Study finds reduced quake risk on California fault     A geophysicist at the University of California, Berkeley, has assessed movement along the northern Hayward fault and found less chance of a major quake originating on that segment than previously thought. The study uses new techniques for monitoring earthquake fault activity, including technology developed by NASA.     With the help of radar interferometry and data from global positioning satellites (GPS), plus analysis of repeating microquakes 10 kilometers (6 miles) below the surface, Dr. Roland Burgmann, assistant professor of geology and geophysics at UC Berkeley, and his colleagues concluded that the deep portions of the fault steadily slip at about the same rate as the surface. This means the rocks deep below the surface aren't locked and building up strain that could be released in a catastrophic quake. (Full Story) 8/17/2000		FEATURES:   More News   Pictures   Missions   Site Directory   BACKGROUND:   About JPL   Information   Education   Employment   RELATED SITES:   NASA   Caltech
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