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Sentinels for the seas

12.08.2006

The European Union has allocated 45 million euros to set up a tsunami warning system off the coast of Southeast Asia.

Buoys developed at the Geophysical Center in Potsdam (Germany) should become the basis of the system. They will be deployed in the Indian Ocean. Each of them has three sensors that register the approach of a tsunami in different ways. At the bottom, under the buoy, a seismograph is installed that notes the shaking of the seabed, and a pressure sensor that reacts to the passage of a tsunami wave over this section.

A system is mounted on the buoy itself, which, using navigation satellites, marks the rise of the buoy by a tsunami wave (this wave is wider than ordinary storm waves and causes a prolonged rise in the water level, so that it can be distinguished from ordinary waves). These sentinel seas will report signs of an impending disaster to a center under construction in Jakarta (Indonesia).

The only question now is how reliable the data transmission channel from the bottom to the buoy will work - the designers intend to use ultrasound propagating through the water, since the cable may be twisted or torn.

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