Seismic velocities in the shallow crust of western New England and northern New York

Abstract

The Ontario-New York-New England refraction study (O-NYNEX) provides a set of high-quality data for a tomographic study of an intraplate continental region with low seismic activity. This study focuses on the region crossed by the US part of the O-NYNEX profile. Tomographic inversion of the travel-time data is used to construct a three-dimensional model of the P- and S-wave seismic velocity distribution within the shallow crust of this region. The upper crust of the Proterozoic Grenville Province is found to have a P-wave velocity 0.2 to 0.3 km/sec higher than the Paleozoic Appalachians. The area of anorthositic intrusions within the Adirondack Mountains is characterized by P-wave velocities 0.3 km/sec higher and S-wave velocities 0.1 km/sec higher than the average values for the Grenville Province. The velocity structure of central Vermont is found to be closer to that of the Grenville Province than to the rest of the Appalachians. -from Authors

Publication Title

Bulletin Seismological Society of America

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