Structure of a normal seismogenic fault zone in carbonates: The Vado di Corno Fault,Campo Imperatore,Central Apennines (Italy) |
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| Institution: | 1. Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, 35131 Padova, Italy;2. School of Earth, Atmospheric and Environmental Sciences, University of Manchester, M13 9PL, UK;3. NEXT – Natural and Experimental Tectonics Research Group, Università degli Studi di Parma, Dipartimento di Fisica e Scienze della Terra “Macedonio Melloni”, 43124 Parma, Italy;4. Department of Earth and Environmental Sciences, Università degli Studi di Milano Bicocca, Piazza della Scienza 4, 20126 Milan, Italy;5. Istituto Nazionale di Geofisica e Vulcanologia (INGV), Via di Vigna Murata 605, 00143 Roma, Italy;1. Faculty of Sciences Tunis, University of El Manar, Tunis, Tunisia;2. National Office of Mines, Tunisia;3. Faculty of Sciences Bizerte, University of Carthage, Tunisia;1. Dipartimento di Scienze della Terra, Sapienza Università di Roma, P.le Aldo Moro 5, 00185 Roma, Italy;2. Università degli Studi di Milano, Dipartimento di Scienze della Terra, Via Mangiagalli 34, 20133 Milano, Italy;3. Consiglio delle Nazionale Ricerche, IGAG, c.o. Dipartimento di Scienze della Terra, Sapienza Università di Roma, P.le Aldo Moro 5, 00185 Roma, Italy;4. Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Via Moruzzi 1, 56124 Pisa, Italy;1. Department of Earth Sciences, Sapienza University of Rome, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, Palermo, Italy;3. Consiglio Nazionale delle Ricerche, IGAG, Rome, Italy;4. CERTEMA Ricerca e Innovazione, Cinigiano (Grosseto), Italy;5. Institut de Sciences de la Terre, Université Grenoble-Alpes, Grenoble, France;6. Dipartimento di Geoscienze, University of Padova, Italy;7. Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy;8. Dipartimento di Scienze, Roma Tre University, Rome, Italy;9. Dipartimento di Scienze Fisiche, della Terra e dell''Ambiente, University of Siena, Italy |
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| Abstract: | The Vado di Corno Fault Zone (VCFZ) is an active extensional fault cutting through carbonates in the Italian Central Apennines. The fault zone was exhumed from ～2 km depth and accommodated a normal throw of ～2 km since Early-Pleistocene. In the studied area, the master fault of the VCFZ dips N210/54° and juxtaposes Quaternary colluvial deposits in the hangingwall with cataclastic dolostones in the footwall. Detailed mapping of the fault zone rocks within the ～300 m thick footwall-block evidenced the presence of five main structural units (Low Strain Damage Zone, High Strain Damage Zone, Breccia Unit, Cataclastic Unit 1 and Cataclastic Unit 2). The Breccia Unit results from the Pleistocene extensional reactivation of a pre-existing Pliocene thrust. The Cataclastic Unit 1 forms a ～40 m thick band lining the master fault and recording in-situ shattering due to the propagation of multiple seismic ruptures. Seismic faulting is suggested also by the occurrence of mirror-like slip surfaces, highly localized sheared calcite-bearing veins and fluidized cataclasites. The VCFZ architecture compares well with seismological studies of the L'Aquila 2009 seismic sequence (mainshock MW 6.1), which imaged the reactivation of shallow-seated low-angle normal faults (Breccia Unit) cut by major high-angle normal faults (Cataclastic Units). |
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| Keywords: | Earthquake Central Apennines Carbonate Fault zone Fault rock |
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