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《Chinese Journal of Geophysics》 2018-03
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Calculating the propagation of airgun source in a limited water body using the back-projection method

HU JiuPeng;WANG WeiTao;WANG BaoShan;CHEN Yong;JIANG ShengMiao;Institute of Geophysics,China Earthquake Administration(Seismic Observation and Geophysical Imaging Laboratory);School of Earth Sciences and Engineering,Nanjing University;  
The large volume airgun source can be applied to probing geophysical structure and changes on regional scales.But so far it still lacks of a solid theoretical model to characterize the propagation features of the land air-gun signal due to the complexity of the water-solid boundary.The research on air-gun in a limited land water body can further understanding of the physical mechanism of the airgun and the principle of different earthquake phases distribution.As a method to image earthquake rupture,back-projection can provide qualified results with a fewkinetic parameters. We present a modified back-projection method to simulate the energy distribution of the air-gun source located in a land limited water body. We decompose the excitation of airgun into five simplified physical processes,and establish numerical models for each process to calculate its theoretical wave field,which is used as input data of the new method.Numerical calculations show that this new method is able to capture the evolution of the wave field and characterize the distribution of the source energy.We also find that enough reasonably arranged hydrophones can help achieve better results.This method provides a new approach to quickly evaluate the effectiveness of land airgun and to further understanding of the airgun features.
【Fund】: 国家自然科学基金重大项目(41790463);国家自然科学基金(41574052 41674058);; 地震行业专项(201508008);; 中央公益类科研院所基本科研业务专项(DQJB16A01)资助
【CateGory Index】: P631.4
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【Citations】
Chinese Journal Full-text Database 9 Hits
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【Co-citations】
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1 HU JiuPeng;WANG WeiTao;WANG BaoShan;CHEN Yong;JIANG ShengMiao;Institute of Geophysics,China Earthquake Administration(Seismic Observation and Geophysical Imaging Laboratory);School of Earth Sciences and Engineering,Nanjing University;;Calculating the propagation of airgun source in a limited water body using the back-projection method[J];地球物理学报;2018-03
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