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From New Scientist - Latest Headlines:
A "GPS shield" that works in real time could save lives by quickly warning of potential tsunamis.
The German-Indonesian Tsunami Early Warning System (GITEWS) is being developed by a team led by Jörn Lauterjung of the National Research Centre for Geosciences in Potsdam, Germany. Unlike a GPS method proposed last year, which detects seismic waves transmitted through the Earth's crust to distant receivers, the new ground-based system takes real-time measurements of vertical ground motion - the type of fault movement more likely to produce tsunamis.
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