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On the seismic response of instable rock slopes based on ambient vibration recordings

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    0478792 - GFÚ 2018 RIV DE eng J - Journal Article
    Kleinbrod, U. - Burjánek, Jan - Fäh, D.
    On the seismic response of instable rock slopes based on ambient vibration recordings.
    Earth, Planets and Space. Roč. 69, September (2017), č. článku 126. E-ISSN 1880-5981
    Institutional support: RVO:67985530
    Keywords : ambient vibrations * instable rock slopes * site amplification
    OECD category: Volcanology
    Impact factor: 2.773, year: 2017

    Rock slope failures can lead to huge human and economic loss depending on their size and exact location. Reasonable hazard mitigation requires thorough understanding of the underlying slope driving mechanisms and its rock mass properties. Measurements of seismic ambient vibrations could improve the characterization and detection of rock instabilities since there is a link between seismic response and internal structure of the unstable rock mass. An unstable slope near the village Gondo has been investigated. The unstable part shows strongly amplified ground motion with respect to the stable part of the rock slope. The amplification values reach maximum factors of 70. The seismic response on the instable part is highly directional and polarized. Re-measurements have been taken 1 year later showing exactly the same results as the original measurements. Neither the amplified frequencies nor the amplification values have changed. Therefore, ambient vibration measurements are repeatable and stay the same, if the rock mass has not undergone any significant change in structure or volume, respectively. Additionally, four new points have been measured during the re-measuring campaign in order to better map the border of the instability.
    Permanent Link: http://hdl.handle.net/11104/0274847

     
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