Catastrophic slope failure and its origins: Case of the May 2010 Girová Mountain long-runout rockslide (Czech Republic)

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Authors

PÁNEK Tomáš ŠILHÁN Karel TÁBOŘÍK Petr HRADECKÝ Jan SMOLKOVÁ Veronika LENART Jan BRÁZDIL Rudolf KAŠIČKOVÁ Lucie PAZDUR Anna

Year of publication 2011
Type Article in Periodical
Magazine / Source Geomorphology
MU Faculty or unit

Faculty of Science

Citation
Doi http://dx.doi.org/10.1016/j.geomorph.2011.04.020
Field Earth magnetism, geography
Keywords Recurrent catastrophic landslide; deep-seated gravitational slope deformation; radiocarbon dating; dendrogeomorphology; flysch; Outer Western Carpathians
Description The structurally predisposed May 2010 Girová Mountain rockslide is an excellent case of a recurrent long-runout landslide nested within a deep-seated gravitational slope deformation with a long history of Late Quaternary mass movements. The chronology of slope failures within the studied slope was reconstructed by means of radiocarbon dating and dendrogeomorphological analysis. At least one Holocene long-runout landslide (7.4 cal ka BP) and several smaller failures (~1.5 and ~0.6 cal ka BP) preceded this recent catastrophic failure. Dendrogeomorphological analysis showed that the failure had been preceded by at least 80-year-long creep movement that accelerated over the years due to extreme rainfall events. Despite the fact that extreme precipitation of May 2010 represented the last incremental change before catastrophic collapse of the slope, its main reason was gradual weakening of rock massif and concentrated creeping (with some accelerated phases) in the upper part of the slope deformation.
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