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Old 01-18-2015, 03:59 AM
 
348 posts, read 830,297 times
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The earthquakes are very small and are not a big concern. They have not been happening around Lubbock, but in the DFW region. I've experienced two. The first was very small; it felt like a heavy door being slammed nearby, and sounded about like a heavy rock had been dropped on concrete. The second was bigger, about 4 points. The floor shook for a couple of seconds and it was over. There has been some minor damage, but only near the centers of the biggest quakes, not frequent or widespread.

The Balcones Fault is very unlikely to become active. The quakes around here are related to the mineral production. Such small quakes can happen anywhere in the world at any time. They happen more often because of the gas production activity, probably mostly due to the injection wells. There's always pressure at a fault (and faults are everywhere), so when you mess with things (crack rocks, inject lubricating fluids, etc.) the pressure will be more likely to be released. I compare it to a book that's hanging over the edge of a table, just short of falling. A small amount of pressure will cause the book to fall. The impact of the book hitting the floor is much bigger than the small push needed to make it fall. Many faults are near the point of moving, and are pushed over the edge by applications of relatively small forces.

There are places with no history of earthquakes where they became common after the gas activity started. There are places that have always had rare earthquakes where the activity is now thousands of times more frequent. The only reason to deny the obvious conclusion is to defend the gas production, which I think is unwarranted. The gas production does a lot of good, and even having experienced a couple of quakes I don't think it's reason to stop the production activity. They could perhaps improve some practices, such as not putting injection wells right along known faults (that happened once and it set off a series of quakes), but I see no reason to go into a panic and stop all of the production.

Again, this doesn't affect the Lubbock area at all. Also, the Caprock Escarpment is erosional, not tectonic. The escarpment formed because the land east of it was washed away, not because of one side moving up over the other, which is how the Balcones formed.
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Old 01-18-2015, 03:57 PM
Status: "College baseball this weekend." (set 3 days ago)
 
Location: Suburban Dallas
52,681 posts, read 47,932,189 times
Reputation: 33839
Quote:
Originally Posted by KerrTown View Post
That's scary. It goes along I-35 all the way to San Antonio, the same one that created the Hill Country. I would not want to live in DFW, Waco, Austin, or S.A. if that fault becomes active. It's like our version of the San Andreas!
And goes all the way up to Sherman.
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Old 05-04-2015, 04:06 PM
 
268 posts, read 290,098 times
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The New Madrid is, I think, the biggest concern. No idea if it would directly hit in Lubbock:

Will The Coming New Madrid Earthquake Split The United States In Two? | JEWSNEWS
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Old 05-08-2015, 04:22 AM
 
268 posts, read 290,098 times
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4 point is Dallas area last night, not a small one.
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Old 05-08-2015, 10:54 AM
 
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4 point?
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Old 05-09-2015, 02:11 PM
 
268 posts, read 290,098 times
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Quote:
Originally Posted by Mark Senior View Post
4 point?
Yes, that's what it said on the news:

http://thescoopblog.dallasnews.com/2...th-texas.html/

4.0 is what is reported. What are you rolling your eyes about? I said "the Dallas area."
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Old 05-09-2015, 08:06 PM
 
348 posts, read 830,297 times
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We had a four-pointer. It shook for several seconds and sounded like rolling thunder. It caused some damage to poorly built structures near the center. It was my third earthquake. A lot of people didn't notice earlier ones, including me; I've missed a lot of them. This one was hard not to notice. It woke people up and got a lot of attention.
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