Preprints
https://doi.org/10.5194/se-2020-216
https://doi.org/10.5194/se-2020-216

  25 Jan 2021

25 Jan 2021

Review status: this preprint is currently under review for the journal SE.

On the comparison of strain measurements from fibre optics with dense seismometer array at Etna volcano (Italy)

Gilda Currenti1, Philippe Jousset2, Rosalba Napoli1, Charlotte Krawczyk2,3, and Michael Weber2,4 Gilda Currenti et al.
  • 1Istituto Nazionale di Geofisica e Vulcanologia-Osservatorio Etneo, Piazza Roma 2, Catania, Italy
  • 2GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam 14473, Germany
  • 3Technical University Berlin, Ernst-Reuter-Platz 1, Berlin10587, Germany
  • 4University Potsdam, Karl-Liebknecht-Str. 24-25, Potsdam 14476, Germany

Abstract. We demonstrate the capability of Distributed Acoustic Sensing (DAS) in recording volcano related dynamic strain at Etna (Italy). In summer 2019, we gathered DAS measurements from a 1.5 km long fibre in a shallow trench and seismic records from a conventional dense array comprising 26 broadband sensors deployed in Piano delle Concazze close to the summit area. The multifaceted style of Etna activity during the acquisition period gives the extraordinary opportunity to record and detect tiny strain changes (few 10−8 strain) in correspondence with volcanic events. To validate the DAS strain measures, we explored array-derived methods to estimate strain changes from the seismic signals and to compare with strain DAS signals. A general good agreement was found between array-derived strain and DAS measures along the fibre optic cable. Short wavelength discrepancies correspond with fault zones, showing the potential of DAS in mapping local perturbations of the strain field, and thus site effect, due to small-scale heterogeneities in volcanic settings.

Gilda Currenti et al.

Status: open (until 08 Mar 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2020-216', Anonymous Referee #1, 26 Feb 2021 reply
  • RC2: 'Comment on se-2020-216', Corentin Caudron, 05 Mar 2021 reply

Gilda Currenti et al.

Gilda Currenti et al.

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Short summary
We investigate the capability of Distributed Acoustic Sensing (DAS) in recording dynamic strain changes related to Etna volcano activity in 2019. To validate the DAS measures, we computed strain estimates from seismic signals recorded by a broadband array. A general good agreement is found between array-derived strain and DAS measures along the fibre optic cable.