Russians set off 3 N-blasts
NZPA Stockholm The Soviet Union detonated three underground nuclear devices yesterday, says a spokesman for the Seismology Department at Uppsala University. The explosions were in an area north of the Caspian Sea and began at 4 a.m. Greenwich time (4 p.m. N.Z.) at five-minute intervals, a spokesman said. The first explosion was the strongest and had a magnitude of 6 on the Richter scale, the second measured 5.9 and the third 5.8, said the spokesman. The Richter scale is a measure of ground motion recorded on seismographs to measure the strength of earthquakes. An earthquake of 3.5 on the Richter scale can cause slight damage in the local area, 4 moderate damage. A reading of 7 is a very heavy earthquake capable of widespread, heavy damage. The Soviet Union detonated a powerful underground nuclear devic? with a blast that registered 7.1 on the Richter scale in the area of Semipalatinsk, East Kazakhstan, a month ago, Uppsala University reported.
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Press, 11 July 1983, Page 8
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163Russians set off 3 N-blasts Press, 11 July 1983, Page 8
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