Remap of Dallas-area quakes shows fault closer to fracking wells than thought

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By ANNA KUCHMENT AND AVI SELK

Staff Writers


Published: 06 February 2015 11:22 PM

Updated: 07 February 2015 08:45 AM




Scientists finally have a rough picture of the ancient fault that’s been rattling the Dallas area, and the fissure isn’t where the public thought it was.

Armed with more equipment and better data, SMU scientists have relocated dozens of quakes on the federal government’s imprecise maps. The team released a new map on Friday that shifts the epicenters of nearly all of last month’s temblors, arranging them in a neat line that shadows a fissure miles beneath the earth.

And while the team has just begun to study that fault, they already have some early hints about its nature.

It’s not beneath the old Texas Stadium site, as federal maps suggested.

It’s small (for a fault) and appears to be quieting down after tossing off about four dozen quakes in a year. But it could still produce a tremor much more powerful than any Dallas has yet seen.
MORE
http://www.dallasnews.com/news/local-news/20150206-remap-of-dallas-area-quakes-shows-fault-closer-to-fracking-wells-than-thought.ece

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1. dumbasses

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2. More information on the fault of the failed rift system, formed long ago.

http://www.livescience.com/29770-oklahoma-eroded-quachita-mountains.html

http://geology.geoscienceworld.org/content/13/11/790.abstract
Ouachita trough: Part of a Cambrian failed rift system.
snip
Overall sedimentological results suggest that the Ouachita trough was a relatively narrow, two-sided basin throughout most and probably all of its existence and never formed the southern margin of the North American craton. Regional comparisons suggest that it was one of several basins, including the Southern Oklahoma aulacogen, Reelfoot Rift, Illinois Basin, and Rome trough, that formed as a Cambrian failed rift system 150 to 250 m.y. after initial rifting along the Appalachian margin of the North American craton. more at link.


http://mysite.du.edu/~jcalvert/geol/ouach.htm
The Ouachita System