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《Progress in Geophysics》 2014-05
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Simultaneous inversion for velocity and reflector geometry based on the multi-phase fresnel volume rays

LI Xing-wang;BAI Chao-ying;YU Zi-chao;Department of Geophysics,College of Geology Engineering and Geomatics,Chang’an University;Institute of Computing Geophysics,Chang’an University;  
Traditional ray tomography method based on high frequency assumption is unable to obtain a high resolution tomographic picture.In contrast,the finite-frequency ray theory is more suitable for real seismic propagation law,that is to say that the travel time is dependent not only on the velocity distribution along a central ray(or traditional geometric ray),but also on the velocity anomaly within a region(referred as first Fresnel Volume),which embrace the central ray.In this paper we first put forward an algorithm to calculate the multiphase Fresnel Volume finite-frequency ray,and then give a inversion method to simultaneous invert both velocity and reflector geometry by using these multi-phase arrival time information.In synthetic example,both the traditional ray tomographic and finite-frequency ray tomographic methods are used to simultaneously update both velocity field and reflector geometry with multi-phase arrival times,the results show that the finite-frequency ray tomographic method is advantageous over the traditional ray tomographic method in terms of velocity reconstruction and reflector geometry updating when the ray density is relatively low.The finite-frequency ray tomographic method with varying frequency is again better than the finitefrequency ray tomographic method with single frequency.
【Fund】: 教育部高校博士学科点基金项目(20110205110010)资助
【CateGory Index】: P315
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