Speaker
Dr
Wojciech Wroblewski
(Institute of Geological Sciences, Jagiellonian University)
Description
Soft sediment deformation were recognized within poorly-lithified Upper Pleistocene siliciclastic deposits, filling one of the cave passage in Kalacka Cave in Tatra Mts (southern Poland). Structural analysis revealed that soft sediment deformations are represented by micro faults and micro folds (disharmonic folds, fault-bend folds, upright anticlines), water escape structures, and load structures. Laboratory tests based on acoustic measurements (S-wave velocities and densities of siliciclastic deposits and host rock) and calculations (amplification coefficient and resonance frequency) demonstrated that soft sediment deformation developed in result of sediment liquefaction. Obtained values of vulnerability index (Kg>5) and resonance frequency (ca. 17.5 Hz) suggest sediment liquefaction could been involved by ground shaking, which in case of study area resulting from rock mass relaxation.
Primary author
Dr
Jacek Szczygieł
(Department of Fundamental Geology, Faculty of Earth Sciences, University of Silesia)
Co-authors
Mr
Maciej Mendecki
(Faculty of Earth Sciences, University of Silesia)
Dr
Wojciech Wroblewski
(Institute of Geological Sciences, Jagiellonian University)
