Synthetic seismograms of ground motion near earthquake fault using simulated Green's function m

来源 :Chinese Science Bulletin | 被引量 : 0次 | 上传用户:mimistart
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Seismograms near source fault were synthesized using the hybrid empirical Green’s func-tion method where the discretely simulated seismic waveforms are used for Green’s functions instead of the observed waveforms of small earthquakes. The Green’s function seismic waveforms for small earth-quake were calculated by solving wave equation us-ing the pseudo-spectral method with the staggered grid real FFT strategy under a detailed 2-D velocity structure in Kobe region. Magnitude and seismic moment of simulated Green’s function waveforms were firstly determined by using the relationship be-tween fault length and corner frequency of source spectrum. The simulated Green’s function waveforms were employed to synthesize seismograms of strong ground motion near the earthquake fault. The syn-thetic seismograms of the target earthquake were performed based on the model with multiple source rupture processes. The results suggest that synthe-sized seismograms coincide well with observed seismic waveforms of the 1995 Hyogo-ken Nanbu earthquake. The simulated Green’s function method is very useful for prediction of the strong ground mo-tion in region without observed seismic waveforms. The present technique spreads application field of the empirical Green’s function method. Seismograms near source fault were synthesized using the hybridization Green’s func-tion method where the discretely simulated seismic waveforms are used for Green’s functions instead of the observed waveforms of small earthquakes. The Green’s function seismic waveforms for small earth-quake were calculated by solving wave equation us-ing the pseudo-spectral method with the staggered grid real FFT strategy under a detailed 2-D velocity structure in Kobe region. Magnitude and seismic moment of simulated Green’s function waveforms were evaluated by using the relationship be-tween fault length and corner frequency of source spectrum. The simulated Green’s function waveforms were employed to synthesize seismograms of the target earthquake were performing based on the model with multiple source rupture processes. The results suggest that synthe-sized seismograms coincide well with observed sei smic waveforms of the 1995 Hyogo-ken Nanbu earthquake. The simulated Green’s function method is very useful for prediction of the strong ground mo-tion in the region without observed seismic waveforms. The present technique spreads application field of the empirical Green’s function method.
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