Architecture and seismotectonics of a regional low‐angle normal fault zone in central Italy

Architecture and seismotectonics of a regional low‐angle normal fault zone in central Italy Information from surface geology, subsurface geology (boreholes, seismic reflection, and refraction profiles), and seismicity are used to depict the geometry and the possible seismogenic role of the Altotiberina Fault (AF), a low‐angle normal fault in central Italy. The AF extends along the inner Umbria region, for a length of ∼70 km, with an average dip of ∼30° and an horizontal displacement up to 5 km. It emerges west of the inner border of the Tiber basin and deepens beneath the Umbria‐Marche carbonate fold‐and‐thrust belt to a depth of 12–14 km. Close to the AF surface trace, low‐angle synthetic east dipping normal faults extensively outcrop, whereas high‐angle antithetic west dipping normal faults prevail farther east. Integrating geological and seismologic information, it can be stated that the AF behaves as an active extensional fault zone and represents the basal detachment of the west dipping seismogenic normal faults of the Umbria‐Marche region. The AF belongs to a regional NE dipping low‐angle normal fault system (Etrurian Fault System (EFS)), which extends for ∼350 km from northwestern Tuscany to southern Umbria. Early preliminary considerations suggest that the EFS may play an important role in controlling active extension and related seismicity in northern central Italy. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tectonics Wiley

Architecture and seismotectonics of a regional low‐angle normal fault zone in central Italy

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Publisher
Wiley
Copyright
Copyright © 2000 by the American Geophysical Union.
ISSN
0278-7407
eISSN
1944-9194
DOI
10.1029/2000TC900023
Publisher site
See Article on Publisher Site

Abstract

Information from surface geology, subsurface geology (boreholes, seismic reflection, and refraction profiles), and seismicity are used to depict the geometry and the possible seismogenic role of the Altotiberina Fault (AF), a low‐angle normal fault in central Italy. The AF extends along the inner Umbria region, for a length of ∼70 km, with an average dip of ∼30° and an horizontal displacement up to 5 km. It emerges west of the inner border of the Tiber basin and deepens beneath the Umbria‐Marche carbonate fold‐and‐thrust belt to a depth of 12–14 km. Close to the AF surface trace, low‐angle synthetic east dipping normal faults extensively outcrop, whereas high‐angle antithetic west dipping normal faults prevail farther east. Integrating geological and seismologic information, it can be stated that the AF behaves as an active extensional fault zone and represents the basal detachment of the west dipping seismogenic normal faults of the Umbria‐Marche region. The AF belongs to a regional NE dipping low‐angle normal fault system (Etrurian Fault System (EFS)), which extends for ∼350 km from northwestern Tuscany to southern Umbria. Early preliminary considerations suggest that the EFS may play an important role in controlling active extension and related seismicity in northern central Italy.

Journal

TectonicsWiley

Published: Dec 1, 2000

References

  • The 1997 Umbria‐Marche, Italy, earthquake sequence: A first look at the main shocks and aftershocks
    Amato, Amato
  • Flexural rotation of normal faults
    Buck, Buck
  • Active tectonics in the central Apennines and possible implications for seismic hazard analysis in peninsular Italy
    Cello, Cello; Mazzoli, Mazzoli; Tondi, Tondi; Turco, Turco
  • Moment tensor analysis of the central Italy earthquake sequence of September‐October 1997
    Ekstrom, Ekstrom; Morelli, Morelli; Boschi, Boschi; Dziewonski, Dziewonski
  • Passive margins: A model of formation
    Le Pichon, Le Pichon; Sibuet, Sibuet
  • Crustal shortening and duplication of the Moho in the Northern Apennines: A view from seismic refraction data
    Ponziani, Ponziani; De Franco, De Franco; Minelli, Minelli; Biella, Biella; Federico, Federico; Pialli, Pialli
  • Seismic slip on a low angle normal fault in the Gulf of Corinth: Evidence from high‐resolution cluster analysis of microearthquakes
    Rietbrock, Rietbrock; Tiberi, Tiberi; Sherbaum, Sherbaum; Lyon‐Caen, Lyon‐Caen

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