tomography Magazines & Journals
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International Journal of Tomography & Statistics
International Journal of Tomography & Statistics The main aim of the International Journal of Tomography and Statistics (IJTS) is to publish refereed, well-written original research articles, and studies that describe the latest research and developments in computerized Tomography and Statistics. It also ...
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Iterative algorithms for the damped minimum norm, least-squares and constrained problem in seismic tomography
The ray tomography problem can be reduced to a minimum norm, least-squares constrained problem. As is well known, the generalized inverse matrix methods, such as singular value decomposition (SVD) and damped least squares residual inversion (DLSQR, WLSQR), which work well for dense matrix problems, become ...
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Nonlinear traveltime inversion scheme for crosshole seismic tomography in tilted transversely isotropic media
Crosshole seismic tomography often is applied to image the velocity structure of an interwell medium. If the rocks are anisotropic, the tomographic technique must be adapted to the complex situation; otherwise, it leads to a false interpretation. We propose a nonlinear kinematic inversion method for crosshole ...
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Non-linear traveltime inversion for 3-D seismic tomography in strongly anisotropic media
We have developed two, new non-linear traveltime inversion schemes for 3-D seismic tomography in anisotropic media. They differ from the traditional linearized inversion approach and offer five significant improvements: (1) they are based on an alternative form of the first-order traveltime perturbation ...
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Crosshole resistivity tomography using different electrode configurations
This paper investigates the relative merits and effectiveness of cross-hole resistivity tomography using different electrode configurations for four popular electrode arrays: pole–pole, pole–bipole, bipole–pole and bipole–bipole. By examination of two synthetic models (a dipping conductive strip and a dislocated ...
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Explicit expressions and numerical calculations for the Fréchet and second derivatives in 2.5D Helmholtz equation inversion
In order to perform resistivity imaging, seismic waveform tomography or sensitivity analysis of geophysical data, the Fréchet derivatives, and even the second derivatives of the data with respect to the model parameters, may be required. We develop a practical method to compute the relevant derivatives for ...
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A crosswell seismic experiment for nickel sulphide exploration
A crosshole seismic tomography experiment was conducted in the Kambalda nickel district to image the space between two dipping exploration boreholes separated by 80 m. A downhole electromagnetic (EM) survey had disclosed a conductor (possible mineralisation) between the holes. Excellent data quality was obtained ...
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Non-linear inversion travel-time tomography: imaging high-contrast inhomogeneities
An iterative and constrained non-linear travel-time tomographic scheme is developed for imaging high-contrast inhomogeneities. The technique has been successfully tested using synthetic data. We have investigated the influence upon the image quality of the random errors in travel times for a cross-hole survey configuration. In the forward problem, the ray path is traced by finding the minimal ...
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Crosshole resistivity imaging of aquifer properties
Crosshole resistivity tomography has been trialled at the Bolivar site north of Adelaide to delineate aquifer properties and preferential flow paths associated with artificial recharge and recovery operations. To date only the pre-storage electrical measurements have been carried out, but follow-up ...
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Multi-channel, full waveform and flexible electrode combination resistivity imaging system
The usual practice of resistivity imaging using standard electrode arrays, such as Schlumberger, Wenner or dipole-dipole, is based on the pseudosection section for ease of interpretation. However, the resistivity inversion technique has been more and more applied for interpretation of electrical resistivity data. With such a technique, it is not necessary to follow the rules of the standard ...
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