23 Nov 2022
 | 23 Nov 2022

Mapping the basement of the Cerdanya Basin (Eastern Pyrenees) using seismic ambient noise

Jordi Diaz, Sergi Ventosa, Martin Schimmel, Mario Ruiz, Albert Macau, Anna Gabàs, David Martí, Özgenç Akin, and Jaume Vergés

Abstract. Ambient seismic noise acquired in the Cerdanya Basin (Eastern Pyrenees) is used to assess the capability of different methodologies to map the geometry of a small-scale sedimentary basin. We present results based on a 1-year long broad-band deployment covering a large part of the Eastern Pyrenees and a 2-months long high-density deployment covering the basin with interstation distances around 1.5 km. The explored techniques include autocorrelations, horizontal to vertical spectra ratio, ambient noise Rayleigh wave tomography and band-pass filtered ambient noise amplitude mapping. The basement depth estimations retrieved from each of these approaches, based on independent datasets and different implicit assumptions, are consistent, showing that the deeper part of the basin is located in its central part, reaching depths of 600–700 m close to the Têt Fault trace bounding the Cerdanya Basin to the NE. The consistency between the results from all the methodologies provides solid constraints to our basement depth estimation. The results show also that when high-density seismic data are available, mapping the ambient noise amplitude in a selected frequency band is a valid tool to quickly map the sedimentary 3D geometry. Beside this methodological aspect, our results help to improve the geological characterisation of the Cerdanya Basin and will provide further constraints to refine the seismic risk maps of an area of relevant touristic and economic activity.

Jordi Diaz 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 egusphere-2022-1138', Anonymous Referee #1, 03 Jan 2023
    • AC2: 'Reply on RC1', Jordi Diaz, 22 Feb 2023
  • RC2: 'Comment on egusphere-2022-1138', Anonymous Referee #2, 10 Jan 2023
    • AC3: 'Reply on RC2', Jordi Diaz, 22 Feb 2023
  • EC1: 'Comment on egusphere-2022-1138', Simone Pilia, 10 Jan 2023
    • AC1: 'Reply on EC1', Jordi Diaz, 10 Jan 2023

Jordi Diaz et al.


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Short summary
We assess the capability of multiple methods based on the interpretation of seismic noise to map the basement of the Cerdanya basin, located in the eastern Pyrenees. Basement depths estimations retrieved from the different approaches are consistent, with maximum depths reaching 700 m close to the Têt Fault bounding the basin to the east. Our results prove that seismic noise analysis using high-density networks is an excellent tool to improve the geological characterisation of sedimentary basins.