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

作　　者：ZHAO Zhixin ZHAO Zhao XU Jiren Ryuji Kubota 

机构地区：[1]Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China [2]Konica Minolta, Tokyo 192-8505, Japan [3]Kawasaki Geological Engineering Co., Ltd., Tokyo, 2-11-15 Mita Minato-ku, Tokyo 108-8337, Japan

出　　处：《Chinese Science Bulletin》2006年第24期3018-3025,共8页

基　　金：Acknowledgements This work was supported by National Basic Research Program of China （Grant No. 2003CB716505） and the National Natural Science Foundation of China （Grant No. 40399141）.

摘　　要：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 hybrid empirical Green＇s function 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 earthquake were calculated by solving wave equation using 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 between 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 synthetic seismograms of the target earthquake were performed based on the model with multiple source rupture processes. The results suggest that synthesized 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 motion in region without observed seismic waveforms. The present technique spreads application field of the empirical Green＇s function method.

关 键 词：合成地震图 地震波形 地面运动 震源断层 模拟Green函数法 

分 类 号：P315.31[天文地球—地震学]