Preprints
https://doi.org/10.5194/nhess-2022-256
https://doi.org/10.5194/nhess-2022-256
 
24 Oct 2022
24 Oct 2022
Status: this preprint is currently under review for the journal NHESS.

Instantaneous LEM back-analyses of major rockslides triggered during the 2016–2017 Central Italy seismic sequence

Luca Verrucci1, Giovanni Forte2, Melania De Falco2, Paolo Tommasi3, Giuseppe Lanzo1, Kevin W. Franke4, and Antonio Santo2 Luca Verrucci et al.
  • 1Dipartimento d’Ingegneria Strutturale e Geotecnica, Sapienza Università di Roma La Sapienza, Rome, Italy
  • 2Dipartimento d’Ingegneria Civile, Edile e Ambientale; Università degli Studi di Napoli Federico II, Naples, Italy
  • 3CNR – Istituto di Geologia Ambientale e Geoingegneria, Rome, Italy
  • 4Department of Civil and Environmental Engineering, Brigham Young University, Provo, UT, USA

Abstract. Among the almost 1400 landslides triggered by the shocks of the 2016–2017 Central Italy seismic sequence, only a limited number, all classifiable as rockslides, involved volumes larger than 100 m3. Four of these failures, including the three largest, were described in terms of structural and geomechanical investigations in a previous study. In this paper, the mechanics of these failures under seismic actions are investigated. The estimated acceleration time histories at the rockslide sites were evaluated through a 2D simplified numerical model accounting for the attenuation phenomena and for the topographic effect of the rock cliffs from which the slide detached. Instantaneous stability analyses were carried out to obtain insights into the variability of the instantaneous margin of safety along the development of the shocks over the entire spectrum of mechanisms that could be activated. Finally, some general suggestions on the pseudo-static verification method for three-dimensional cases are proposed, which represent useful indications to hazard evaluation at local and regional scale.

Luca Verrucci et al.

Status: open (until 17 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Luca Verrucci et al.

Luca Verrucci et al.

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Short summary
Stability analyses in static and seismic conditions were performed on four rockslides occurred during the main shocks of the 2016–2017 Central Italy seismic sequence. These results also indicate that specific structural features of the slope must carefully be accounted for in evaluating potential hazard on r transportation infrastructures in mountainous regions.
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