NOAA time line
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Dec. 29, 2004 — NOAA scientists at the Pacific Tsunami Warning Center in Hawaii went to work within minutes of getting a seismic signal that an earthquake occurred off the west coast of Northern Sumatra, Indonesia. NOAA issued a bulletin indicating no threat of a tsunami to Hawaii, the West Coast of North America or to other coasts in the Pacific Basin—the U.S. area of responsibility.

NOAA scientists then began an effort to notify countries about the possibility that a tsunami may have been triggered by the massive 9.0 undersea earthquake. The Pacific Basin tsunami warning system did not detect a tsunami in the Indian Ocean since there are no buoys in place there. Even without a way to detect whether a tsunami had formed in the Indian Ocean, NOAA officials tried to get the message out to other nations not a part of its Pacific warning system to alert them of the possibility of a tsunami. However, the tsunami raced across the ocean at speeds up to 500 mph. Below is the timeline of agency's actions once the undersea earthquake was detected by the NOAA Pacific Tsunami Warning Center in Hawaii.
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We obviously need an international Tsunami warning center and even then the people of the coastal areas near the epicenter will have to rely on being schooled on what to do in the event warnings won't be quick enough.