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Attenuation of coda waves in northern Greece

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Abstract

The single scattering model has been applied for the estimation of codaQ values for local earthquakes that occurred in northern Greece during the period 1983–1989 and recorded by the telemetered network of the Geophysical Laboratory of the University of Thessaloniki. CodaQ estimations were made for four frequency bands centered at 1.5 Hz, 3.0 Hz, 6.0 Hz and 12.0 Hz and for the lapse time windows 10–20 sec, 15–30 sec, 20–45 sec, 30–60 sec and 50–100 sec. The codaQ values obtained show a clear frequency dependence of the formQ c =Q 0 f n, whileQ 0 andn depend on the lapse time window.Q 0 was found equal to 33 andn equal to 1.01 for the time window of 10 to 20 sec, while for the other windowsQ 0 increased from 60 to 129, withn being stable, close to 0.75. This lapse time dependence is interpreted as due to a depth dependent attenuation. The high attenuation and the strong frequency dependence found are characteristic of an area with high seismicity, in agreement with studies in other seismic regions.

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  1. Geophysical Laboratory, Aristotelian University of Thessaloniki, GR 54006, Macedonia, Greece

    P. M. Hatzidimitriou

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Hatzidimitriou, P.M. Attenuation of coda waves in northern Greece. PAGEOPH 140, 63–78 (1993). https://doi.org/10.1007/BF00876871

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