BBC NEWS | Science/Nature | Indian Ocean tsunami warning system: "DETECTING A TSUNAMI
Seismic gauges can detect the earthquakes or volcanic eruptions which may cause a tsunami.
But as only a small proportion of strong earthquakes produce a tsunami, a warning system based solely on seismic data is prone to producing false alarms.
Other sea-based instruments are needed to help scientists decide if a tsunami has been triggered.
These fall into two main types: pressure recorders in the deep ocean and tide gauges monitoring sea-level at the coast."
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