Word: thrusting
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...similar process goes on along smaller cracks in the crust outside the main fault line. But while the earth slides horizontally along the San Andreas, many of the other fissures, including the one under Northridge, are called thrust faults because they cause the ground to move vertically. Given enough time, they help form mountains and valleys...
Surprisingly, the hazards of thrust faults were largely overlooked until 1983, when a fierce temblor hit the small central California town of Coalinga. The culprit turned out to be a deeply buried fault (four to 10 miles down) that no one had known about. Its only sign on the surface had been a fold, or buckling, in the earth's crust. Many scientists had thought such folds were harmless, formed by an imperceptibly gradual lifting of the ground. But when Ross Stein, a geophysicist with the U.S. Geological Survey, and geologist Robert Yeats of Oregon State University examined the seismic...
Around the same time, other researchers began examining maps drawn up by petroleum geologists. Thrust faults, and the folds they form, are excellent traps for gas and oil, and many such subterranean spots have been found in the Los Angeles region. But were these structures still active? In recent years, nature has provided an unequivocal answer. Since 1987, when the Whittier Narrows earthquake caused eight deaths and $350 million in property damage, about half a dozen quakes of significant size have rattled along thrust faults beneath greater Los Angeles. All this activity, many scientists speculate, may . be a symptom that...
Rather, the quake was caused by what is termed a blind thrust, or more commonly, ahidden fault. This is a fault which has not risento the surface...
...ritual mask from New Guinea. Says Perry: "The mask, though once a living part of a tree, is dead. Nevertheless, it has, through the artistry of its maker, been imbued with a life force of its own." Into the Labyrinth does not always carry so powerful a thrust, but its exotic elements fuse and cast a spell of breathless gravity...