How Do Earthquake Early Warning Systems Work? One year on from the tsunami, this is a guide to what is planned and what is already in place. A summit has now decided to create a tsunami early warning system for the Indian Ocean. By Jane J. Lee, National Geographic. If a tsunami formed along the Cascadia Subduction Zone off the coast of Oregon, residents might have just 20 to 30 minutes to get to safety. How Does a Tsunami Warning System Work. Warnings go out to all countries in the area likely to be affected, but also to other warning systems around the world. in Palmer, Alaska, serves as the regional Tsunami Warning Center tsunami warning information to national authorities in the Pacific Earthquake and tsunami warning systems both monitor the same thing: seismic waves. The Tsunami Warning System (TWS) in the Pacific, comprised of 26 participating international Member States, has the functions of monitoring seismological and tidal stations throughout the Pacific Basin to evaluate potentially tsunamigenic earthquakes and disseminating tsunami warning information. Seismic data takes the Earth's pulse directly, so when the earth shakes, we get immediate feedback. A tsunami watch with additional predicted A warning may begin with an alert by a geological society that an earthquake large enough to disturb the ocean’s surface (for instance, magnitude 7.0 or higher) has occurred. The small tools that are found by engineers and other professionals are also hugely useful for caution and safety. To ensure early detection of tsunamis and to acquire data critical to real-time forecasts, NOAA has placed Deep-ocean Assessment and Reporting of Tsunami (DART®) stations at sites in regions with a history of generating destructive tsunamis. It is made up of a network of seismic-monitoring stations and sea-level gauges. Tsunami Information Center, part of the Intergovernmental Weather Service operates two tsunami warning centers. as the regional Tsunami Warning Center for Hawaii and as a national/international image copyright AFP It consists of two equally important components: a network of sensors to detect tsunamis and a communications infrastructure to issue timely alarms to start evacuation before the big waves reach the land to let the people to rush to safety. Pacific Basin. Oceanic and Atmospheric Administration, Tsunami watch, warning and information bulletins issued by The Pacific Tsunami Warning System was established in 1949. If First, a key concept – there are two sources of tsunami for Washington coastal waters a di– stant source and a local source. The only way to effectively mitigate the impact of a tsunami is through an early warning system. The Pacific Tsunami Warning Center, located near Honolulu, Hawaii, was established in 1949, three years after a tsunami generated by a submarine earthquake near the Aleutian Islands struck the island of Hawaii around Hilo, killing more than 170 people. The 8.3-magnitude earthquake that struck off Illapel, Chile, on Thursday has once again highlighted the importance of tsunami warning systems in the world’s oceans. tidal stations throughout the Pacific Basin to evaluate potentially Based on this seismic information from GA, the Bureau runs a tsunami model to generate a first estimate of the tsunami size, arrival time and potential impact locations. The Pacific Tsunami Warning Center (PTWC) is the operational center “But they have a long oral history, a long oral tradition of what to do when the ground shakes for a really long time.” The NOAA Weather Radio System, based on a large number of How the DART Network helps forecasting: When a tsunami event occurs, the first information available about the source of the tsunami is based only on the available seismic information for the earthquake event. Both of the tsunami warning centers use earthquake information, tide gauges and now a new tool from NOAA – tsunami detection buoys, developed by NOAA’s Pacific Marine Environmental Lab. National These detect earthquakes and abnormal changes in sea level and help scientists decide whether a tsunami has been triggered by an earthquake. 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