Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 4 of 4 for “"Adjoint state method"”.
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Geometrically-informed methods of wave-based imaging
… wave-based imaging techniques defined by the adjoint-state method. Wave-based imaging uses wavefield data from receivers on the boundary of a domain to produce an image of the underlying structure in the domain of interest. These images are defined by the imaging condition, derived from the …
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Efficient seismic imaging with the double plane wave data
… RTM has been proven to outperform other imaging methods in correctly revealing the subsurface structures. However, implementing the traditional pre-stack shot profile RTM is computationally expensive. Time consuming wavefield propagation processes need to be performed for each shot gather to …
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Modeling, imaging and waveform-inversion in attenuative anisotropic media
… this thesis, I develop a waveform-inversion (WI) methodology for attenuation estimation, as well as an attenuation- compensated time-reversal (TR) imaging algorithm, for transversely isotropic media with a vertical symmetry axis (VTI). The attenuation model is assumed to have the same symmetry as …
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Efficient modeling and waveform inversion of multicomponent seismic data for anisotropic media
… with results from the spectral-element method (SEM) demonstrates the high accuracy of the algorithm. Next, this methodology is extended to a coupled fluid/solid medium to accurately handle the boundary conditions at the seafloor for marine seismic applications. Numerical experiments …