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Bulletin of the Seismological Society of America; October 1985; v. 75; no. 5; p. 1363-1369
© 1985 Seismological Society of America
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In situ velocity estimates for shallow crystalline rocks in the Adirondack Mountains, New York and the Laramie Range, Wyoming

BENJAMIN ALTER*

CORNELL UNIVERSITY, ITHACA, NEW YORK 14853

Abstract

An analysis of near-surface COCORP seismic data provides in situ P-wave velocities for various outcropping Precambrian metasedimentary and metaigneous rocks along reflection lines in the Adirondack Mountains, New York and the Laramie Range, Wyoming. Calculated velocities range from 5.4 to 6.4 km/sec for 12 outcropping lithologies. Significant contrasts exist even between crystalline rocks with similar geologic histories, implying that even simple geologic contacts within crystalline provinces may be imaged in the lower crust.

Footnotes

* Present address: Chevron, U.S.A., New Orleans, Louisiana 70112.




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Rayleigh Waves Generated by Mining Explosions and Upper Crustal Structure around the Powder River Basin, Wyoming
Bulletin of the Seismological Society of America, August 1, 2004; 94(4): 1410 - 1429.



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