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Ambient Seismic Noise Tomography of a Loess High Bank at Dunaszekcső (Hungary)
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SYSNO ASEP 0464924 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Ambient Seismic Noise Tomography of a Loess High Bank at Dunaszekcső (Hungary) Author(s) Szanyi, G. (HU)
Gráczer, Z. (HU)
Györi, E. (HU)
Kaláb, Zdeněk (UGN-S) RID
Lednická, Markéta (UGN-S) RID, ORCIDNumber of authors 5 Source Title Pure and Applied Geophysics. - : Springer - ISSN 0033-4553
Roč. 173, č. 8 (2016), s. 2913-2928Number of pages 16 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords seismic interferometry ; ambient noise ; group velocity ; tomography ; landslide ; high bank Subject RIV DC - Siesmology, Volcanology, Earth Structure Institutional support UGN-S - RVO:68145535 UT WOS 000381406600022 EID SCOPUS 84981164258 DOI 10.1007/s00024-016-1304-1 Annotation Loess high banks along the right side of the Danube in Hungary are potential subjects of landslides. Small scale ambient seismic noise tomography was used at the Dunaszekcső high bank. The aim of the study was to map near surface velocity anomalies since we assume that the formation of tension cracks—which precede landslides—are represented by low velocities. Mapping Rayleigh wave group velocity distribution can help to image intact and creviced areas and identify the most vulnerable sections. The study area lies at the top of the Castle Hill of Dunaszekcső, which was named after Castellum Lugio, a fortress of Roman origin. The presently active head scarp was formed in April 2011, and our study area was chosen to be at its surroundings. Cross-correlation functions of ambient noise recordings were used to retrieve the dispersion curves, which served as the input of the group velocity tomography. Phase cross-correlation and time-frequency phase weighted stacking was applied to calculate the cross-correlation functions. The average Rayleigh wave group velocity at the loess high bank was found to be 171 ms−1. The group velocity map at a 0.1 s period revealed a low-velocity region, whose location coincides with a highly creviced area, where slope failure takes place along a several meter wide territory. Another low velocity region was found, which might indicate a previously unknown loosened domain. The highest velocities were observed at the supposed remnants of Castellum Lugio. Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2017 Electronic address http://link.springer.com/article/10.1007/s00024-016-1304-1
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