The U.S. likely was able to prevent deaths in Hawaii from the tsunami triggered by last year's earthquake in Japan because the U.S. tsunami-tracking network accurately predicted the flooding that resulted, according to experts. Government agencies stepped up their tsunami-detection efforts after the 2004 earthquake and tsunami in the Indian Ocean, which was estimated to have killed about 230,000 people. Scientists intend to place tsunami-tracking buoys in seismic hot spots close to U.S. coasts, such as the Cascadia subduction zone.

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