4.7 Earthquake - AR

[ajatwister]

7.2 earthquake in Japan. Tsunami warnings. shaking felt in tokyo... dont know if its thread worthy but something to watch

[bigalpha]

I agree that  starting the process up again could be potentially dangerous.  I believe the government should go ahead and step in for now and start up the process and be the responsible party in case something bad happened.

[StormNine]

 Another 3.5 hit the area near Greenbrier/Guy Arkansas.  Wonder if they are back drilling at that spot, a related aftershock, or is it something else?

[bugalou]

A 4.0 just hit the same area just now!
http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/usc0002lbn.php

[Thundersnow]

I wonder what the status is of the drilling/fracking operations there (anyone know?).

My wife and I visited her cousins in Arkansas a couple of weeks ago.  And, one of her cousins works for a pipeline company.  One thing about these quakes is that they are being measured at around the same depth as the quakes of the New Madrid zone further east.

I was talking to my wife's cousin about it, and he pointed out that those operations only go down to about 3000 or 4000 feet.  But, the quakes are being measured 3-4 miles below the surface.  Based on that, he doubted that it was really the cause...

[WFayetteTN]

I wonder what the status is of the drilling/fracking operations there (anyone know?).

I keep in contact with a friend who is Fire Dispatcher in Conway AR... I asked her a couple days ago if they had started up the fracking again, because of the 3+M earthquakes Im getting usgs emails again...   And she said "Not that we have heard. But theres been a lot of shaking going on."

Greenbrier is about 10 mi north of Conway. And Guy is about 7 mi north of Greenbrier.

[Thundersnow]

It seems another Richter 4 event has just occurred in the past hour.  

Looking for more details...

[Thundersnow]

4.2 on the Richter Scale... recorded at 9:56 AM local time...

Magnitude 4.2
Date-Time Friday, April 08, 2011 at 14:56:32 UTC
Friday, April 08, 2011 at 09:56:32 AM at epicenter
Time of Earthquake in other Time Zones
 
Location 35.261°N, 92.362°W
Depth 6.3 km (3.9 miles)
Region ARKANSAS
Distances 4 km (3 miles) NE (34°) from Greenbrier, AR
8 km (5 miles) SE (138°) from Twin Groves, AR
8 km (5 miles) SSW (200°) from Guy, AR
21 km (13 miles) NNE (23°) from Conway, AR
58 km (36 miles) N (357°) from Little Rock, AR
419 km (260 miles) SSW (207°) from St. Louis, MO
 
Location Uncertainty horizontal +/- 0.4 km (0.2 miles); depth +/- 0.3 km (0.2 miles)
Parameters NST= 18, Nph= 24, Dmin=4 km, Rmss=0.19 sec, Gp= 68°,
M-type="Nuttli" surface wave magnitude (mbLg), Version=B
Source Cooperative New Madrid Seismic Network
 
Event ID nm040811m

http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/nm040811m.php

[bugalou]

Past two days.  Wow!


Thursday April 7 2011, 09:48:00 UTC 31 hours ago Arkansas 2.2 4.0
Thursday April 7 2011, 10:03:34 UTC31 hours ago Arkansas 2.5 3.2
Thursday April 7 2011, 23:11:09 UTC18 hours ago Arkansas 4.0 2.6
Thursday April 7 2011, 23:11:09 UTC18 hours ago Arkansas 3.9 6.1
Friday April 8 2011, 00:28:22 UTC16 hours ago Arkansas 2.9 5.0
Friday April 8 2011, 00:28:24 UTC16 hours ago Arkansas 2.9 2.2
Friday April 8 2011, 03:27:58 UTC13 hours ago Arkansas 3.2 5.0
Friday April 8 2011, 03:27:58 UTC13 hours ago Arkansas 3.2 5.5
Friday April 8 2011, 03:30:34 UTC13 hours ago Arkansas 2.2 4.9
Friday April 8 2011, 04:35:03 UTC12 hours ago Arkansas 2.9 5.3
Friday April 8 2011, 04:35:04 UTC12 hours ago Arkansas 2.9 3.0
Friday April 8 2011, 04:35:04 UTC12 hours ago Arkansas 2.9 4.6
Friday April 8 2011, 06:47:43 UTC10 hours ago Arkansas 2.5 3.5
Friday April 8 2011, 07:57:33 UTC9 hours ago Arkansas 2.4 4.6
Friday April 8 2011, 08:17:08 UTC9 hours ago Arkansas 2.4 5.2
Friday April 8 2011, 09:13:57 UTC8 hours ago Arkansas 2.5 4.6
Friday April 8 2011, 10:12:53 UTC7 hours ago Arkansas 3.0 5.0
Friday April 8 2011, 10:12:53 UTC7 hours ago Arkansas 3.0 5.2
Friday April 8 2011, 12:46:39 UTC4 hours ago Arkansas 2.6 3.5
Friday April 8 2011, 13:16:48 UTC4 hours ago Arkansas 2.6 6.0
Friday April 8 2011, 14:56:32 UTC2 hours ago Arkansas 4.2 5.0
Friday April 8 2011, 14:56:32 UTC2 hours ago Arkansas 3.9 6.3
Friday April 8 2011, 15:36:06 UTC107 minutes ago Arkansas 2.4 3.0
Friday April 8 2011, 16:46:19 UTC 37 minutes agoArkansas 3.5 6.2
Friday April 8 2011, 16:46:19 UTC 37 minutes agoArkansas 3.5 4.9


That's a whole lot of activity for a 24-48 hour window!