EGU22-6125, updated on 28 Mar 2022
https://doi.org/10.5194/egusphere-egu22-6125
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

In situ estimation of effective rock elastic moduli by seismic ambient vibrations

Jozef Müller1,2 and Jan Burjánek3
Jozef Müller and Jan Burjánek
  • 1Friedrich Schiller University Jena, Institute of Geosciences, Jena, Germany (jozef.mueller@uni-jena.de)
  • 2Charles University, Faculty of Science, Prague, Czechia
  • 3Institute of Geophysics of the Czech Academy of Science, Prague, Czechia (burjanek@ig.cas.cz)

In this study, we performed a non-invasive ambient noise investigation of unsaturated rock structures in the Bohemian Paradise (Bohemian Cretaceous Basin, Czech Republic). Our study focused on two key topics: 1) An in situ elastic moduli estimate of competent, horizontally deposited sandstone layers using ambient noise array measurements. Recordings were processed using an f-k array analysis, from which frequency-dependent Love and Rayleigh wave dispersion curves, as well as Rayleigh wave ellipticity, were retrieved. Data were inverted for the P- and S-wave velocity profiles, from which Young’s and shear moduli were successfully estimated. 2) A study of the local response of the Kapelník rock tower. We analysed a dataset of ambient noise recordings obtained from the top of the tower and its foot. Information regarding tower oscillation frequencies and directions, together with amplification ratios, were retrieved from a particle motion polarisation analysis and from site-to-reference spectral ratios. Euler-Bernoulli beam theory was also employed for interpreting measured data using elastic moduli estimated from noise array measurements.

How to cite: Müller, J. and Burjánek, J.: In situ estimation of effective rock elastic moduli by seismic ambient vibrations, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-6125, https://doi.org/10.5194/egusphere-egu22-6125, 2022.

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