Browsing by Author "Dukeshire, Andrea"

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    Improved efficiency of marine em subsurface modeling using the total-field scattered-field fdtd formulation
    (2012) Dukeshire, Andrea; Potter, Michael E.; Okoniewski, Michal
    To efficiently model the effect of the airwave in the controlled-source electromagnet-1cs (CSEM) method has historically been a problem of major interest. The methods proposed in this thesis provide a new method of simulating CSEM interactions in the finite-difference time-domain (FDTD) by using the total-field scattered-field (TFSF) for­mulation. TFSF provides an inherent separation of the total and scattered fields, which allows the proposed method to decompose the CSEM domain into separate simulation runs. By simulating the problem in stages, the process of extracting the response of the scatterer is streamlined. If the increased efficiency options within the proposed method are utilized, the effi­ciency of single forward simulations can be improved. This method shows potential for computational cost savings, especially in typical CSEM data analysis and reconstruction situations where numerous iterations of various scatterers are required.