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Lg magnitudes and yield estimates for underground Novaya Zemlya nuclear explosions

DEPARTMENT OF EARTH AND ATMOSPHERIC SCIENCES SAINT LOUIS UNIVERSITY, 3507 LACLEDE AVENUE, SAINT LOUIS, MISSOURI 63103

Abstract

Lg-wave amplitudes of 30 Novaya Zemlya underground nuclear explosions, as recorded by short-period seismographs in Denmark, Finland, Germany, Norway, Spitsbergen, and Sweden, are used to determine m_b(Lg) values. Assuming that the m_b(Lg) versus explosion yield relation derived from Nevada Test Site data applies to all continental areas, the yields of the explosions are estimated. They cover a large range of values, from 2.5 to 4900 kt. The largest explosion since April 1976 had an estimated yield of 145 kt.

The m_b(Lg) values, when subtracted from the m_b(P) values, can be used to estimate the m_b(P) bias between two test sites. In this way, the m_b(P) bias between Novaya Zemlya and the Nevada Test Site is estimated to be 0.20 magnitude units.

Footnotes

^* Dr. Nuttli died 10 February 1988.

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