Six Hundred Aftershocks and Still Shaking

2.3 magnitude aftershock Thursday

Friday, Nov 4, 2011  |  Updated 3:14 PM EDT
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Needles at the U.S. Geological Survey jumped again on Thursday morning, when a 2.3 magnitude aftershock rattled Louisa County.

Geological Survey staffers said in a lecture this week they've actually recorded over 600 aftershocks following the August 23 quake.

Staff geologist and Mineral, Virginia resident Mark Carter lectured on the Virginia quake's aftershocks on November 2 in Fairfax.  The lecture was also shared via the USGS twitter feed.

The geologist said that in central Virginia, seismic activity is "somewhat regular."  However, the strength of the August 23 quake had not been seen in a century, and the damage has been unprecedented.

"It was a miracle that there were no casualties given the damage we found," he wrote.

The Geological Survey deployed over 200 portable seismographs around the state to measure aftershocks.  The equipment indicates that aftershocks are taking place at various depths and locations, along two Virginia faults.

As evidenced by Thursday's quake, the aftershocks will continue.

Carter tweeted: "So far, we've had more than 600+ aftershocks, and it really begins to wear on you after awhile."

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