Preprints
https://doi.org/10.5194/se-2021-33
https://doi.org/10.5194/se-2021-33

  12 Apr 2021

12 Apr 2021

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

Moho and uppermost mantle structure in the greater Alpine area from S-to-P converted waves

Rainer Kind1,2, Stefan M. Schmid3, Xiaohui Yuan2, Ben Heit2, Thomas Meier4, and the AlpArray and AlpArray-SWATH-D Working Groups Rainer Kind et al.
  • 1Freie Universität Berlin, Berlin
  • 2Deutsches GeoForschungsZentrum GFZ, 14473 Potsdam
  • 3Eidgenössische Technische Hochschule Zürich
  • 4Christian-Albrechts-Universität zu Kiel
  • A full list of authors appears at the end of the paper.

Abstract. In the frame of the AlpArray project we analyze teleseismic data from permanent and temporary stations of the greater Alpine region to study seismic discontinuities down to about 140 km depth. We average broadband teleseismic S waveform data to retrieve S-to-P converted signals from below the seismic stations. In order to avoid processing artefacts, no deconvolution or filtering is applied and S arrival times are used as reference. We show a number of north-south and east-west profiles through the greater Alpine area. The Moho signals are always seen very clearly, and also negative velocity gradients below the Moho are visible in a number of profiles. A Moho depression is visible along larger parts of the Alpine chain. It reaches its largest depth of 60 km beneath the Tauern Window. The Moho depression ends however abruptly near about 13° E below the eastern Tauern Window. The Moho depression may represent the mantle trench, where the Eurasian lithosphere is subducted below the Adriatic lithosphere. East of 13° E an important along-strike change occurs; the image of the Moho changes completely. No Moho deepening is found in this easterly region; instead the Moho is updoming along the contact between the European and the Adriatic lithosphere all the way into the Pannonian Basin. An important along strike change was also detected in the upper mantle structure at about 14° E. There, the lateral disappearance of a zone of negative P-wave velocity gradient indicates that the S-dipping European slab laterally terminates east of the Tauern Window in the axial zone of the Alps. The area east of about 13° E is known to have been affected by severe late-stage modifications of the structure of crust and uppermost mantle during the Miocene when the ALCAPA (Alpine, Carpathian, Pannonian) block was subject to E-directed lateral extrusion.

Rainer Kind 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-2021-33', Anonymous Referee #1, 07 May 2021
    • AC1: 'Reply on RC1', Rainer Kind, 13 Jul 2021
  • RC2: 'Peer-review of ms. SE-2021-33 by Kind et al.', Anonymous Referee #2, 01 Jun 2021
    • AC2: 'Reply on RC2', Rainer Kind, 13 Jul 2021

Rainer Kind et al.

Rainer Kind et al.

Viewed

Total article views: 512 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
383 113 16 512 29 7 3
  • HTML: 383
  • PDF: 113
  • XML: 16
  • Total: 512
  • Supplement: 29
  • BibTeX: 7
  • EndNote: 3
Views and downloads (calculated since 12 Apr 2021)
Cumulative views and downloads (calculated since 12 Apr 2021)

Viewed (geographical distribution)

Total article views: 469 (including HTML, PDF, and XML) Thereof 469 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 30 Jul 2021
Download
Short summary
A large amount of new seismic data from the greater Alpine area have been obtained within the AlpArray and SWATH-D projects. S-to P converted seismic phases from the Moho and from the mantle lithosphere have been processed with a newly developed method. Examples of new observations are a rapid change in Moho depth at 13° E below the Tauern Window from 60 km in the west to 40 km in the east and a second Moho trough along the boundary of the Bohemian Massif towards the Western Carpathians.