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Bulletin of the Seismological Society of America; October 1976; v. 66; no. 5; p. 1733-1747
© 1976 Seismological Society of America
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Temporal and spatial variations of travel-time residuals in central California for Novaya Zemlya events

RUSSELL ROBINSON* and H. M. IYER

U.S. GEOLOGICAL SURVEY, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025

Abstract

Eight large nuclear explosions in Novaya Zemlya, from October 1969, through November 1974, were used to monitor long-term variations in crustal seismic velocity near the San Andreas fault in central California. Relative P-wave travel-time residuals appear to be accurate to approximately ±0.1 sec. Of the over 100 stations used, none show clearly significant temporal variations in residual greater than this amount, corresponding to about a 4 per cent change in velocity in the upper crust. Average relative residuals at individual stations show a large spatial variation of about 1.5 sec. These variations reflect both a complex crustal geology and changes in crustal thickness and provide a potentially powerful tool for studying crustal structure.

Footnotes

* Present address: Geophysics Division Department of Scientific and Industrial Research, Box 1320, Wellington, New Zealand.




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