Marine geophysical studies offshore: Newport, Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pc289m24m

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  • A marine geophysical study using shallow seismic reflection, gravity and magnetic methods of investigation was done for an offshore area near Newport, Oregon. The area is bounded by the latitudes 44°1O' to 44°50' N. and longitudes 124°07' to 124°30' W. The interpretation of observational data showed that the geology of the area north of latitude 44°25' N. consists of a north-south syncline. A geological, two-dimensional model was constructed to agree with the observed gravity and geological data along an east-west cross section in the area. The model's synclinal axis was found to shift to the west with depth. Basement depths of 19,000 to 21,500 feet were given in the deepest portion of the model syncline. If regional gravity decreases to the west, the model would have to be made shallower, and the axis shift to the west would be less pronounced. Seismic data indicate complex minor folding and possible faulting in the central portion of the area of investigation (central and southern Stonewall Bank). Gravity and magnetic readings indicate a rise of the basement in the western part of the area (west of Stonewall Bank) The geology of the area south of latitude 44°25' N. was interpreted to be a large, crystalline rock mass with its upper surface at shallow depths off Cape Perpetua. Gravity and magnetic data indicate that the crystalline mass noses down to the northwest. Geological models, that were constructed in this area to agree with gravity and geological data, indicate that the mass is probably cone-shaped, and the basement of the surrounding country rock is 13,000 to 16,000 feet deep. Shallow volcanic flows may be present in this area.
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