Tsunami Review: A Tsunami Is Not a Tidal Wave and the Sea Goes Out First

Tsunami Review: A Tsunami Is Not a Tidal Wave and the Sea Goes Out First

It is the whole depth of the ocean moving, and the water withdrawing is the last warning you get

Tsunami holds a 4.6 from two thousand four hundred and sixty-three people, charges thirty to ninety pounds, and the word in the name is Japanese, and it means harbour wave.

It has nothing to do with tides

Which is why tidal wave is wrong, and why the scientists abandoned it.

Because a tide is caused by the moon.

And a tsunami is caused by the seabed moving – by an earthquake, or a landslide, or a volcano – and it has no more to do with the moon than an earthquake does.

A tsunami is not a wave on the sea. It is the whole sea, moving.

And it is not a wave in the ordinary sense

Which is the fact that reorganises everything.

Because an ordinary wave is surface – the water goes round in circles, and the energy travels, and the water very largely stays where it is.

Go down thirty feet and there is nothing happening.

And a tsunami is the entire depth of the ocean, moving.

From the seabed to the surface. Miles of water, displaced.

Which is why it is invisible at sea

Because in deep water, all that energy is spread through a colossal depth – and the wave at the surface may be only a foot or two high.

A ship can pass straight over one and nobody on board notices.

And it is travelling at something in the region of five hundred miles an hour – the speed of a jet.

And then it reaches the shallows

And the front slows down, because the seabed is dragging on it.

And the back of it does not.

So the water piles up. The energy has nowhere to go but upward.

And it arrives not as a breaking wave but as a wall of water that does not stop – because it is not a wave passing through. It is the sea, arriving, and continuing to arrive.

And the sea goes out first

Which is the warning, and it is the last one you get.

Because if the trough arrives before the crest, the water withdraws – suddenly, and enormously, exposing the seabed.

And people walk out onto it to look at the fish.

In 2004, a ten-year-old English girl on a beach in Thailand recognised it, because she had been taught it in a geography lesson two weeks before.

She told her mother. The beach was cleared. Everybody on it lived.

Which is the finding

Eight postcodes and thirteen hundred and thirty-five articles.

Every community that has had nowhere to go has built its institutions in whatever room was available – and the most valuable thing anybody ever built was a school, and a girl remembered a lesson.

And it comes in a train

Which is the last thing, and it is why people die.

Because a tsunami is not one wave.

It is a series of them, arriving over hours – and the first is frequently not the largest.

So the water comes, and it goes, and people return – to look for relatives, to see the damage, to recover what they can.

And the second wave, or the third, is bigger.

The Prat’s editorial desk regards this as the cruellest piece of physics in this survey: the event is designed, by nothing at all, to kill the people who came back to help.

Verdict

Excellent, expensive, strong number.

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