de.pangaea.dataset930254 und dataset PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact 2026-04-30T21:45:54Z https://doi.pangaea.de/10.1594/PANGAEA.930254 2021-04-13T05:56:37 publication https://doi.org/10.1594/PANGAEA.930254 Szczygieł, Jacek

jacek.szczygiel@us.edu.pl

https://orcid.org/0000-0002-6527-1632 information author Mendecki, Maciej https://orcid.org/0000-0003-0952-3302 information author PANGAEA

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https://www.pangaea.de/ information publisher tableDigital Multiphase speleothem damage and passage collapse in Niedźwiedzia Cave (E: 16°50′36,65″, N: 50°14′04,26″) NE Bohemian Massif, Poland, were studied with an integrative approach to decipher the cause of damage during the last 320 ka. Since the most likely trigger of damage in the cave was an earthquake, we support our interpretation with a probable seismic intensity prediction to define a seismogenic source and to calculate the expected macroseismic intensity and peak ground acceleration (PGA) at the research site. Finally, we evaluate probable seismic effects in the cave with the elastic properties of speleothems to ascertain a threshold value of failure. The relative range of earthquake hazards for a particular site depends significantly on the decrease in the ground motion amplitude (or intensity) with distance from all surrounding potential seismic sources, event size, and type of acting mechanism. The ground motion relation generally depends on the depth of focus, earthquake mechanism, and geological conditions along the path (Schenková et al., 1981). Therefore, to discuss probable seismic effects in Niedźwiedzia caves and their vicinities, we used the attenuation curves presented previously for the research area (Schenková et al., 1981; see the coefficient for the 13th zone). Dataset 2020TC006459_ds_to fig.5 contains a calculation of the attenuation curves, i.e., decrees of the intensity (on the MSK scale) and PGA (m/s2) with distance from the epicenter. We used these data to estimate (or to predict) the expected values of intensities ranging with distance from the seismogenic source region. This approach is a steady-state approximation because we assumed that isoseismal spread is regularly distributed around the epicenter and that the local influence of discontinuities is omitted. The failure criteria resulting in speleothem damage were evaluated on a prismatic cantilever beam supported at one end. The parameters describing these criteria are the speleothem natural frequency and the corresponding critical horizontal ground acceleration (m/s2), which depend on elastic properties of the speleothem and the following geometric dimensions: height, H, and diameter, D, measured in situ (we acquired geometric measurements for 50 broken speleothems in Niedźwiedzia Cave). The horizontal ground acceleration is the limit value when at which speleothems breaks. The natural frequency (Hz) indicates that the failure process is more likely to occur if the natural frequency (or resonance frequency) is in accordance with the seismic wave frequency affecting the speleothem. If both frequencies match, the speleothem resonates, enhancing the oscillation effect, which may lead to damage. Dataset 2020TC006459_ds_to fig.6 contains H and D measurements of 50 broke speleothems and calculated natural frequency and critical horizontal ground acceleration for each measured speleothem. The values of both failure parameters depend on elastic properties that can be assessed in laboratory tests in which the following parameters are estimated: P- and S-wave velocities, Vp and Vs, respectively, using an acoustic measurement system, density, ρ, (from the measured mass and volume), Young's modulus, E, and tensile stress, σt. The AMS tests were carried out at the Institute of Earth Sciences, University of Silesia, Sosnowiec, Poland. The failure stress was estimated based on the uniaxial compressive stress test carried out in the external laboratory of AP GEOTECHNIKA, Katowice, Poland, using a universal testing machine. The strength tests were conducted for two 0.05x0.05 m (height/dimension, h/d = 1) speleothems samples. completed Szczygieł, Jacek

jacek.szczygiel@us.edu.pl

https://orcid.org/0000-0002-6527-1632 information principalInvestigator ground motion model paleoseismology Speleoseismology theme 1995-01-01 creation PANGAEA

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https://www.pangaea.de/ information pointOfContact SPELEOTHEMS Analysis of deformed speleothems from the Niedźwiedzia Cave in Kletno (Sudetes) as paleoseismic research tool theme 1995-01-01 creation PANGAEA

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https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation 16.843514 16.843514 50.234517 50.234517 File content thematicClassification Binary Object thematicClassification text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.930254?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: Niedzwiedzia_Cave * LATITUDE: 50.234517 * LONGITUDE: 16.843514 * LOCATION: Bohemian Massif, Poland * METHOD/DEVICE: Speleothem sample Supplement to 2021-01-01 publication https://doi.org/10.1029/2020TC006459 Szczygieł, Jacek

jacek.szczygiel@us.edu.pl

https://orcid.org/0000-0002-6527-1632 information author Sobczyk, Artur https://orcid.org/0000-0003-3829-561X information author Hercman, Helena https://orcid.org/0000-0002-3851-431X information author Mendecki, Maciej https://orcid.org/0000-0003-0952-3302 information author Gąsiorowski, Michał https://orcid.org/0000-0003-2610-4257 information author documentDigital Tectonics 40(3) Further details 1981-01-01 publication https://doi.org/10.1007/BF00878971 Schenková, Zdeňka author Schenk, Vladimír author Kárník, Vít author documentDigital Pure and Applied Geophysics 119(5) 1077-1092