Preprints
https://doi.org/10.5194/se-2021-75
https://doi.org/10.5194/se-2021-75

  14 Jun 2021

14 Jun 2021

Review status: a revised version of this preprint was accepted for the journal SE and is expected to appear here in due course.

GPR signature of Quaternary faulting: a study from the Mt. Pollino region, southern Apennines, Italy

Maurizio Ercoli1,4, Daniele Cirillo2,4, Cristina Pauselli1,4, Harry M. Jol3, and Francesco Brozzetti2,4 Maurizio Ercoli et al.
  • 1Università degli Studi di Perugia, Dipartimento di Fisica e Geologia, Piazza dell’Università 1, 06123 Perugia , Italy
  • 2Universita “G. d’Annunzio” di Chieti-Pescara, DiSPUTer, via dei Vestini 31, 66100 Chieti, Italy
  • 3University of Wisconsin - Eau Claire, Department of Geography and Anthropology, 105 Garfield Avenue, Eau Claire, WI, 54702
  • 4CRUST Centro inteRUniversitario per l’analisi SismoTettonica tridimensionale, Italy

Abstract. With the aim of unveiling evidence of Late Quaternary faulting, a series of Ground Penetrating Radar (GPR) profiles were acquired across the Campotenese continental basin (Mt. Pollino region) in the southern Apennines active extensional belt (Italy). A set of forty-nine 300 MHz and 500 MHz GPR profiles, traced nearly perpendicular to a buried normal fault, were acquired and carefully processed through a customized workflow. The data interpretation allowed us to reconstruct a pseudo-3D model depicting the boundary between the Mesozoic bedrock and the sedimentary fill of the basin, which were in close proximity to the fault. Once reviewing and defining the GPR signature of faulting, we highlight in our data how near surface alluvial and colluvial sediments appear to be dislocated by a set of conjugate (west and east-dipping) discontinuities that penetrate inside the underlying Triassic dolostones. Close to the contact between the continental deposits and the bedrock, some buried scarps which offset wedge-shaped deposits are interpreted as coseismic ruptures, subsequently sealed by later deposits. Although the use of pseudo-3D GPR data implies more complexity linking the geophysical features among the radar images, we have reconstructed a reliable subsurface fault pattern, discriminating master faults and a series of secondary splays. We believe our contribution provides an improvement in the characterization of active faults in the study area which falls within the Pollino seismic gap and is considered potentially prone to severe surface faulting. Our aim is for our approach and workflow to be of inspiration for further studies in the region as well as for similar high seismic hazard areas characterized by scarcity of near-surface data.

Maurizio Ercoli et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2021-75', Anonymous Referee #1, 13 Jul 2021
    • AC1: 'Reply on RC1', Maurizio Ercoli, 27 Aug 2021
  • RC2: 'Comment on se-2021-75', Anonymous Referee #2, 29 Jul 2021
    • AC2: 'Reply on RC2', Maurizio Ercoli, 27 Aug 2021
  • EC1: 'Comment on se-2021-75', Luca De Siena, 09 Aug 2021
    • AC3: 'Reply on EC1', Maurizio Ercoli, 27 Aug 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2021-75', Anonymous Referee #1, 13 Jul 2021
    • AC1: 'Reply on RC1', Maurizio Ercoli, 27 Aug 2021
  • RC2: 'Comment on se-2021-75', Anonymous Referee #2, 29 Jul 2021
    • AC2: 'Reply on RC2', Maurizio Ercoli, 27 Aug 2021
  • EC1: 'Comment on se-2021-75', Luca De Siena, 09 Aug 2021
    • AC3: 'Reply on EC1', Maurizio Ercoli, 27 Aug 2021

Maurizio Ercoli et al.

Maurizio Ercoli et al.

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Short summary
Past strong earthquakes can produce topographic deformations, often "memorized" in Quaternary sediments, which are typically studied by paleo-seismologists through trenching. Using a Ground Penetrating Radar (GPR), we unveiled possible buried Quaternary faulting in the Mt. Pollino region (southern Italy) in a total invasive way. We aim contributing to seismic hazard assessment of an area potentially prone to destructive events as well as promote our workflow in similar contexts around the world.