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"A tide station has one or more calibrated instruments, called tide gauges, which have the ability to measure long and short term changes in sea level from astronomical tides or long period waves such as tsunami waves of surges.

Tide stations in the ITWS telemeter their data via satellite to PTWC and other regional warning centers."

Citation source: http://www.drgeorgepc.com/TsunamiFAQ.html