
MN: Fall Meeting 2005