Graduate Thesis Or Dissertation
 

Determination of depth to the magnetic basement using maximum entropy with application to the northern Chile trench

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ks65hg220

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  • Power spectral analysis using the maximum entropy method is applied to the estimation of depth to the source of magnetic anomalies. The method assumes that the source is two-dimensional and has a magnetization with random intensity. The predictive ability of the maximum entropy technique permits analysis of short segments of data in order to resolve short wavelength variations in source depth. The method does not require knowledge of susceptibilities or the magnetic declination and inclination. An application of the method to theoretical data and observed marine anomalies over the Peru-Chile trench yields encouraging results. Specifically, for the eastern margin of the Nazca plate, analyses generally indicate a continuous magnetic basement extending into the subduction zone. The basement is shallow seaward of the trench axis and deepens as the plate approaches the convergent margin. This apparent deepening is postulated to be due to the thickening of the oceanic crust and the deterioration of its magnetization, possibly caused by the compressional disruption of the basaltic layer. Landward of the trench axis, the depth estimates indicate possible uplift of the oceanic material into the lower slope of the continental margin.
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