Shallow-conduit dynamics at Stromboli Volcano, Italy, imaged from waveform inversions

Geological Society of London Special Publications
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Abstract

Modelling of Very-Long-Period (VLP) seismic data recorded during explosive activity at Stromboli in 1997 provides an image of the uppermost 1 km of its volcanic plumbing system. Two distinct dyke-like conduit structures are identified, each representative of explosive eruptions from two different vents located near the northern and southern perimeters of the summit crater. Observed volumetric changes in the dykes are viewed as the result of a piston-like action of the magma associated with the disruption of a gas slug transiting through discontinuities in the dyke apertures. Accompanying these volumetric source components are single vertical forces resulting from an exchange of linear momentum between the source and the Earth. In the dyke system underlying the northern vent, a primary disruption site is observed at an elevation near 440 m where a bifurcation in the conduit occurs. At a depth of 80 m below sea level, a sharp corner in the conduit marks another location where the elastic response of the solid to the action of the upper source induces pressure and momentum changes in the magma. In the conduit underlying the southern vent, the junction of two inclined dykes with a sub-vertical dyke at 520 m elevation is a primary site of gas slug disruption, and another conduit corner 280 m below sea level represents a coupling location between the elastic response of the solid and fluid motion.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Shallow-conduit dynamics at Stromboli Volcano, Italy, imaged from waveform inversions
Series title Geological Society of London Special Publications
DOI 10.1144/SP307.5
Volume 307
Year Published 2008
Language English
Publisher The Geological Society of London
Publisher location London
Contributing office(s) Volcano Hazards Program
Description 28 p.
First page 57
Last page 84
Country Italy
Other Geospatial Stromboli