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GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L22313, doi:10.1029/2007GL031644, 2007

A horizontal crack in a layered structure satisfies deformation for the 2004–2006 uplift of Campi Flegrei

A. Amoruso

Dipartimento di Fisica, Università di Salerno, Baronissi, Italy


L. Crescentini

Dipartimento di Fisica, Università di Salerno, Baronissi, Italy


A. T. Linde

Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D. C., USA


I. S. Sacks

Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D. C., USA


R. Scarpa

Dipartimento di Matematica ed Informatica, Università di Salerno, Fisciano, Italy


P. Romano

Dipartimento di Fisica, Università di Salerno, Baronissi, Italy


Abstract

Sources responsible for volcanic unrest produce characteristic surface deformation. Given a sufficient number of distributed observation points, inversion is the preferred procedure for retrieving the source parameters of location and volume or pressure change. Most often the solutions have been for point sources embedded in a homogeneous half-space. Recent work indicates that layered structures, particularly those with soft superficial layers, significantly perturb the deformation pattern compared with that for the homogeneous medium. We apply the methods of L. Crescentini and A. Amoruso to data for the most recent mini-uplift in the Campi Flegrei caldera and show that models using a homogeneous medium cannot adequately fit all the data. Incorporating a layered structure appropriate for Campi Flegrei allows a significantly better fit, avoiding characteristic discrepancies which are revealed by a synthetic test. Failure to use such structure results in incorrect source parameters, possibly leading to misleading geophysical interpretations.

Received 18 August 2007; accepted 15 October 2007; published 24 November 2007.

Keywords: volcanic unrest; deformation data; Campi Flegrei.

Index Terms: 8440 Volcanology: Calderas; 8419 Volcanology: Volcano monitoring (7280); 1211 Geodesy and Gravity: Non-tectonic deformation.

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Citation: Amoruso, A., L. Crescentini, A. T. Linde, I. S. Sacks, R. Scarpa, and P. Romano (2007), A horizontal crack in a layered structure satisfies deformation for the 2004–2006 uplift of Campi Flegrei, Geophys. Res. Lett., 34, L22313, doi:10.1029/2007GL031644.