RussellMc wrote:
>
> =A0A Tsunami is essentially a step change in incoming water velocity -
> NOT a normal wave. Once you see what they do and how they work you can
> have a fair idea what you need to do in a given case.
>
> Arrival time would need expert input. Open ocean velocities are v high
> (100-200 kph or even more) and amplitudes low, and speed drop and
> height rises as depth drops. There are std depth/height/speed formulae
> available.

That's a good point. Some mid-ocean ridge is able to generate a
serious tsunami for Christchurch. Generated as far as at Pitcairn or
even Ester Islands, the tsunami would reach Hikurangi Plateau, then
bounded by North Island and Chatham Rise, it could affect the Chch
area.

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