Preprints
https://doi.org/10.5194/se-2021-32
https://doi.org/10.5194/se-2021-32

  19 Apr 2021

19 Apr 2021

Review status: a revised version of this preprint is currently under review for the journal SE.

Imaging crustal structures through a passive seismic imaging approach in a mining area in Saxony, Germany

Hossein Hassani1, Felix Hloušek1, Stefan Buske1, and Olaf Wallner2 Hossein Hassani et al.
  • 1Institut für Geophysik und Geoinformatik, TU Bergakademie Freiberg, 09599 Freiberg, Germany
  • 2Wismut GmbH, Jagdschänkenstraße 29, 09117 Chemnitz, Germany

Abstract. We have used several flooding induced microseismic events that occurred in an abandoned mining area to image geological structures close to the hypocentres in the vicinity of the mine. The events have been located using a migration-based localization approach. We used the recorded full waveforms of these localized microseismic events and have processed these passive source data as if they resulted from active sources at the known hypocentre location and origin time defined by the applied location approach. The imaging was then performed by using a focusing 3D prestack depth migration approach for the secondary P-wave arrivals. The needed 3D migration velocity model was taken from a recent 3D active (controlled-source) seismic survey in that area. We observed several clear and pronounced reflectors in our obtained 3D seismic image cube, some of them related to a major fault zone in that area and some correlating well with information from the nearby mining activities. We compared our results to the 3D seismic image cube obtained directly from the 3D active seismic survey and have found new structures with our approach that were not know yet, probably because of their steep dips which the 3D active seismic survey had not illuminated. The location of the hypocentres at depth with respect to the illumination angles of those structures proved to be favourable in that case, and our 3D passive image complements the 3D active seismic image in an elegant way thereby revealing new structures that cannot be imaged otherwise with surface seismic configurations alone.

Hossein Hassani et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on se-2021-32', Mehdi Zare , 01 May 2021
    • AC1: 'Reply on RC1', Hossein Hassani, 14 Jul 2021
  • RC1: 'Comment on se-2021-32', Mehdi Zare , 02 May 2021
    • AC1: 'Reply on RC1', Hossein Hassani, 14 Jul 2021
  • RC2: 'Comment on se-2021-32', Anonymous Referee #2, 17 May 2021
    • AC2: 'Reply on RC2', Hossein Hassani, 14 Jul 2021

Hossein Hassani et al.

Hossein Hassani et al.

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Short summary
We imaged some structures related to a major fault plane which have not been illuminated by a previously conducted 3D active seismic survey due to their large dip angles. The imaging procedure is conducted by using microearthquakes as seismic sources.