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. / Graduation date: 1976
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/29208 |
| Date | 09 February 1976 |
| Creators | Hassanzadeh, Siamak |
| Contributors | Blakely, Richard J. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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