Word: seismicly
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...roam the land with their unreliable witch-hazel divining rods, are no longer adequate-although there are still enough of them around to call a meeting of the American Society of Dowsers Inc. this week in Vermont. Man has taught himself to prospect for new sources of water by seismic refraction and aerial photography. Since World War II, engineers have gone into the remotest valleys to dig wells, build dams, cut canals and lay pipelines. In the U.S., some $10 billion is spent annually on dams, waterworks, sewage-treatment plants, pipelines, canals and levees...
...will go into full operation this fall. Spread out in a giant circle 125 miles in diameter near Miles City, the apparatus consists of 525 seismometers buried 200 ft. deep. They are arranged in 21 smaller circles, each 41 miles in diameter and each as sensitive as the best seismic array the U.S. has built to date...
Poolroom Processing. Modern seismometers have such good ears that they must be buried deep in relatively uninhabited areas to be as free as possible from the surface noises of wind, rain, traffic and grazing cattle. Known as LASA, for Large Aperture Seismic Array, the Montana system was laid out to get the best possible signal-to-noise ratio; it promises to provide a twentyfold improvement in the U.S.'s ability to detect seismic signals. With so many instruments spaced so far apart, it will also be possible to trace the direction and distance of an incoming signal because...
...each cluster, the Montana seismometers are set like spokes in a wheel, and at the center of each wheel is a small vault housing instruments for collecting the seismic signals. After the signals are picked up and amplified, they are translated into digital data and transmitted over telephone lines and radio to a data-processing center in a converted poolroom 140 miles away in Billings. The signals are eventually sent to M.I.T.'s Lincoln Laboratory in Lexington, Mass., where computers are programmed to determine more precisely the source and direction of the vibrations and whether they were caused...
...does LASA guarantee that scientists can tell the difference between some earthquakes and some nuclear blasts. But the computers have a variety of valuable information built in to help them. They are set to label automatically as earthquakes any tremors coming from places with no nuclear capability. And a seismic wave definitely shown to originate from deeper in the earth than it would be practical for man to dig will also be classified as non-atomic...