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Tuesday, July 18, 2006 

Signs of an approaching tsunami

The following have at various times been associated with a tsunami:

  • An earthquake may be felt.
  • Large quantities of gas may bubble to the water surface and make the sea look as if it is boiling.
  • The water in the waves may be unusually hot.
  • The water may smell of rotten eggs (hydrogen sulfide) or of petrol or oil.
  • The water may sting the skin.
  • A thunderous boom may be heard followed by
    • a roaring noise as of a jet plane
    • or a noise akin to the periodic whop-whop of a helicopter,
    • or a whistling sound.
  • The sea may recede to a considerable distance.
  • A flash of red light might be seen near the horizon.
Source: http://en.wikipedia.org/wiki/Tsunami#Signs_of_an_approaching_tsunami