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Authors: Improta, L.*
Ferranti, L.*
De Martini, P. M.*
Piscitelli, S.*
Bruno, P. P.*
Burrato, P.*
Civico, R.*
Giocoli, A.*
Iorio, M.*
D'Addezio, G.*
Maschio, L.*
Title: Detecting young, slow‐slipping active faults by geologic and multidisciplinary high‐resolution geophysical investigations: A case study from the Apennine seismic belt, Italy.
Title of journal: Journal of Geophysical Research
Series/Report no.: /115 (2010)
Publisher: American Geophysical Union
Issue Date: 9-Nov-2010
DOI: 10.1029/2010JB000871
Keywords: active fault
integrated geophysical investigations
morpho-tectonic analysis
Val d'Agri
Southern Italy
1857 Earthquake
Abstract: The Southern Apennines range of Italy presents significant challenges for active fault detection due to the complex structural setting inherited from previous contractional tectonics, coupled to very recent (Middle Pleistocene) onset and slow slip rates of active normal faults. As shown by the Irpinia Fault, source of a M6.9 earthquake in 1980, major faults might have small cumulative deformation and subtle geomorphic expression. A multidisciplinary study including morphological-tectonic, paleoseismological, and geophysical investigations has been carried out across the extensional Monte Aquila Fault, a poorly known structure that, similarly to the Irpinia Fault, runs across a ridge and is weakly expressed at the surface by small scarps/warps. The joint application of shallow reflection profiling, seismic and electrical resistivity tomography, and physical logging of cored sediments has proved crucial for proper fault detection because performance of each technique was markedly different and very dependent on local geologic conditions. Geophysical data clearly (1) image a fault zone beneath suspected warps, (2) constrain the cumulative vertical slip to only 25–30 m, (3) delineate colluvial packages suggesting coseismic surface faulting episodes. Paleoseismological investigations document at least three deformation events during the very Late Pleistocene (<20 ka) and Holocene. The clue to surface-rupturing episodes, together with the fault dimension inferred by geological mapping and microseismicity distribution, suggest a seismogenic potential of M6.3. Our study provides the second documentation of a major active fault in southern Italy that, as the Irpinia Fault, does not bound a large intermontane basin, but it is nested within the mountain range, weakly modifying the landscape. This demonstrates that standard geomorphological approaches are insufficient to define a proper framework of active faults in this region. More in general, our applications have wide methodological implications for shallow imaging in complex terrains because they clearly illustrate the benefits of combining electrical resistivity and seismic techniques. The proposed multidisciplinary methodology can be effective in regions characterized by young and/or slow slipping active faults.
Appears in Collections:04.04.11. Instruments and techniques
04.04.09. Structural geology
04.02.06. Seismic methods
04.02.07. Instruments and techniques
04.02.04. Magnetic and electrical methods
04.04.01. Earthquake geology and paleoseismology
Papers Published / Papers in press

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Improta_etal_2010_JGR-VdA.pdfpublished manuscript15.03 MBAdobe PDFView/Open
paper_2010JB000871_R2_merged.pdfaccepted manuscript3.23 MBAdobe PDFView/Open

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