Three-dimensional resistivity tomography of Vulcan's forge, Vulcano Island, southern Italy

Details Three-dimensional resistivity tomography of Vulcan's forge, Vulcano Island, southern Italy Three-dimensional resistivity tomography of Vulcan's forge, Vulcano Island, southern Italy

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3715308r&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 15, CiteID L15308

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Computation

4

Exploration Geophysics: Magnetic And Electrical Methods (5109), Exploration Geophysics: General Or Miscellaneous, Geochemistry: Hydrothermal Systems (0450, 3017, 3616, 4832, 8135, 8424), Electromagnetics: Electromagnetic Theory, Computational Geophysics: Modeling (1952, 4255)

Scientific paper

9,525 DC resistivity measurements were taken along 9 profiles crossing the volcanic edifice of La Fossa di Vulcano (the forge of God Vulcan in ancient Roman mythology), Vulcano Island (Italy) using a total of 958 electrode locations. This unique data set has been inverted in 3D by minimizing the L2 norm of the data misfit using a Gauss-Newton approach. The true 3D inversion was performed using parallel processing on an unstructured tetrahedral mesh containing 75,549 finite-element nodes and 398,208 elements to accurately model the topography of the volcanic edifice. The 3D tomogram shows a very conductive body (>0.1 S/m) comprised inside the Pietre Cotte crater with conductive volumes that are consistent with the position of temperature and CO2 anomalies at the ground surface. This conductive body is interpreted as the main hydrothermal body. It is overlaid by a resistive and cold cap in the bottom of the crater. The position of the conductive body is consistent with the deformation source responsible for the observed 1990-1996 deflation of the volcano associated with a decrease of hydrothermal activity.

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