Preprints
https://doi.org/10.5194/se-2020-211
https://doi.org/10.5194/se-2020-211

  12 Jan 2021

12 Jan 2021

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

Mapping and evaluating kinematics and stress/strain field at active faults and fissures: a comparison between field and drone data at NE Rift, Mt Etna (Italy)

Alessandro Tibaldi1,2, Noemi Corti1, Emanuela De Beni3, Fabio Luca Bonali1,2, Susanna Falsaperla3, Horst Langer3, Marco Neri3, Massimo Cantarero3, Danilo Reitano3, and Luca Fallati1 Alessandro Tibaldi et al.
  • 1Department of Earth and Environmental Sciences, University of Milan-Bicocca, Milan, Italy
  • 2CRUST- Interuniversity Center for 3D Seismotectonics with Territorial Applications, Italy
  • 3Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo, Sezione di Catania, Italy

Abstract. We collected drone data to quantify the kinematics at extensional fractures and normal faults, integrated this information with seismological data to reconstruct the stress field, and critically compared the results with previous fieldwork to assess the best practice. As key site, we analysed a sector of the North-East Rift of Mt Etna, an area affected by continuous ground deformation linked to gravity sliding of the volcano's eastern flank and dyke injection. The studied sector is characterized also by the existence of eruptive craters and fissures and lava flows. This work shows that this rift segment is affected by a series of NE-striking, parallel extensional fractures characterized by an opening mode along an average N105.7° vector. Normal faults strike parallel to the extensional fractures, although they tend to bend slightly when crossing topographic highs corresponding to pyroclastic cones. The extensional strain obtained by cumulating the net offset at extensional fractures with the fault heave gives a stretching ratio of 1.003 in the northeastern part of the study area and 1.005 in the southwestern part. Given a maximum age of 1614 yr AD for the offset lavas, we obtained an extension rate of 1.9 cm/yr for the last 406 yr. The stress field is characterised by a σHmin trending NW-SE. Results indicate that Structure-from-Motion photogrammetry applied to drone surveys allows to collect large amounts of data with a resolution of 2–3 cm, a detail comparable to field surveys. In the same amount of time, drone survey can allow to collect more data than classical fieldwork, especially in logistically difficult rough terrains.

Alessandro Tibaldi et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2020-211', Daniele Trippanera, 10 Feb 2021
    • AC1: 'Reply on RC1', Alessandro Tibaldi, 23 Feb 2021
  • RC2: 'Comment on se-2020-211', Roberto Emanuele Rizzo, 18 Feb 2021
    • AC2: 'Reply on RC2', Alessandro Tibaldi, 23 Feb 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2020-211', Daniele Trippanera, 10 Feb 2021
    • AC1: 'Reply on RC1', Alessandro Tibaldi, 23 Feb 2021
  • RC2: 'Comment on se-2020-211', Roberto Emanuele Rizzo, 18 Feb 2021
    • AC2: 'Reply on RC2', Alessandro Tibaldi, 23 Feb 2021

Alessandro Tibaldi et al.

Alessandro Tibaldi et al.

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Short summary
The North-East Rift of Mt Etna is affected by ground deformation linked to gravity sliding of the volcano flank and dyke injection. Drone surveys show that the rift is affected by NE-striking extensional fractures and normal faults. Given an age of 1614 yr AD for the offset lavas, we obtained an extension rate of 1.9 cm/yr for the last 406 yr. The stress field is characterised by a NW-SE σHmin. Drone surveys allow to quickly collect data with a resolution of 2–3 cm.