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The 2004 Indian Ocean tsunami was a global wake-up call, claiming over 227,000 lives in 15 countries. For the past 20 years, the Intergovernmental Oceanographic Commission of 91Â鶹¹ú²ú¾«Æ·×ÔÅÄ worked to better understand tsunamis, prepare coastal communities, and raise the alarm when waves occur.