Seismic diffraction tomography technique using very fast simulated annealing method for delineating small subsurface features |
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| Authors: | Mahasweta Mahapatra Samiran Mahapatra |
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| Institution: | 1. Qrs. No. B – 11, Durgapur Government College Campus, Durgapur – 713214 W.B., India;2. Department of Geology, Durgapur Government College, Durgapur – 713214 W.B., India;1. School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 500-712, Republic of Korea;2. Dept. of Atmospheric & Environmental Sciences, Gangneung-Wonju National University, Gangwon-do, 210-702, Republic of Korea;3. Hydrometeorological Cooperation Center, K-water, Seoul, 427-100, Republic of Korea;4. The International Environmental Research Center, Gwangju Institute of Science and Technology (GIST), Republic of Korea;5. National Institute of Environmental Research (NIER), Incheon, 404-708, Republic of Korea;6. Department of Atmospheric Sciences, Yonsei University, Seoul, 120-749, Republic of Korea;1. Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77843, USA;2. Department of Civil Engineering, Hongik University, Seoul, South Korea;3. Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX 78712, USA;1. Federal Institute for Geosciences and Natural Resources (BGR), 30655 Hannover, Germany;2. Augsburg University (UNA), 86135 Augsburg, Germany;3. German Aerospace Center (DLR), 82 234 Oberpfaffenhofen, Germany;1. Applied Physics Laboratory, University of Washington, 1013 N.E. 40th Street, Seattle, WA 98105-6698, USA;2. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA;1. Kazan (Volga Region) Federal University, Kazan, Russia;2. Institute for Experimental Meteorology, Obninsk, Russia |
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| Abstract: | Diffraction, once considered noise rather than signal in seismic tomography, has recently been successfully used for delineating smaller objects whose size is comparable to or less than the wavelength of the incident seismic wave. But Most of the seismic diffraction tomography works are based on Born's and Rytov's approximation of weak scattering to linearize the expression for the scattered field due to an object and this is the basis of Fourier Diffraction Theorem. However, In this paper, we used the amplitude of the total scattered wave field without considering any approximation of weak scattering to obtain the synthetic scattered field data for forward modeling. These synthetic data are then inversed by Very Fast Simulated Annealing method which is a nonlinear inversion technique to obtain the unknown model parameters. This algorithm is applicable to both weak as well as strong scatterers. The simulated results give fairly good estimate for unknown model parameters of the scattering object within acceptable error limits. |
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