Tsunami Preparedness

The magnitude 7.4 earthquake that hit Mexico yesterday may not have resulted in any tsunamis for the U.S., but this does not diminish the tsunami threat.

Major tsunamis are produced by large earthquakes (greater than magnitude 7 on the Richter scale) and those with shallow focus (<30km depth), according to NOAA.

Since 1850 tsunamis have been responsible for the loss of over 420,000 lives and billions of dollars of damage to coastal structures and habitats, NOAA says. Most of these casualties were caused by local tsunamis that occur about once per year somewhere in the world.

Tsunamis also result from distant earthquakes. Last year’s magnitude 9.0 Japan earthquake and the 2010 Chile earthquake caused tsunami strikes in Hawaii, Alaska, Washington, Oregon, and California, for example.

Next week is National Tsunami Preparedness Week, so now is a good time to remind ourselves of the risk and what to do if a tsunami happens.

By the way, catastrophe modeler EQECAT estimates that yesterday’s Mexico quake will result in insured losses of less than $100 million.

Check out this I.I.I. release for more information on earthquake insurance Mexico and a chart of the most costly world earthquake/tsunamis.

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