Most tsunamis are very small out in the ocean, most less then a few centimeters tall.
The post is correct. The apparent height of the wave in deep water is small, yes. However, the wave is very big underwater. (Without a big amplitude, the wave could not transmit a lot of energy.) When the wave reaches shallower water, the bottom of the wave strikes the bottom of the ocean, the apparent size of the wave becomes very big, and then the wave crests and breaks.
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Most tsunamis are very small out in the ocean, most less then a few centimeters tall.
The post is correct. The apparent height of the wave in deep water is small, yes. However, the wave is very big underwater. (Without a big amplitude, the wave could not transmit a lot of energy.) When the wave reaches shallower water, the bottom of the wave strikes the bottom of the ocean, the apparent size of the wave becomes very big, and then the wave crests and breaks.