Preprints
https://doi.org/10.5194/se-2021-121
https://doi.org/10.5194/se-2021-121

  01 Oct 2021

01 Oct 2021

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

Surface-wave tomography for mineral exploration: a successful combination of passive and active data (Siilinjärvi phosphorus mine, Finland)

Chiara Colombero1, Myrto Papadopoulou1, Tuomas Kauti2, Pietari Skyttä2, Emilia Koivisto3, Mikko Savolainen4, and Laura Valentina Socco1 Chiara Colombero et al.
  • 1Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Torino, 10129, Italy
  • 2Department of Geography and Geology, FI-20014 University of Turku, Finland
  • 3Department of Geosciences and Geography, University of Helsinki, Helsinki, FI-00014, Finland
  • 4Yara Suomi Oy, Siilinjärvi, Finland

Abstract. Surface wave (SW) methods are ideal candidates for an effective and sustainable development of seismic exploration, but still remain under-exploited in hard rock sites. We present a successful application of active and passive surface wave tomography for the characterization of the southern continuation of the Siilinjärvi phosphate deposit (Finland). A semi-automatic workflow for the extraction of the path-average dispersion curves (DCs) from ambient seismic noise data is proposed, including identification of time windows with strong coherent SW signal, azimuth analysis and two-station method for DC picking. DCs retrieved from passive data are compared with active SW tomography results recently obtained at the site. Passive data are found to carry information at longer wavelengths, thus extending the investigation depth. Active and passive DCs are consequently inverted together to retrieve a deep pseudo-3D shear-wave velocity model for the site, with improved resolution. The seismic results are compared with the latest available geological models to both validate the proposed workflow and improve the interpretation of the geometry, extent and contacts of the mineralization. Important large-scale geological boundaries and structural discontinuities are recognized from the results, demonstrating the effectiveness and advantages of the methods for mineral exploration perspectives.

Chiara Colombero et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2021-121', Anonymous Referee #1, 01 Nov 2021
    • AC1: 'Reply on RC1', Chiara Colombero, 24 Jan 2022
  • RC2: 'Comment on se-2021-121', Anonymous Referee #2, 06 Jan 2022
    • AC2: 'Reply on RC2', Chiara Colombero, 24 Jan 2022

Chiara Colombero et al.

Chiara Colombero et al.

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Short summary
Passive-source surface waves may be exploited in mineral exploration for deeper investigations. We propose a semi-automatic workflow for their processing. The geological intepretation of the results obtained at a mineral site (Siilinjärvi phosphorus mine) shows large potentialities and effectiveness of the proposed workflow.