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Mid-European seismic attenuation anomaly
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SYSNO ASEP 0481967 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Mid-European seismic attenuation anomaly Author(s) Málek, Jiří (USMH-B) RID, ORCID, SAI
Brokešová, J. (CZ)
Vackář, Jiří (USMH-B) ORCID, RIDSource Title Tectonophysics. - : Elsevier - ISSN 0040-1951
Roč. 712, AUG 21 (2017), s. 557-577Number of pages 21 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords seismic wave attenuation ; peak ground motion ; H/V ratio Subject RIV DC - Siesmology, Volcanology, Earth Structure OECD category Geology Institutional support USMH-B - RVO:67985891 UT WOS 000409284500041 EID SCOPUS 85021725697 DOI 10.1016/j.tecto.2017.06.003 Annotation Macroseismic studies of various historical earthquakes with epicenters in the Eastern Alps region have shown a significant elongation of isoseismals in the North-West direction. Such an anomalous attenuation of seismic waves in Central Europe is investigated on the basis of instrumental records of two moderate size earthquakes in the Vienna Basin, which occurred in September and October 2013. It has been found that for both earthquakes the peak amplitudes of both velocity and acceleration are considerably higher to the North-West of the epicenters compared to the other directions. The peak ground velocity amplitudes at comparable epicentral distances but different azimuths may vary by as much as one order of magnitude. The inspection of individual seismograms suggests that the phenomenon is associated mainly with the propagation of S waves. Significant differences in frequency content of the seismic waves radiated to different azimuths are also demonstrated. The maximum predominant frequency was not observed at stations closest to the epicenters but about 250 km away, in the Bohemian Massif. The possible causes of these observations are briefly discussed on the basis of an elementary data analysis but further research and in-depth analysis is required to elucidate the causes of these phenomena. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2018
Number of the records: 1