HR: 17:20h
AN: V54B-06 INVITED    [Abstracts]
TI: From Magma Fracture to a Seismic Magma Flow Meter
AU: * Neuberg, J W
EM: J.Neuberg@see.leeds.ac.uk
AF: The University of Leeds School of Earth & Environment, Woodhouse Lane, Leeds, LS2 9JT, United Kingdom
AB: Seismic swarms of low-frequency events occur during periods of enhanced volcanic activity and have been related to the flow of magma at depth. Often they precede a dome collapse on volcanoes like Soufriere Hills, Montserrat, or Mt St Helens. This contribution is based on the conceptual model of magma rupture as a trigger mechanism. Several source mechanisms and radiation patterns at the focus of a single event are discussed. We investigate the accelerating event rate and seismic amplitudes during one swarm, as well as over a time period of several swarms. The seismic slip vector will be linked to magma flow parameters resulting in estimates of magma flux for a variety of flow models such as plug flow, parabolic- or friction controlled flow. In this way we try to relate conceptual models to quantitative estimations which could lead to estimations of magma flux at depth from seismic low-frequency signals.
DE: 8419 Volcano monitoring (7280)
DE: 8439 Physics and chemistry of magma bodies
DE: 8488 Volcanic hazards and risks
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting