Attenuation of shear-waves in the back-arc region of the Hellenic arc for frequencies from 0.6 to 16 Hz |
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| Authors: | Antonis Polatidis Anastasia Kiratzi Panagiotis Hatzidimitriou Basil Margaris |
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| Institution: | a Department of Geophysics, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece;b Institute of Engineering Seismology and Earthquake Engineering, P.O. Box 53, 55102, Thessaloniki, Greece |
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| Abstract: | Qβ for shear-waves is determined for the inner part of the Hellenic arc, the back-arc area, as a function of frequency in the range 0.6–16 Hz. We used 314 digital records from 32 earthquakes with magnitudes (Mw) ranging from 3.9 to 5.1. Epicentral distances ranged from 65 to 515 km. The data were obtained in 1997 during a 6-month operation of a digital portable network in Greece. The Qβ estimates were made for five frequency bands centred at 0.8, 1.5, 3.0, 6.0 and 12.0 Hz and the Qβ values obtained were 47, 79, 143, 271 and 553, respectively. The results show that Qβ for S-waves increases with frequency taking the form Qβ=55f 0.91 (or Qβ−10.018f−0.91). The high attenuation and the strong frequency dependence found, which is close to the frequency dependence of coda Q for Greece, are characteristic of an area with high seismicity, rapid extension, and in agreement with other similar studies in Greece. |
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| Keywords: | Attenuation S-waves Aegean Sea Greece Q Coda-waves |
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