Word: seismicity
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...produce signals equivalent to an underground nuclear explosion of given yield than had been expected." All by itself, that brief statement represented quite a switch; the Defense Department has usually favored the attitude that secret Russian underground tests could not be distinguished from natural earthquakes except by dozens of seismic stations spaced a few hundred miles apart on Communist territory...
Purcell claimed Leet had been offered a chance to present a detailed scientific to high Administration officials but had refused to do so. "All Washington is not out to sabotage Professor Leet's inspection system, or to get contracts for themselves to investigate seismic shock waves." Purcell said he had made the statement to clear up possible "misconceptions" about Leet's case...
Leet uses diagrams to indicate that earthquake and blast patterns are visibly different if recorded sufficiently far from the seismic event. The research on which the U.S. based its inspection demands at Geneva showed that the likelihood of detection increased with proximity to the blast...
...Leet, professor of Geology chose the May 9th meeting of the American Academy of Sciences to outline his plan for seismic detection of underground nuclear tests. At the meeting in Brookline, Leet showed slides to the assembled scientists illustrating his contention that earthquake and blast waves are visibly different when recorded from a sufficient distance...
...which graphic differences become apparent, Leet feels, has been overlooked by scientists who are engaged in detection research for the U.S. government. Because these scientists, who worked on the Berkner Panel and the Air Force's Project Vela Uniform, reasoned that moving their stations closer to the suspicious seismic events would enhance chances of detection, Leet feels "they have missed the forest for the trees...