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... and mysterious objects.

. . . and mysterious objects

At 4:20 a.m. last Sept. 19, a resident of Yellowknife in theNorthwest Territories watched a point of light flash across the sky. He called the local office of the Geological Survey of Canada to see if they had noticed anything on their seismic measuring devices.

Analysis of that morning's readings showed that somethinghad traveled over the devices at a height of 45 kilometers and a speed of 12 kilometers a second, with no evidence of having hit the earth. Frank M. Anglin and his colleagues at the Survey concluded the object was meteor that produced a strong sonic wave. While seismometers have picked up the crashing of meteors into the earth, the Sept. 19 observation is apparently the first time they have detected an aerial event, says Anglin.

The Yellowknife instruments are intended to pick up seismicsignals from underground nuclear testing; knowing that a meteor can show up on the reading will help in seismic verification of nuclear test blasts, Anglin says. "You don't like mysterious signals lying around,' he says.
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Title Annotation:seismic measuring devices in Northwest Territories detect meteor
Author:Silberner, Joanne
Publication:Science News
Date:Apr 11, 1987
Words:176
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