The New Madrid fault line has been rumbling again. And while an earthquake expert says the recent series of small quakes isn't unusual, it is a reminder of what the active fault is capable of, the St. Louis Post-Dispatch reports today.
Four small quakes have been centered near New Madrid in southeast Missouri in the past week, according to the U.S. Geological Survey. The largest was a magnitude 3.1 quake on Friday that was felt in parts of Missouri, Arkansas, Tennessee and Kentucky. No damage was reported. The others were a magnitude 1.7 on Dec. 15, a magnitude 1.3 on Dec. 16 and a magnitude 1.4 on Friday.
Robert Hermann of the Earthquake Center at Saint Louis University said a quake large enough to be felt happens about once a month in the region, and quakes with magnitude 2.0 and smaller happen on an almost daily basis.
In fact, according to a map on the Web site for the Center for Earthquake Research and Information in Memphis, Tenn., 15 earthquakes have occurred along or near the fault this month alone, including four on Friday. Only three were above a magnitude 2.0.
The fault line is best known for some of the most violent earthquakes to ever hit the U.S., a series of four in 1811 and 1812. The quakes were estimated at magnitude 7.5 to 8.0, so strong the Mississippi River reportedly flowed backward. Damage occurred as far away as Washington, D.C., and Charleston, S.C.
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Experts have long debated whether the fault line is capable of producing another major earthquake. Hermann isn't willing to bet that it won't, saying there's too much at stake to become complacent.
"Some argue that 1811 and 1812 were one-shot affairs, but it's prudent not to ignore that possibility, and it's prudent to take whatever steps are possible to prepare," he said.
Preparing for an earthquake can be as simple as anchoring cabinets, strapping down a water heater or using museum putty to secure valuables on shelves. Learn more with help from the Institute for Business & Home Safety (IBHS). Download a free earthquake preparedness guide.

