Krakatoa
On August 27, 1883 the volcanic island of Krakatoa erupted with sound so loud that it was heard over 3,000 miles away. Anyone hearing the explosion at a distance of 3,000 miles was actually receiving the audio about 4 hours after the event (4.689 seconds for sound to travel 1 mile at speed of sound). The speed of sound is about 25% faster than the speed of a tsunami wave, so anyone hearing the explosion had a brief window of time to escape the deadly waves that killed more than 36,000 people. Of course, hearing and understanding are two very different things.
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