Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/1509
AuthorsDel Negro, C.* 
Ferrucci, F.* 
Napoli, R.* 
TitleRetrieval of large volcanomagnetic effects observed during the 1981 eruption of Mt.Etna
Issue DateMar-1997
Series/Report no.40/2
URIhttp://hdl.handle.net/2122/1509
KeywordsMt. Etna
thermomagnetism
electrofiltration
piezomagnetism
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous 
AbstractA large temporal anomaly was retrieved in the total geomagnetic field series recorded in 1981 on Mt. Etna at two continuously recording magnetometers, and associated with the March 17-23 eruption of the volcano. Variations were of such large scale that a 10 nT anomaly was observed at a distance of some 7 km from the eruptive events, calling for a significant extension and depth of the magnetic anomaly source. We discuss here some models which may account for such magnetic changes in relation to the eruption mechanism inferred by other data. The anomaly is thought to be accounted for by the joint effect of piezomagnetism of the country rocks and thermal demagnetisation engendered by a large intrusive dyke.
Appears in Collections:Annals of Geophysics

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