Long wavelength gravity anomalies and implications concerning a descending lithospheric slab in the Pacific Northwest Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gx41mn262

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  • The thermal regime of a postulated descending lithospheric slab is calculated. The gravity anomaly associated with such a structure is large in amplitude and long in wavelengh. Observed free-air gravity anomalies in the Pacific Northwest do not indicate a gravitational effect due to a descending slab. Two hypothetical compensation models proposed may mask the effects of the slab. However, a more complex form of compensation seems required. Extraction of long wavelength signals from the gravity record using matched filters is demonstrated. Caution in the interpretation of potential field records by this class of filters is recommended.
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