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High-Resolution Geologic Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts

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Title Page

Table of Contents
List of Figures
Introduction
Maps
Data Collection
and Processing
Geologic Interpretation
References
Acknowledgments

Appendices

Geographic Information
System
Sediment Texture
Bottom Photographs
Seismic Profiles

Appendix 4 - High-resolution Seismic Reflection Profiles


Image of Figure A4.1. Line number of seismic profiles collected as part of the Nahant to Gloucester mapping project.
Figure A4.1. Line number of seismic profiles collected as part of the Nahant to Gloucester mapping project. Click on figure for larger image (PDF format 2 mb).

A closely spaced grid of high-resolution seismic reflection profiles were collected using a Knudsen 320b chirp system (3.5-12 kHz) (fig. A4.1, PDF format). To best view these profiles and determine their locations, we recommend downloading the personal geodatabase and following the directions in Appendix 1. Alternatively, the profiles may be viewed by noting the line number from figure A4.1 (PDF format) and finding the corresponding image in the directory of seismic profile images.

See figure 3.5 and Map Sheet 5 (PDF format) for an isopach map of total sediment thickness that was generated by interpolating the seismic reflection profiles into a continuous 50m grid.

Table A4.1. Line numbers and corresponding images name of seismic reflection profiles. Download (Excel format )

Adobe Reader To view files in PDF format, download free copy of Adobe Reader.



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