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| Titel |
Anisotropy of attenuation of high-frequency body waves in the External Dinarides |
| VerfasserIn |
Iva Dasović, Davorka Herak, Marijan Herak |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250145328
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| Publikation (Nr.) |
 EGU/EGU2017-9260.pdf |
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| Zusammenfassung |
| The Dinarides are a part of the complex Alpine–Carpathian–Dinaric orogenic system. They
formed as a result of the push of the African plate and a collision of the Adriatic microplate
with the European plate. The External Dinarides represent western part of the Dinarides
derived from the Adriatic microplate, i.e. the Adriatic carbonate platform. They are
characterised by NW trend and SW vergence of compressional and imbricated
structures. Recent seismicity in the area varies from moderate to high with rare
occurrence of strong earthquakes. Prevailing compressional stresses result in mainly
reverse faulting, with or without a dextral strike-slip component. This area represents
one of the geologically and tectonically most complicated and puzzling regions in
Europe.
We used local earthquakes recorded at broadband seismic stations of the Croatian
seismological network to analyse attenuation of high-frequency body waves. To
estimate attenuation of P- and S-waves, i.e. the quality factors QP and QS, we
applied the extended coda normalization method. These quality factors reflect the
total attenuation of the direct body waves in the crust. The results indicate strong
attenuation of P- and S- waves. Moreover, further analysis of the Q-factors indicates
existence of anisotropy in seismic attenuation, with higher attenuation in the direction
perpendicular to the strike of the Dinarides and lower attenuation parallel to it. |
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