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U.S. Geological Survey Open-File Report 2007-1373

High-Resolution Geologic Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts

Skip past contents informationTitle Page / Table of Contents / List of Figures / Introduction / Maps / Data Collection/Processing / Interpretation / Summary / Acknowledgments / References Cited / Appendix 1 / Appendix 2 / Appendix 3 / Appendix 4 / Appendix 5

Figure 4.4. Maps showing bathymetry (upper left) and acoustic-backscatter intensity (upper right) in the northwestern part of the survey area. A small Shelf Valley (SV) cuts through a large expanse of Rocky Zone (RZ), adjacent to the relatively smooth, sand- and gravel-covered surface of the Nearshore Ramp (NR). Bottom photographs A-C and seismic-reflection profile (bottom) are indicated by yellow circles and a red line, respectively. The distance across the bottom of the photographs is approximately 50 cm. See Figure 4.1 for location. A constant seismic velocity of 1500 m/s through water, sediment, and rock was used to convert from two-way travel time to depth.


Figure 4.4.  Maps showing bathymetry (upper left) and acoustic-backscatter intensity (upper right) in the northwestern part of the survey area.  A small Shelf Valley (SV) cuts through a large expanse of Rocky Zone (RZ), adjacent to the relatively smooth, sand- and gravel-covered surface of the Nearshore Ramp (NR).  Bottom photographs A–C and seismic-reflection profile (bottom) are indicated by yellow circles and a red line, respectively.  The distance across the bottom of the photographs is approximately 50 cm.  See Figure 4.1 for location.  A constant seismic velocity of 1500 m/s through water, sediment, and rock was used to convert from two-way travel time to depth.

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