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Difficulty in detecting reefs in northern Michigan is caused mainly by noise, "multiples" (reverberations), variations in topography, and variations in thickness of weathered material and glacial drift. During the last three years new data-processing techniques--such as automatic statics and deconvolution, and relative-amplitude processing methods--have led to improved detection of reefs. Quality of information from seismic sections is enhanced further as data-processing geophysicists gain experience in the areas of activity. Communication among data-processing geophysicists, interpreters, and geologists also is necessary to produce the most reliable picture of subsurface geology in the reef tracts.
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