APPROXIMATION of THREE - DIMENSIONAL INHOMOGENJEITIES BY TWO - DIMENSIONAL INHOMOGERELTIES IN MAGNETOTELLUHIC INTERPRETATION

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dc.contributor.authorOnwuegbuche, Anthony Azunna
dc.date.accessioned2014-02-11T11:06:55Z
dc.date.available2014-02-11T11:06:55Z
dc.date.issued1984-07
dc.descriptionSubmitted in p a r t i a l fulfilment of the requirements for the degree of master of Science, Applied Geophysics Department of Physics Ahmadu B e l l o U n i v e r s i ty z a r iaen_US
dc.description.abstractThe approximation of buried simple conductive three - dimensional (3 - D) inhomogeneities by two # dimensional (2 - D) inhomogeneities is investigated numerically using the Rayleigh-FfT modeling technique. The technique is applicable to curved interfaces between regions of different conductivity. The effects of the increased aspect ratio of the 3 - D models on the apparent resistivities, skew and tipper for the E - parallel and E - perpendicular modes are studied. Also investigated is the behaviour of these quantities when the condition for electrodynamio similitude to exist between two models is satisfied. The results show that 3 - D E - perpendicular mode apparent resistivities and the 2 - D Transverse magnetic (TM) mode, values agree very closely. The 3 - D E - parallel mode apparent resistivities are sensitive to strike extent and frequency and approach the ? - D Transverse eleotric (TE) mode results as the aspect ratio is increased. It is found that the ratio of the width of the inhomogeneity to the skin depth in the half-space is a very important quantity in predicting the percentage difference between the 2 - D and 3 - D values at a given aspect ratio. Very simple guidelines for the above prediction are given for models having conductivity contrast of 1 : 10 or its powers. The maximum skew values for the 3 - D models decreased by about 60 percent for a change in aspect ratio from 2 to 4 and ..m remained constant when the aspect ratio is changed from 4 to 6. In general, as the aspect ratio is increased the tipper azimuths around the. middle of the inhomogeneities indicated the long axes of the bodies. When the condition for similitude to exist between two models is satisfied, it is found that the apparent resistivities are appropriately scaled while the skew values, tipper magnitudes and tipper azimuths are the same for both models. |en_US
dc.identifier.urihttp://hdl.handle.net/123456789/1173
dc.language.isoenen_US
dc.subjectAPPROXIMATION,en_US
dc.subjectTHREE - DIMENSIONAL INHOMOGENJEITIES,en_US
dc.subjectTWO - DIMENSIONAL INHOMOGERELTIES,en_US
dc.subjectMAGNETOTELLUHIC INTERPRETATIONen_US
dc.titleAPPROXIMATION of THREE - DIMENSIONAL INHOMOGENJEITIES BY TWO - DIMENSIONAL INHOMOGERELTIES IN MAGNETOTELLUHIC INTERPRETATIONen_US
dc.typeThesisen_US
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