For more, visit TIME Health. 1  Treating migraines effectively might have gotten a lot easier, according to a new study published this month. 2  Researchers at the Albany Medical Center claim that a new innovative treatment offers chronic migraine sufferers prolonged relief from the debilitating headaches.
That's very fast and it's all because of how deep the water is (thousands of feet) and how much energy the earthquake puts into the tidal wave. So now to directly answer your question, the amount of time it takes for a tsunami to come after an earthquake occurs can be as little as 5 minutes or as long as 24 hours. It just depends on how far away the earthquake was from the coast.
These earthquakes occur anywhere from 60 miles to 12,000 miles. So over there is where you can get a range of times from as little as 5 minutes to as much as 24 hours! So, the average time is about 6 hours, but can be as short as 5 minutes or as long as 24 hours. The time to react simply depends on whether or not a computer was able to detect the earthquake. It's very hard to know how much time you have to react after an earthquake creates a tsunami.