Rupture model of the 1999 Düzce, Turkey, earthquake deduced from high and low frequency strong motion data

(1) We investigated the rupture process of the 1999 Duzce Earthquake by applying the multi time-window linear waveform inversion method to low-frequency ground motions (0.5 Hz) in the near source area. Then, we performed theforwardmodellingofhigherfrequencyground motions (0.3-10.0 Hz) by the Empirical Green's Function (EGF) method to image the strong motion generation area (SMGA). We also examined the source model to check whether the supershear phenomenon occurred inside the asperities or not. Slip distribution model from the inversion suggests 2 asperities. The maximum slip is obtained as 5 m near the hypocenter. The high first time window front propagation velocity (FTWFPV) and consequently, high apparent rupture velocity found from the investigation of rupture progression indicated that eastern propagation partially showed supershear behaviour. The EGF simulation, which identifies an average rupture velocity (Vr) in SMGA, supports this finding. INDEX TERMS: 7212 Seismology: Earthquake ground motions and engineering; 7215 Seismology: Earthquake parameters; 7223 Seismology: Seismic hazard assessment and prediction. Citation: Birgoren, G., H. Sekiguchi, and K. Irikura (2004), Rupture model of the 1999 Duzce, Turkey, earthquake deduced from high and low frequency strong motion data, Geophys. Res. Lett., 31, L05610, doi:10.1029/ 2003GL019194.