Word: seismograms
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Dates: during 1960-1960
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...underground testing raises troublesome detection problems here and now. Neither fallout nor radiation escapes, and the only way to detect the test is to use seismographic instruments to pick up the earth tremors. Since there is no sure way to tell from the tremor's "signature" on the seismogram whether it was caused by an earthquake or an underground explosion, inspection teams are needed to make on-the-spot checks of suspicious tremors...
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