Usually within one day of sea water will be reduced twice. Within one hour it takes 6 times, but if the water is unusual in water 10 minutes, reduced to 100-200 m wave tsunami will occur anyway.
Typically, within a day the sea will be reduced twice. The once spent six hours if the water is an unusual 10-minute water drops to 100-200 meters to the tsunami it.
Usually within one day the sea will fall twice in a single take 6 hours. But if water is 10 minutes into the abnormal water 100-200 meters will cause tsunami.