Marine seismic studies near Newport, Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5425kc953

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  • In July 1964 three seismic refraction profiles were recorded over Stonewall Bank (44°32'N, 124°24'W) to determine gross sub-bottom geological structure to depths of thousands of feet. In August 1964 a continuous seismic reflection profiler was used to document shallow geological structure within the rocks forming the Bank. Stonewall Bank is composed of eastward dipping Pliocene siltstones which emerge westward from beneath unconsolidated Quaternary sediments. These siltstones form gentle dip slopes on the Bank's ea-stern flank but rougher topography is found on the top and western flank where the bedding planes intersect the sea floor at greater angles. Refraction data from this study indicate the siltstones thicken southward by 5000 feet over a six mile distance which accounts for almost all of the thickness change in the measured section. A deeper layer, 5000 feet thick, which appears to be Miocene may be exposed west of the Bank beneath the sediments. The base of this deeper layer has a southerly dip component of about six degrees and lies 12, 000 feet below the southern end of the Bank. Although this was the deepest interface encountered, the underlying material is not believed to be basement.
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