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《Chinese Quarterly of Mechanics》 2010-03
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Comparison of Two Methods of Ground Motion Inversion and Discussion on Question of Frequency Cut-off

CHEN Qing-jun,LIU Tuo (State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)  
It is a key step to determine the bedrock earthquake motion in the analysis of site seismic response and soil-structure dynamic interaction.Two methods of ground motion inversion of shear wave propagation and finite element were compared,and the question of frequency cut-off in ground motion inversion of soil layer with deep deposit was discussed.Then,two methods were applied to a representative site with deep deposit in Shanghai,the acceleration transfer functions from different subterranean levels (including layers below the surface 10m,20m,45m,140m and 280m) to the surface were calculated and compared.The results show that the transfer function modulus of deep soil-layer are close to zero in higher frequencies.Finally,the acceleration records from El Centro and TCU115 terminal station(for it is long period seismic wave) in CHI-CHI earthquake were chosen as the ground motions,and the question of frequency cut-off under El Centro wave and long period TCU115 wave was analyzed,and the bedrock waves below the surface 280 m was obtained.
【Fund】: 科技部国家重点实验室基础研究资助项目(SLDRCE08-B-03);; 国家自然科学基金资助(50978198)
【CateGory Index】: P315.31
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