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《Chinese Journal of Geophysics》 2013-01
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The distortion of seismic imaging in the presence of mesoscale eddies and analysis of influencing factors

JI Li-Li,LIN Mian* Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China  
Combined with seismic simulation methods,the parabolic equation method is used to investigate the distortion of seismic imaging of the target stratum caused by mesoscale eddies.Seismic wave fields for different frequencies and water depth are simulated.It is found that the seismic imaging of the target stratum,due to the perturbation of eddies,does not agree with the original stratum and the distortions increase with the water depth and the frequency.Analyzing the mechanism of distortions,we have concluded that the perturbation of temperature gradient caused by eddies is one of the most important reasons.For the sake of ingineering application,we deduce a relationship among the maximum distorted rate of seismic imaging,the temperature difference and the effective intensity of eddies.The results of this paper could be used to improve the quality of seismic imaging in deep sea.
【Fund】: 国家自然科学基金项目(41074097);; 国家重点基础研究计划(973)(2009CB219405-1)联合资助
【CateGory Index】: P714
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