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U.S. Geological Survey Open-File Report 2015-1153

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Sea-Floor Texture and Physiographic Zones of the Inner Continental Shelf From Salisbury to Nahant, Massachusetts, Including the Merrimack Embayment and Western Massachusetts Bay

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An image of backscatter for the study area at 10-meter resolution, created from a series of published backscatter images. Areas of high backscatter intensity (light tones) have strong acoustic reflections and suggest boulders, gravels, and generally coarse sea-floor sediments. Areas of low backscatter intensity (dark tones) have weak acoustic reflections and are generally of finer grained material such as muds and fine sands. Regularly spaced striping is an artifact of the surveys.

Figure 3. A composite backscatter image of the study area at 10-meter resolution, created from a series of published backscatter images (table 2). Areas of high backscatter intensity (light tones) have strong acoustic reflections and suggest boulders, gravels, and generally coarse sea-floor sediments. Areas of low backscatter intensity (dark tones) have weak acoustic reflections and are generally of finer grained material such as muds and fine sands. Regularly spaced striping is an artifact of the surveys.

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