Tsunami speeds depend on how deep the ocean is. The tsunami that hit on December 26, 2004 was measured at about 800 km/hr, with the Pacific Ocean’s depth averaging at about 5km. Considering some areas of the Pacific Ocean are even deeper, potential future tsunamis in the Pacific may be recorded as even faster!
Actually, speeds of tsunamis were never directly recorded until the Indonesian tsunami. Instead it was indirectly recorded by the time of the source and the time of wave arrival, so technically the fastest tsunami recorded would be the Indonesian tsunami.
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