What is a tsunami warning system?
Quick Answer
A tsunami warning system uses seismographs, ocean-floor pressure sensors and tide gauges to detect undersea earthquakes and abnormal waves and alert coastal populations.
The Full Story
The Pacific Tsunami Warning Center, established in Hawaii in 1949 after a deadly 1946 tsunami, monitors seismic activity across the Pacific. When a large undersea earthquake is detected, instruments called DART buoys (Deep-ocean Assessment and Reporting of Tsunamis) on the ocean floor measure pressure changes from passing waves and transmit data via satellite. If a tsunami is confirmed, warnings are issued to coastal areas, giving people time to move to higher ground. After the devastating 2004 Indian Ocean tsunami, which killed over 230,000 people with no warning, systems were expanded to the Indian Ocean, Caribbean and Mediterranean.
Key Facts
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Suggested video title for this topic:
"Buoys on the ocean floor — how tsunami warnings work"