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MPV-05 Volcanic eruptions: Chamber-, conduit-, and depositional processes and their implication for monitoring and hazard assessment
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Stromboli volcano erupts again on 27 February 2007: And magnetic field monitoring is a key part of the picture
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Ciro Del Negro, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Rosalba Napoli, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Gaetana Ganci, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Gilda Currenti, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Filippo Greco, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Danila Scandura, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Antonino Sicali, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
Gennaro Budetta, Istituto Nazionale di Geofisica e Vulcanologia (Italy)
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Remarkable changes in the local magnetic field preceded and accompanied the onset of the 2007 eruption at Stromboli Island. After differential magnetic field measurements were filtered from the external noise by using ???, we recognized four stages in the total intensity changes, which are closely related to different volcanic events: (i) a slow and continuous decrease at SLN station, associated with volcano-tectonic activity observed from April to July 2006; (ii) an increase at SLN and SPC stations in correspondence of a phase of increasing in the volcanic tremor recorded from the end of 2006; (iii) a rapid decrease at SLN and SPC stations preceding the onset of the 27 February 2007 eruption and (iv) step-like magnetic variations coincident with the opening and propagation of February 27 eruptive fissures in the Sciara del Fuoco. These observations are consistent with those calculated from volcanomagnetic models, in which the magnetic changes are generated by a sequence of pressurizzation-depressurizzation within the subaerial edifice, produced by magma injections occurred during 2006 and leading to the 2007 eruption. The position and the geometry of sources, which could explain the total intensity changes, were estimated and provided us the most likely scenario occurred before and during eruption.
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