In Hawaii, low-tech warning systems alert residents to tsunami threat

Sites like Twitter and Google’s crisis center have proved indispensible during the aftermath of the devastating tsunami that struck Japan.

To warn its residents of the tsunami, officials in Hawaii dispatched low-tech warning systems. When the tsunami warning was issued for the Pacific around 9:30 p.m. local time in Hawaii, sirens blared across the islands and trucks with loud speakers drove through neighborhoods.

Mindy Pennybacker, a Huffington Post blogger, reported:

A truck is circling our neighborhood, with a man giving an emergency management message over a loudspeaker: ‘Extremely dangerous waves are expected at 3 am. Occupants of high-rise buildings are advised to go to the third floor or above without delay.’

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