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Bulletin of the Seismological Society of America; June 1980; v. 70; no. 3; p. 809-822
© 1980 Seismological Society of America
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S-wave residuals in Canada

A. J. WICKENS and G. G. R. BUCHBINDER

DIVISION OF SEISMOLOGY AND GEOTHERMAL STUDIES EARTH PHYSICS BRANCH DEPARTMENT OF ENERGY, MINES AND RESOURCES, OTTAWA, ONTARIO Canada

Abstract

Relative S-wave station residuals have been determined over the Canadian long-period seismograph network and have been augmented by S residuals to the south into the United States taken from Poupinet (1977). The thick craton of the Canadian Shield is outlined by the S-residual contours with an inferred rapid thinning of the craton to the south except for a narrow central extension into Kentucky and Missouri. A comparison of these S residuals with P-wave residuals of Buchbinder and Poupinet (1977) reveals a low-velocity region in the west, a high-velocity zone centrally, and an area in the east where the S arrivals are late while the P arrivals are early.




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