Physics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2665l&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 17, p. 2665-2668
Physics
7
Seismology: Body Wave Propagation, Volcanology: Physics And Chemistry Of Magma Bodies
Scientific paper
To constrain the upper depth range of lateral heterogeneities beneath Mt Etna, a seismic tomography method with artificial sources is designed to undershoot the target and restrict the depth of seismic propagation by reflection at the top of the basement. A strong high velocity anomaly thus imaged southeast of the summit, interpreted as a magmatic body, is reliably constrained to reach at least as shallow as 2 km depth where exsolution of SO2 from magma may occur. The high gas output rate of Etna [Allard, 1997] hence appears as the normal complement of the huge magma body seismically imaged. This magma body is located beneath the volcanic edifice rather than within, which attests to the control of volcanism by extension. These volatile output and internal structure distinguish Mt Etna volcanism among current types and may relate to the peculiar context of a recent regional change from subduction-related compression to extension.
Hirn Alfred
Laigle Mireille
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