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The original item was published from 3/23/2015 10:05:35 AM to 3/24/2016 12:05:02 AM.

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County Administrative Office

Posted on: March 23, 2015

[ARCHIVED] Humboldt, Del Norte and Mendocino counties to test tsunami warning systems

Humboldt County will participate in the annual live code test on Wednesday as part of Tsunami Preparedness Week, along with Del Norte and Mendocino Counties. From approximately 11 a.m. until noon, tsunami sirens will be activated, along with other emergency notification systems, including NOAA weather radio, television, and radio test alerts.

Individuals who are registered to receive alerts through county, city, or organizational mass-notification systems may also receive voice, text, and/or email notifications. By testing emergency notification systems it helps to ensure that those systems are operational in case of an actual emergency, and lets potential recipients of emergency messaging know what to expect. The Civil Air Patrol will also be performing a coastal overflight with audio, weather permitting.

Emergency notification systems are intended to warn individuals of potential or occurring emergencies that might affect the general population or require immediate action. In the event of a tsunami affecting the Humboldt County coast, mass notification systems and sirens are most effective in warning of distant-source tsunamis created by seismic activity not felt in Humboldt County. A local-source tsunami may arrive in as few as 10 minutes following a major local earthquake.

It is important for all residents and visitors to know that strong ground shaking lasting 20 seconds or longer is our warning to immediately evacuate tsunami zones, before checking to find out if an advisory or warning has been issued. While an earthquake is the most likely natural warning sign that a tsunami is coming, other natural warnings include the ocean water moving far out from the coast, exposing the sea floor, or hearing an unusually load roar from the coast.

If you are in a tsunami evacuation zone and notice any of the above warnings, move to higher ground or inland as soon as it is safe to do so. Local tsunami zone maps created by the Redwood Coast Tsunami Work Group are available on the Humboldt State University website.

Know your zone!

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