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Source Parameters and Seismic Moment–Magnitude Scaling for Northwestern Turkey

¹ GeoForschungsZentrum Potsdam
Telegrafenberg, 14473, Potsdam, Germany
 (S.P., H.G., C.M.)

² Istituto Nazionale di Geofisica e Vulcanologia
via Bassini 15, 20133 Milano, Italy
 (D.B.)

³ Bogazici University, Kandilli Observatory
Earthquake Research Institute
Department of Earthquake Engineering
34684, Cengelkoy, Istanbul, Turkey
 (E.D.)

The source parameters of 523 aftershocks (0.5 < M_L < 5.9) of the 1999 Kocaeli earthquake are determined by performing a two-step spectral fitting procedure. The source spectrum, corrected for both site and propagation effects, is described in terms of a standard -square model multiplied by an exponential term of frequency. The latter term is introduced to estimate the high-frequency (f > 12 Hz) fall-off of the acceleration source spectra by computing the parameter. The seismic moments obtained range between 1.05 x 10¹⁴ and 2.41 x 10¹⁷ N m, whereas the Brune stress drops are between 0.002 and 40 MPa. The value varies between 0.00 and 0.08 sec, indicating a decay of the acceleration level at the higher frequency part of the spectrum greater than that assumed by the ^–2 model. Both the stress drop and the parameter show the tendency of increasing with aftershock magnitude. No evidence of self-similarity breakdown is observed between the source radius and M₀. Finally, both the seismic moment and the moment magnitude are compared with the local magnitude to derive new moment–magnitude relationships for the area.

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