Abstract
SUMMARY The seismic source parameters seismic moment M,, source dimension r, fault length 1, average displacement (u), shear-stress drop Aa, radiated energy Es, and apparent stress n( a) are calculated for the Kalamata (southern Greece) earthquake of 1986 September 13. These source parameters are obtained by using teleseismic P and SH-wave spectra and making use of three independent spectral parameters, the long period spectral level a,, the corner frequency f,, and the parameter E which controls the high-frequency decay of the displacement spectrum. The calculated far-field spectra are based on the direct phases of Pand S-waves and they have been corrected for the instrumental response and for an average radiation pattern assuming normal faulting mechanism. The striking feature of the obtained results is the low stress drop value of about 6-7 bar which is in deviation from the average value (30 bar) for interplate earthquakes. A seismic moment of 1.9 x and 2.2 x loz4 dyne - cm, a fault length of about 22 and 11 km, and an average displacement.of 15 and 9 cm are obtained on the basis of P- and S-waves, respectively.
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