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Preliminary report on seismic-reflection studies of crustal structure in the western, central, and southern United States

Crustal Studies Technical Letter 14

In cooperation with the Defense Advanced Research Projects Agency
By:
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Abstract

During 1963 the U.S. Geological Survey, with the assistance of United ElectroDynamics, Inc., recorded five separate reversed seismic profiles. In addition to these profiles, the U.S. Geological Survey participated in a seismic-calibration program for the DRIBBLE experiment at Tatum Dome, Mississippi, a 20,000-pound shot near Dexter, Missouri, and in a cooperative seismic experiment in the Lake Superior region. This work is a continuation of the program started in 1961; however, the emphasis has shifted from a detailed study of the earth's crust in the western United States to a study of crustal structure in various geologic environments including the Wyoming thrust belt, Colorado Plateau, Central Lowlands, the Gulf Coastal Plain, and the southern part of the Canadian Shield. The U.S. Geological Survey has now completed reversed seismic-refraction profiles in nine different geologic provinces. These data present a promising indication that it may be possible to predict the crustal structure in unexplored areas by considering the regional geologic and physiographic environment. The following Pn velocities have been determined: 8.2 km/sec in the Wyoming thrust belt, 7.9 km/sec in the Colorado Plateau, 8.1 km/sec in the Central Lowlands, and about 8.2 km/sec in the Gulf Coastal Plain. The data from the Lake Superior region have not yet been interpreted.

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Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Unnumbered Series
Title:
Preliminary report on seismic-reflection studies of crustal structure in the western, central, and southern United States
Series title:
Crustal Studies Technical Letter
Series number:
14
Year Published:
1963
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Denver, CO
Contributing office(s):
Earthquake Science Center
Description:
x, 55 p.
Number of Pages:
65
Country:
United States
State:
Arizona;Idaho;Mississippi;Missouri;Utah
Online Only (Y/N):
Y