Word: seismically
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Dates: during 1960-1969
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Although these bell-like reverberations were unlike any seismic event on earth, Columbia University Geophysicist Gary Latham offered a plausible explanation. The effect may have been caused, he said, by a layer of rubble or fractured rock sandwiched between bedrock in the floor of the Ocean of Storms and a solid cover of fine material deposits above. Lacking dampening fluids or gases, the layer of rubble may have acted as an echo chamber in which the seismic waves reverberated. If so, the next big seismic event on the moon should be a scientific spectacular; the third-stage rocket of Apollo...
...miles underground at intervals of twelve to 30 miles along a fault zone, the bombs would set off a series of relatively small shocks. Properly timed, these jolts would jog along the crust ever so slightly to release the forces working against it. The blasts would, in effect, be seismic safety valves, letting off small but significant amounts of pressure whenever an earthquake threatened...
...defense of their scheme, the Miami scientists point to a recent study of the seismic effects of 21 underground nuclear tests staged by the Atomic Energy Commission in Nevada, a highly quake-prone region. Though each blast was followed by countless small aftershocks, none reached quake proportions and all were substantially weaker than the original explosion. The AEC is convinced that there is little risk in conducting such tests. It plans to follow up its recent controversial detonation of a 1.2 megaton H-bomb on Amchitka Island in the Aleutians, another major quake zone, with more powerful underground blasts...
...winter that metals become brittle and men work at a fraction of their normal efficiency. Yet, during the past year, a 140-mile-wide strip of this inhospitable country bordering the Beaufort Sea was the scene of frantic activity as more than a dozen big oil companies conducted seismic tests and drilled exploratory holes in preparation for Alaska's "Great Oil Rush...
...bidding for oil-drilling rights enriched his state's coffers by $900 million (see BUSINESS). Conservationists, for reasons of their own, fear that he may be right. In their understandable haste to obtain geological data before the bidding began, some of the oil companies scarred the tundra with seismic ditches that look from above like giant graffiti and littered it with garbage and empty barrels. Once full-scale exploitation of oil begins, the effects on the North Slope could become disastrous...