Abstract
Strong-motion accelerograms are used for the estimation of attenuation coefficient in the upper crust in Greece, on the assumption that direct S-waves are responsible for the strong near-source motion. This coefficient was then used to derive a calibration formula for the estimation of local earthquake magnitude for epicentral distances Δ < 130 km and 4.0 ≤ M L ≤ 6.1. Q s values are calculated by the spectral decay of the log spectrum of the accelerograms. The resulting values exhibit the high attenuation of seismic waves in Greece and indicate the existence of a highly attenuative surface “sedimentary” layer which strongly controls the total wave attenuation.
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