In the pacific these use deep ocean bouys.
Check out the pacific tsunami warning center and the Alaska and West Coast
warning center. Good places to start your search anyway.
> I was just wondering whether anyone has any information regarding tsunami
> warning systems. I am doing an undergraduate engineering project exploring
> the possibility of passive sonar systems in tsunami detection and would
> welcome any ideas concerning either warning systems currently in use or
any
> that are "in the pipeline".
>
> With thanks
>
> Elizabeth Edwards
>
> [log in to unmask]
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