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Science 16 November 2001:
Vol. 294. no. 5546, pp. 1510 - 1512
DOI: 10.1126/science.1064893
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Reports

Seismic Evidence of an Extended Magmatic Sill Under Mt. Vesuvius

Emmanuel Auger,1 Paolo Gasparini,1 Jean Virieux,2 Aldo Zollo1

Mt. Vesuvius is a small volcano associated with an elevated risk. Seismic data were used to better define its magmatic system. We found evidence of an extended (at least 400 square kilometers) low-velocity layer at about 8-kilometer depth. The inferred S-wave (~0.6 to 1.0 kilometer per second) and P-wave velocities (~2.0 kilometer per second) as well as other evidence indicate an extended sill with magma interspersed in a solid matrix.

1 Dipartimento di Scienze Fisiche, Università di Napoli Federico II, Complesso di M. S. Angelo, Via Cinthia, 80124 Napoli, Italy.
2 Géosciences Azur, 250 Avenue A. Einstein, 06560 Valbonne, France.

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