Word: seismicity
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LIKE the Andean republics to the north, Chile lies along the "circle of fire," a ring of volcanoes and seismic fault lines that encircle the Pacific Basin. The west coast of South America, in particular, is a storm center of seismic shocks set off by the depth and turbulence of the Peru-Chile trench offshore. One such shock struck Peru in May 1970, killing an estimated 50,000 people. The Chileans too have paid a heavy price for their geography. Some 3,000 Chileans were killed in the 1906 earthquake...
Kenneth Wells, Singapore representative of Ray Geophysical Company, which did recent seismic exploration off the coast of Vietnam, said, "The North Vietnamese don't have much naval power. It is a calculated risk but not much worse than some in the Middle East these days...
...ideal site for a nuclear plant is one for which there is no evidence of any seismic activity over the past millennia; is not subject to hurricanes, tornadoes or floods. It should be in an endless expanse of unpopulated desert with an abundant supply of very cold water flowing nowhere and containing no aquatic life. Most important, it should be adjacent to a major load center...
...prone region that circles the Pacific Basin. It reaches as far south as New Zealand on the west, north through Japan, across the Aleutians and down the coast of the Americas on the east. Only recently have geophysicists begun to understand what stokes the ring's "fires." The seismic activity, they think, is the result of slow, creeping movements of the Pacific Ocean floor against the continental margins that surround it. In California, these movements have produced a distinctive, local effect: a 600-mile fissure in the earth called the San Andreas fault, which begins in the Gulf...
...Igloo White is an Air Force ground sensor system modeled on the Navy's acoustic submarine detectors. The sensors are dropped during overflights and either catch in tree branches or bury themselves in the ground. Two main types have been used: seismic, which detect ground movements caused by moving trucks and even marching soldiers, and acoustic, which use tiny microphones so sensitive that they can clearly transmit human voices (several conversations have been picked up among Communist troops discussing how to dismantle the sensor). Information from the sensors is relayed by planes to ground-based monitors stationed in South...