[Homestead] (New) Arkansas earthquake possibility

bobf bobford79 at yahoo.com
Wed Jan 21 19:50:27 EST 2009


This isn't part of New Madrid. Say's quake could also affect MS & TN. In today's WaPo................

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Scientist: New fault could mean major Ark. temblor


 
Haydar Al-Shukri, director of the Arkansas Earthquake Center at the University of Arkansas at Little Rock, speaks during a luncheon, Wednesday, Jan. 21, 2009 at the University of Arkansas Clinton School of Public Service, in Little Rock, Ark. Al-Shukri said Wednesday that a previously unknown fault near Marianna that lies dormant could reactivate, putting a major gas pipeline at risk in eastern Arkansas. (AP Photo/Mike Wintroath) (Mike Wintroath - AP) 
 


 
By JON GAMBRELL

The Associated Press 
Wednesday, January 21, 2009; 7:29 PM 

LITTLE ROCK, Ark. -- A previously unknown fault in eastern Arkansas could trigger a magnitude 7 earthquake with an epicenter near a major natural gas pipeline, a scientist said Wednesday. 

Haydar Al-Shukri, the director of the Arkansas Earthquake Center at the University of Arkansas at Little Rock, said the fault is separate from the New Madrid fault responsible for a series of quakes in 1811-12 that caused the Mississippi River to flow backward. 

Acres of cotton fields cover the fault west of Marianna, about 100 miles east of Little Rock, but stretches of fine sand mixed with fertile soil gave away the fault's location, Al-Shukri said. Liquefied sand bubbled up through cracks in the earth, while ground radar and digs showed vents that let the sand reach the surface, he said. 

The fault, likely created in the last 5,000 years, sparked at least one magnitude 7 earthquake in its history. Such temblors cause massive destruction in their wake. 

"This is a very, very dangerous (area) at risk of earthquake," Al-Shukri said. "When you talk about (magnitude) 7 and plus, this is going to be a major disaster." 

Al-Shukri did not identify a time frame for the potential earthquake. 

Such a quake would affect Little Rock and neighboring states such as Tennessee and Mississippi, Al-Shukri said. 

The researcher has said a gas pipeline crossed the newly discovered fault. He declined to name the company that owned the pipeline, but said it was building a large line through the area, mirroring the old one's path. 


A map made by the Arkansas Public Service Commission shows an Arkla Energy Resources pipe in the area. CenterPoint Energy Inc., which owns Arkla, did not return a call for comment Wednesday. 

Clint Stephens, the chief of pipeline safety at the commission, said the federal government would oversee any interstate lines. A call to U.S. Department of Transportation's Office of Pipeline Safety was not immediately returned. 

Hundreds of earthquakes occur each year, including several in Arkansas. Most Arkansas earthquakes occur in the state's northeast corner in the New Madrid Seismic Zone, but Al-Shukri said the Marianna fault was not connected because it was too far from the temblors caused by that zone. 

During the winter of 1811 and 1812, a series of three earthquakes with magnitudes of around 8 struck the zone and much smaller temblors continue to hit today. 


http://www.washingtonpost.com/wp-dyn/content/article/2009/01/21/AR2009012103218.html



      


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