Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4967
AuthorsDiaferia, I.* 
Loddo, M.* 
Schiavone, D.* 
Siniscalchi, A.* 
TitleShallow to intermediate resistivity features of the Colfiorito Fault System inferred by DC and MT survey
Issue DateApr-2008
Series/Report no.2-3/51 (2008)
URIhttp://hdl.handle.net/2122/4967
KeywordsColfiorito fault system
magnetotellurics
geoelectrics
fluids
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods 
AbstractOver the last decade electromagnetic (EM) measurements have provided new constraints on the upper-crustal structure of the major fault zones in the world, both when they act as conduit and as a barrier, due to strong sensitivity of resistivity to fluids circulation and mineralization. On the track of a high impact magnetotelluric (MT) study performed across the San Andreas Fault, high resolution EM data were collected in the Colfiorito epicentral area along profiles crossing some main fault lineaments. Being the study focussed both on shallow that on intermediate resistivity distribution in the brittle upper-crust, a MT profile was integrated by several electrical resistivity tomographies (ERT). The latter were successful in locating faults even where the structures are buried by a wide covering of Quaternary deposits and in the recognition of different electrical signatures of the faults. MT resistivity model crossing Mt. Prefoglio normal fault clearly imaged the typical thrust structures of the area and a high conductive zone spatially related to the fault. Seismicity seems to be located outside such conductive area, whose behaviour suggests a fluidised and altered zone incapable of supporting significant stress internally.
Appears in Collections:Annals of Geophysics

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