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Word: seismicity (lookup in dictionary) (lookup stats)
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Dziewonski and Su created the model using a technique known as seismic tomography, based on many of the same principles as CAT scans...

Author: By Ivan Oransky, CRIMSON STAFF WRITER | Title: Geologists Spar Over Model | 11/12/1992 | See Source »

Waves created by seismic disturbances travel to and from points on the earth at different speeds depending on the material between the points. For instance, hot areas like mid-ocean ridges slow down waves, while cooler areas, such as continents, allow them to travel at faster-than-average speed...

Author: By Ivan Oransky, CRIMSON STAFF WRITER | Title: Geologists Spar Over Model | 11/12/1992 | See Source »

Other parts of the state harbor underground injection wells for toxic-waste disposal. While many experts contest the safety of such wells, the Clinton-appointed Arkansas Pollution Control and Ecology Department has defended their use. Extensive well-monitoring and seismic testing are not required prior to drilling of such wells in Arkansas, although they are mandated in states such as Ohio...

Author: NO WRITER ATTRIBUTED | Title: Balance in Power | 10/30/1992 | See Source »

...little stress on the San Andreas," exclaims Allan Lindh, chief seismologist of the U.S. Geological Survey, "then what about the accumulated stress of 300 years of plate motion?" For Lindh and other experts, the Landers quake and its resulting tremors are all too reminiscent of the increased seismic activity that preceded the great San Francisco blowout of 1906. "I mean," says Lindh, with a dramatic pause, "how much more on the edge of our chairs...

Author: /time Magazine | Title: News From the Underground | 8/24/1992 | See Source »

...today more sophisticated systems can alert people as much as a minute before a city starts to shake. "This is possible," explains Massachusetts Institute of Technology geophysicist M. Nafi Toksoz, "because seismic waves propagate through the earth's crust relatively slowly, 5 to 8 km/sec. With an extensive network of sensors, we can locate the epicenter and determine the magnitude of an earthquake. This gives us the opportunity to warn people in outlying areas." How long a warning depends on the distance from the epicenter. Had such a system been in place in Mexico, for example, residents of Mexico City...

Author: /time Magazine | Title: Warning: You Have 30 Seconds . . . | 8/24/1992 | See Source »

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