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Discussion papers
https://doi.org/10.5194/sed-5-117-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/sed-5-117-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Short communication 17 Jan 2013

Short communication | 17 Jan 2013

Review status
This discussion paper is a preprint. It has been under review for the journal Solid Earth (SE). The revised manuscript was not accepted.

A reversed hierarchy of active normal faults: the 6 April 2009, Mw 6.3, L'Aquila earthquake (Italy)

L. Bonini1, D. Di Bucci2, G. Toscani1, S. Seno1, and G. Valensise3 L. Bonini et al.
  • 1Dipartimento di Scienze della Terra e dell'Ambiente, Università di Pavia, Pavia, Italy
  • 2Dipartimento della Protezione Civile, Rome, Italy
  • 3Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy

Abstract. Understanding the relationship between seismogenic slip at depth and surface deformation is fundamental in any seismic hazard analysis because the assessment of the earthquake potential of large continental faults relies largely on field investigations. The well-documented 6 April 2009, Mw 6.3, L'Aquila earthquake affords a unique opportunity to explore the relationships between the activity of the deep source and its surface evidence.

We used available high-resolution geologic, geodetic and seismological data aided by analogue modeling to reconstruct the geometry of the seismogenic rupture in relation with surface and sub-surface faults.

We contend that the earthquake was caused by a blind fault, controlled at depth by pre-existing discontinuities and expressed at the surface by pseudo-primary breaks resulting from coseismic crustal bending.

Finally, we propose a scheme for hierarchizing normal faults that explains all surface occurrences related to blind faulting in the frame of a single, mechanically coherent, interpretative model. Failure to appreciate such complexity may result in severe over– or under-estimation of the local seismogenic potential.

L. Bonini et al.
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
L. Bonini et al.
L. Bonini et al.
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