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Crustal Structure of the Northeastern United States: Contrasts between Grenville and Appalachian Provinces
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Crustal Structure of the Northeastern United States: Contrasts between Grenville and Appalachian Provinces
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Journal Article
Crustal Structure of the Northeastern United States: Contrasts between Grenville and Appalachian Provinces
1980
Overview
Average crustal models for the northeastern United States are computed on the basis of the travel times of P and S waves from regional earthquakes. The Precambrian Grenville Province in New York State has a relatively homogeneous crust. The Paleozoic New England Appalachians have a well-defined, two-layer crust that is slightly thicker and shows a high-velocity lower layer relative to the Grenville. A time-term analysis based on P$_{\\text{n}}$ data (waves refracted from the Moho) shows that a relatively thick or low-velocity crust parallels northeast-trending geologic structures in central New England. The observed differences between the two orogenic belts may reflect contrasts in their tectonic evolution.
Publisher
The American Association for the Advancement of Science
