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Bulletin of the Seismological Society of America; October 1986; v. 76; no. 5; p. 1241-1251
© 1986 Seismological Society of America
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Lg magnitudes of selected East Kazakhstan underground explosions

OTTO W. NUTTLI

DEPARTMENT OF EARTH AND ATMOSPHERIC SCIENCES ST. LOUIS UNIVERSITY, P.O. BOX 8099—LACLEDE STATION, ST. LOUIS, MISSOURI 63103

Abstract

The amplitude of 1-sec period Lg waves, as recorded on seismograms of WWSSN stations in southern Asia and Scandinavia, are used to determine mb(Lg) values for 62 underground nuclear explosions in the eastern portion of the East Kazakhstan Test Site. The explosions were selected to be of mb(P) = 5.5 or greater in the period 1965 to 1985.

The yields of the explosions are estimated, assuming that a Nevada Test Site-derived relation between mb(Lg) and yield for water-saturated rock is also applicable to the East Kazakhstan Test Site. Assuming that lateral variations in crustal structure and in depth of emplacement of the explosion do not affect mb(Lg) values, the Lg data indicate that the mb(P) bias between the Nevada Test Site and East Kazakhstan is 0.35 magnitude units.




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