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Mid-European seismic attenuation anomaly

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    SYSNO ASEP0481967
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleMid-European seismic attenuation anomaly
    Author(s) Málek, Jiří (USMH-B) RID, ORCID
    Brokešová, J. (CZ)
    Vackář, Jiří (USMH-B) ORCID, RID
    Source TitleTectonophysics. - : Elsevier - ISSN 0040-1951
    Roč. 712, AUG 21 (2017), s. 557-577
    Number of pages21 s.
    Publication formPrint - P
    Languageeng - English
    CountryNL - Netherlands
    Keywordsseismic wave attenuation ; peak ground motion ; H/V ratio
    Subject RIVDC - Siesmology, Volcanology, Earth Structure
    OBOR OECDGeology
    Institutional supportUSMH-B - RVO:67985891
    UT WOS000409284500041
    EID SCOPUS85021725697
    DOI10.1016/j.tecto.2017.06.003
    AnnotationMacroseismic 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.
    WorkplaceInstitute of Rock Structure and Mechanics
    ContactMagdalena Nováková, lib@irsm.cas.cz, Tel.: 266 009 215
    Year of Publishing2018
Number of the records: 1