Felt that one! (4.7 just West of Woolly Hollow)

[DeBo]

I just said that the Ark Geological Survey hasn't ruled out the deep injection wells. They say that while there is no discernible link between earthquakes and gas production wells, there is “strong temporal and spatial” evidence for a relationship between these quakes and the injection wells.

The well that I mentioned injects at 2.3 miles deep; the quake was at 2.4. I don't know the formation off hand.

This earthquake swarm is now much larger, with greater numbers and more intense quakes, than any in past records.

I'm not a geologist either. I just know a couple of geologists and I studied physical geography at one time. :)

[FarPastGone]

If I have time I will try and find out the formation tomorrow and report back. I don't discount the possible connection between injection wells and the spurt of increased earthquake activity. I am sure you have seen the same kitschy graphic from the Arkansas Geologic Survey as I have on the Enola Swarm, but it says that there were several earthquakes in the magnitude 4-4.5 range and a total of 40,000 earthquakes over the period (1982-data ended in October 2006). The Guy Swarm has an estimated 800 earthquakes associated with it since September, so if we were to double that to get a yearly figure and then times by a period of 24 years, the Guy Swarm is on pace (at its current rate) for 38,400 earthquakes in 24 years. I don't know the exact characteristics of the Enola Swarm, but frequency wise the Guy Swarm does not appear to be greater. Now spatially and frequency of earthquakes magnitude 3+ and bigger may be a different story.

Either way, I think it is safe to say that pumping millions of gallons of water deep within the Earth, in an area with a history of unexplained earthquake events, may lead to deleterious results.

[Joe Purdy]

It tricked me.
I was in the bathroom getting ready for bed and it sounded and felt like a big heavy dumptruck passing on the road outside the house. For some reason, I hear lower frequency noises better in the bathroom than anywhere else in the house.
I yelled in to Melanie and asked if she heard or felt that thunder from the approaching storm... She said that she had. I stepped outside and could just see the lightening on the horizon coming our way. No sound though. thunder didn't start until 20 minutes later.

Earthquake -1 , Joe Purdy- 0

We'll meet again earthquake...we'll meet again...

[DeBo]

As some may already know, AOGC staff will be recommending the shutdown of two injection wells at a hearing on Friday. These two wells appear to be linked to our recent quakes.

See the story here:

http://thecabin.net/news/local/2011-03- ... operations" onclick="window.open(this.href);return false;

[Shark Attack]

Got my insurance rider today. Not that expensive.

[Shark Attack]

Joe, I had a similar experience the other day while I was appraising some property near Damascus. I was way out on a little goat trail and thought I heard a big truck speeding down the road and when I turned and looked there was no dust, but a bunch of dead leaves falling to the ground. A big rumbling swish.

[prophet]

sounds like they prevented a disaster. if that fault had popped dry it would have been much worse.