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Measurements and modeling of the post-failure micro-deformations and tilts of the Preonzo unstable slope, Alpe di Roscioro, Switzerland

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    SYSNO ASEP0542058
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleMeasurements and modeling of the post-failure micro-deformations and tilts of the Preonzo unstable slope, Alpe di Roscioro, Switzerland
    Author(s) Opršal, Ivo (GFU-E) ORCID, RID
    Thun, Johannes (GFU-E) ORCID
    Burjánek, Jan (GFU-E) ORCID, RID
    Fäh, D. (CH)
    Article number105919
    Source TitleEngineering Geology. - : Elsevier - ISSN 0013-7952
    Roč. 280, January (2021)
    Number of pages14 s.
    Publication formPrint - P
    Languageeng - English
    CountryNL - Netherlands
    Keywordsrock slope instability ; finite difference modeling ; directional deformations ; micro deformations ; micro tilt ; data mining
    Subject RIVDC - Siesmology, Volcanology, Earth Structure
    OECD categoryVolcanology
    Method of publishingOpen access
    Institutional supportGFU-E - RVO:67985530
    UT WOS000615526300010
    EID SCOPUS85097090130
    DOI10.1016/j.enggeo.2020.105919
    AnnotationThe Alpe di Roscioro, is a site of an unstable rock slope located above the village of Preonzo in southern Switzerland. There have been numerous rock-slope failures with a major event that happened in May 2012. After that event, several seismic stations were set up at the site of the remaining highly fractured and unstable rock mass. The analysis of continuous seismic recordings has shown a high number of permanent micro-deformations and tilts, recorded by a seismometer located on top of the unstable part of the slope. In terms of the ground motion, the directions of these disturbances are parallel to the mean strike of the mapped fracture network, implying a connection to the ongoing deformations of the rock mass. The static deformation field of the fractured rock mass is modeled by finite-difference method (FD). The FD method enables us to apply a reciprocal approach by tilting the affected body of block 1, closest to the stable massif, by measured values and observing the deformations below the seismometer and in the neighboring blocks. The numerical model explains the following features observed in situ: feature 1. The combination of the horizontal displacement and tilt observed approximately at the same measurement point, feature 2. The block 1 center of rotation is shifted towards SSE by similar to 10 m off its center, feature 3. The sensors placed on the stable massif did not record any micro-deformation and tilt signals above the background noise. In the light of the numerical modeling, the weak coupling between the micro-tilt active block 1 and neighboring media explains the absence of detected events in the reference stations placed on the stable massif. The simplified shear and bending force system FD model, indicates that the aftermath of the May 2012 main failure consisted of numerous episodic elementary relaxations of the SSE part of block 1 after the collapse of its NNW compartment, which was previously connected to it.
    WorkplaceGeophysical Institute
    ContactHana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028
    Year of Publishing2022
    Electronic addresshttps://www.sciencedirect.com/science/article/pii/S0013795220318160
Number of the records: 1  

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