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Bulletin of the Seismological Society of America; October 1955; v. 45; no. 4; p. 303-325
© 1955 Seismological Society of America
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Seismic study of crustal structure in Pennsylvania and New York*

SAMUEL KATZ

LAMONT GEOLOGICAL OBSERVATORY (COLUMBIA UNIVERSITY)

Abstract

Blasts at two quarries in northern New York and central Pennsylvania have been recorded to a distance of 309 km. The data indicate an essentially homogeneous, unlayered crust, with elastic wave velocities possibly increasing with depth. An average crustal thickness for the region is 34.4 km., with no indication of significant difference in thickness between the two areas. Observed compressional wave velocities for the crust are 6.39 and 6.31 km/sec. for New York, and 6.04 km/sec. for Pennsylvania. The corresponding shear wave velocities are 3.62 and 3.60 km/sec., and 3.61 km/sec. Average upper mantle velocities are 8.14 km/sec. for Pn and 4.69 km/sec. for Sn. The compressional wave velocity of anorthosite near Tahawus, N.Y., is 6.63 km/sec. No near-vertical reflections from the Mohorovicic discontinuity were observed.

Footnotes

* This research has been supported by the Geophysics Research Division of the Air Force Cambridge Research Center under Contract AF 19(122)441, and was awarded the George Frederick Kunz Prize in Geology and Mineralogy by the New York Academy of Sciences, December, 1953.

Present address of author: Stanford Research Institute, Menlo Park, California




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