EGU2020-6842, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-6842
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Upper crustal structure at the KTB drilling site from ambient noise tomography

Ehsan Qorbani1, Irene Bianchi2, Petr Kolínský2, Dimitri Zigone3, and Götz Bokelmann2
Ehsan Qorbani et al.
  • 1CTBTO, International Data Center, Vienna, Austria (eqorbani@gmail.com)
  • 2Department of Meteorology and Geophysics, University of Vienna, Austria
  • 3Institut de Physique du Globe de Strasbourg, EOST, Strasbourg University/CNRS, Strasbourg, France

In this study, we show results from ambient noise tomography at the KTB drilling site, Germany. The Continental Deep Drilling Project, or ‘Kontinentales Tiefbohrprogramm der Bundesrepublik Deutschland’ (KTB) is at the northwestern edge of the Bohemian Massif and is located on the Variscan belt of Europe. During the KTB project crustal rocks have been drilled down to 9 km depth and several active seismic studies have been performed in the surrounding. The KTB area therefore presents an ideal test area for testing and verifying the potential resolution of passive seismic techniques. The aim of this study is to present a new shear-wave velocity model of the area while comparing the results to the previous velocity models and hints for anisotropy depicted by former passive and active seismological studies. We use a unique data set composed of two years of continuous data recorded at nine 3-component temporary stations installed from July 2012 to July 2014 located on top and vicinity of the drilling site. Moreover, we included a number of permanent stations in the region in order to improve the path coverage and density. Cross correlations of ambient noise are computed between the station pairs using all possible combination of three-component data. Dispersion curves of surface waves are extracted and are then inverted to obtain group velocity maps. We present here a new velocity model of the upper crust of the area, which shows velocity variations at short scales that correlate well with geology in the region.

How to cite: Qorbani, E., Bianchi, I., Kolínský, P., Zigone, D., and Bokelmann, G.: Upper crustal structure at the KTB drilling site from ambient noise tomography, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-6842, https://doi.org/10.5194/egusphere-egu2020-6842, 2020

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Display material version 2 – uploaded on 28 Apr 2020
very minor change in the text, last slide.
  • CC1: Comment on EGU2020-6842, Carolin Boese, 04 May 2020

    Good morning, how do these Vp/Vs results compare with the velocity logs from KTB mainhole? Thank you

    • AC1: Reply to CC1, Ehsan Qorbani, 04 May 2020

      Thanks for the question. We present here a Vs model for the area and have not compared yet with velocity log of the site. We will for sure make this comparison with our profiles BB' (in slide#8), which crosses the drilling site. 

      Best, Ehsan

Display material version 1 – uploaded on 28 Apr 2020, no comments