Skip to Main Content
Book Chapter

Geophysical data

By
Robert E. Sheridan
Robert E. Sheridan
Department of Geological Sciences, Rutgers University, New Brunswick, New Jersey 08903
Search for other works by this author on:
;
John A. Grow
John A. Grow
U.S. Geological Survey, MS 913, Box 25046, Denver Federal Center, Denver, Colorado 80225
Search for other works by this author on:
;
Kim D. Klitgord
Kim D. Klitgord
U.S. Geological Survey, Woods Hole, Massachusetts 02543
Search for other works by this author on:
Published:
January 01, 1988

Abstract

Understanding the geology of the U.S. Atlantic margin is based on a sparse set of drilling and dredge data integrated with a much larger base of geophysical data. Geophysical data provide the primary basis for interpreting structural features and extrapolating from the sparse geological control. The purpose of this chapter is to present the scope of geophysical data coverage of the Atlantic continental margin in a general review format. The discussion will touch on the kinds of data produced by different technologies, the historical reasons for the use of various methods, and the improvement of methods.

There are two basic classes of geophysical data used in margin studies: seismic data and potential field data. Seismic techniques utilize acoustic energy sources and receivers to examine seismic-wave propagation characteristics of the subsurface rocks. This information includes variation in acoustic reflectivity and velocity within the rock. Near-vertical incidence reflection profiling is used to map structures on a regional basis. Wide-angle seismic-reflection and seismic-refraction profiling are used to examine seismic-velocity structures. Magnetic and gravity potential field anomaly data sets complement the seismic information, providing a means for extrapolating it over broad regions. The comparatively low cost of magnetic and gravity surveying has resulted in the acquisition of fairly dense regional data sets (2 to 10 km line spacing) compared with more coarse regional seismic grids (20 to 30 km line spacing).

You do not currently have access to this article.

Figures & Tables

Contents

DNAG, Geology of North America

The Atlantic Continental Margin

Robert E. Sheridan
Robert E. Sheridan
Robert E. Sheridan Department of Geological Sciences Busch Campus Rutgers University New Brunswick, New Jersey 08903
Search for other works by this author on:
;
John A. Grow
John A. Grow
U.S. Geological Survey MS 960, Box 25046 Denver Federal Center Denver, Colorado 80225
Search for other works by this author on:
Geological Society of America
Volume
I-2
ISBN electronic:
9780813754581
Publication date:
January 01, 1988

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal