killing 69

By Jessica Berman
Washington
09 July 2008
Scientists have registered signs of an impending earthquake 10 hoursbefore it occurred along California's San Andreas Fault. Seismologistssay the new,air jordan chaussure, highly sensitive technology holds promise in giving thosewho live in particularly deadly earthquake zones enough time toevacuate. VOA's Jessica Berman reports.
Like most massiveearthquakes,piumini moncler, experts say the one that hit China's Sichuan province inMay,giubbotti moncler, killing 69,000 people, gave residents no time to evacuate.
According to experts,doudoune moncler, the most modern earthquake detection systems now in use only detect quakes seconds before the event.
Butseismologists, reporting this week in the journal Nature, are usingsensitive tools near Parkfield,air jordan, California on the San Andreas fault todetect minor changes in the earth's crust prior to earthquakes.
They successfully used the equipment hours preceding two earthquakes,giubbotto moncler, one on Christmas 2005 and a smaller one five days later.
Fenglin NiuLead author Fenglin Niu is a seismologist with Rice University in Houston,jordan chaussure, Texas.
Niuand colleagues made direct measurements leading up to the temblors byinserting sophisticated electrical probes one kilometer into the faultthat detected the tiniest stresses in rocks.
"We found thesechanges start about ten hours before [a] magnitude three earthquake andtwo hours before a magnitude one earthquake,moncler quincy," said Fenglin Niu.
The earthquake in China was a magnitude 7.9 in intensity.
Seismologistsnow want to see if they can detect earthquakes with greater precisionby inserting their equipment 10 kilometers into the San Andreas fault.
Niu says they are following up their experiments with seismologists in China and Japan.

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