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May 19, 2013

The Big One: Preparing for mid-America earthquake

(Continued)

Not everyone thinks the New Madrid fault will produce another big earthquake. Seth Stein, a geologist at Northwestern University, has argued that the small quakes occurring along the fault are not the kind that suggest the earth is gathering energy for a large one.

“He’s a smart guy,” said Patterson. “But it’s interesting that you have to go 500 miles away from the fault to find a scientist who disagrees with the consensus” that another New Madrid quake is inevitable.

At the same time, Patterson and others concede it is difficult to explain why the faults in the central United States are active at all.

Disaster preparedness officials – encouraged by the federal and state governments – are getting ready for a large quake anyway. The Federal Emergency Management Agency (FEMA) sponsors events like the Great Shake-Out and Earthquakes Mean Business, instructing communities and businesses the protective mantra of, “Drop, Cover and Hold On.”

Disaster officials also collaborate on regional drills. The Mid-America Earthquake Center’s 2008 scenario is one example. Another is the Central United States Earthquake Consortium, a planning agency that represents eight states, which is scheduling a large-scale exercise next year.

Earthquake preparedness is not always widely embraced, however, at least as a matter of policy. Developers in Memphis and Shelby County, Tenn., for example, are engaged in a protracted debate over whether to update the local building code to require tougher material standards such as framing clips that help secure a house’s frame to its foundation. Engineers say the costs of including this hardware in homes would be minimal. The developers think otherwise.

What’s not in dispute is that the region’s building codes are untested. Almost every state that would be affected by a quake on the New Madrid fault has a building code. But building codes have only been earthquake-oriented for 20 years or so. And there hasn’t been a magnitude 6 or greater earthquake in the area since 1895, when a 6.7 hit in Charleston, Missouri.

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