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GPS could offer better fault line mapping

Satellites help to pinpoint highest-risk earthquake zones.

Global positioning systems (GPS) could help identify the places most at risk of devastating earthquakes, say researchers who have used the technology to identify high-hazard ‘locked zones’ that can spawn giant quakes.

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Posted by on May 25, 2007
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"GPS networks send altitude and location readings to satellites ..."
You do not need to send any information to satellites to measure the drift.
Indeed, as a GPS user, you can only _receive_ signals from GPS satelites.
For more details see:
http://quake.wr.usgs.gov/research/deformation/gps/aboutgps/index.html#How%20does%20it%20work

Posted by: Pawel | May 30, 2007 06:21 PM

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