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U.S. Geological Survey Crustal Studies Technical Letter Number 19

In cooperation with the Defense Advanced Research Projects Agency

Crustal Structure in the Eastern Colorado Plateaus Provence from Seismic-Refraction Measurements

By John C. Roller


Thumbnail of and link to report PDF (12 MB)Abstract

A reversed seismic-refraction profile was recorded in the Colorado Plateaus Province from Hanksville, Utah, to Chinle, Arizona, The velocity of Pg is 6.2 km/sec, and the true velocity of Pn is 7.8 km/sec, Waves identified as reflections indicate that an intermediate layer in the crust has a velocity of approximately 6.8 km/sec. Thickness of the crust is 43 km at Chinle and 40 km at Hanksville. The Pn velocity in the Colorado Plateaus Province is the same as that in the Basin and Range Province, but is significantly lower than Pn in the High Plains of Colorado.

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Suggested citation:

Roller, J.C., 1964, Crustal structure in the eastern Colorado Plateaus Provence from seismic-refraction measurements: U.S. Geological Survey Crustal Studies Technical Letter Number 19, 28 p. (Available at




Geology and Physiography

Information on the Seismograms

Depth Calculations




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