Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
What preceded the catastrophic reactivation of the Ľubietová landslide 1977?
Published online: 12 October 2015 Cook, E. R. (1985): A time series analysis approach to tree-ring standardization. PhD. Dissertation. - The Univ. of Arizona, Tucson, USA. Corona, C. - Lopez Saez, J. - Stoffel, M. (2014): Defining optimal sample size, sampling design and thresholds for dendrogeomorphic landslide reconstruction. - Quat. Geochronol. 22, 72-84. Lopez Saez, J. - Corona, C. - Stoffel, M. - Astrade, L. - Berger, F. - Malet, J. P. (2012): Dendrogeomorphic reconstruction of past landslide reactivation with seasonal precision: Bois Noir landslide, southern French Alps. - Landslides 9, 189-203. Nemčok, A. (1982): Zosuvy v Slovenských Karpatoch. - 319 str. Veda, Bratislava. Pánek, T. - Šilhán, K. - Tábořík, P. - Hradecký, J. - Smolková, V. - Lenárt, J. - Brázdil, R. - Kašičková, L. - Pazdur, A. (2011): Catastrophic slope failure and its origins: case of the May 2010 Girová Mountain long-runout rockslide (Czech Republic). - Geomorphology 130, 352-364. Petley, D. N. - Allison, R. J. (1997): The mechanics of deep-seated landslides. - Earth Surf. Proc. Land. 22, 747-758. Prokešová, R. - Kardoš, M. - Tábořík, P. - Medveďová, A. - Stacke, V. - Chudý, F. (2014): Kinematic behaviour of a large earthflow defined by surface displacement monitoring, DEM differencing, and ERT imaging. - Geomorphology 224, 86-101. Prokešová, R. - Medveďová, A. - Tábořík, P. - Snopková, Z. (2013): Towards hydrological triggering mechanisms of large deep-seated landslides. - Landslides, 10, 239-254. V.I.A.S. (2005): Time Table. Installation and instruction manual. Ver. 2.1. - Vienna Institute of Archaeological Science. Vienna.Abstract
The origin of many recent catastrophic landslides is commonly preceded by some minor movements. On the other hand, it is usual that large landslide events are followed by minor movements as well. Information about these movements is very important for assessment of potential landslide hazards or risks. Unfortunately, data on pre-landslide activity are very scarce (if any). Nevertheless, dendrogeomorphic methods can actually bring good results in this way. In our study the pre- and post-catastrophic activity of the Ľubietová landslide was studied. The landslide is 1200 m long and about 10–20 m deep. Catastrophic reactivation of this landslide occurred during February 1977. Trees with clearly visible signs of the previous landslide activity (tilted or bended stems) were sampled by Pressler increment borer in the area of 1977 source zone and in the position of old landslide blocks lying above the 1977 reactivation. A total of 19 individuals of Picea abies (L.) Karst. were sampled and samples were processed using a standard procedure. Twelve landslide reactivation events were dated (two of them, i.e. 1972 and 1974 were older than the main event in 1977). The activity of the superposed block was at least comparable with 1977 landslide prior to its movement. The question stays, why this area has remained outside the reactivation in1977? Moreover, the comparison of reconstructed chronology with precipitation record shows good conformity with some extremely wet seasons, although some events occurred in exceptionally dry seasons. Based on our results new questions emerged, which should be answered in the future at other localities using larger size of samples.References
