The wave will only last as long as the pressure wave from the earthquake where it originated. When it runs out of steam, so too will the tsunami.
These things are unpredictable because their course and energy are dependent on factors like subsurface rock density and type. For example obstructions, like islands, can cause the pressure wave from the earthquake to wrap around the obstruction, leaving some areas unaffected and others devastated, even though they are neighbours. Obstructions also cause the wave to lose energy faster.
I think for some of us here though, we tend to get a little blase because we have grown up with these things. Where I was born we got earthquakes *all the time* and in my teen years we were on the coast. Our school was literally 20 metres from the beach, and so we were educated about tsunami and still people would, when there was one, go down and grab exposed shellfish when the harbour emptied out.
That was in Doubtless Bay by the way.
Alan
Alan
2005 Disco 2 HSE
1983 Series III Stage 1 V8
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