Author Topic: 4.7 Earthquake Hits Oklahoma  (Read 21344 times)

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Offline AWL

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #25 on: November 06, 2011, 10:55:03 AM »
Wonder if the Arbuckles and Sandstone Hills in that area have anything to do with your inability to feel the quakes.  Maybe acting as a bit of a buffer?
Could be. Seems odd that we haven't felt anything.

Offline Harryca

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #26 on: November 06, 2011, 02:19:37 PM »
5.6 aftershock?! Was there any structural damage? Thats a strong one! This is about as crazy as the East Coast one!

Yes, there was structural damage reported.

Quote

Oklahoma's Strongest Earthquake Causes Damage

The 5.6-magnitude earthquake that hit Oklahoma at 10:53 p.m. EDT Saturday has caused significant damage to the southern parts of Lincoln County.
 
Kjrh.com reports that the air conditioning ducts of the Prague Library have broke through the ceiling.

The Lincoln County Emergency Management officials have reported that chimneys have crashed through the roofs of several homes. The crews are reported to be out assessing damage in the area.
 
Roads in the county have buckled and KJRH reports that Highway 62 near County Road 3470 has been affected, in addition to other county roads.
 
As of Sunday morning, only one minor injury has been reported. According to CNN.com, a man tripped and hit his head against a wall while trying to flee his home when the earthquake struck.

Rest of article: http://www.accuweather.com/blogs/news/story/57408/oklahomas-strongest-earthquake-1.asp?partner=accuweather

Offline IMADreamer

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #27 on: November 06, 2011, 02:24:26 PM »
This is probably a stupid question but would the 5.6 be an aftershock or the main quake?  With the earlier smaller quake being a precursor to the 5.6?
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Offline Harryca

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #28 on: November 06, 2011, 04:36:12 PM »
I would think that now would be a good time (especially those people in and around Oklahoma) to consider joining the Quake Catcher Network http://qcn.stanford.edu/ .  When I look at the QCN map below, there is not one QCN sensor set up in Oklahoma.  The closest ones around are Dallas, TX and El Dorado, KS.  And don't worry if there might already be a QCN sensor set up in your area, QCN is one of those projects where more is better.

http://qcn.stanford.edu/sensor/maptrig.php?cx=35&cy=-97&timeint=W

Offline Weather Display

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #29 on: November 06, 2011, 05:35:38 PM »
Quote
This is probably a stupid question but would the 5.6 be an aftershock or the main quake?  With the earlier smaller quake being a precursor to the 5.6?
I think they are aftershocks from historicaly much bigger quakes?
(i.e very 50 or 100 years you might get a big aftershock)
and are related to the earth still settling a bit after the last ice age maybe? (i.e after the weight of the ice sheet has gone (this area might even have been the furtherest south extenct of that ice sheet?)
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Offline WeatherHost

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #30 on: November 06, 2011, 05:51:45 PM »
CNN is saying something like 30 aftershocks so far.

Offline smorris

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #31 on: November 06, 2011, 05:58:14 PM »
I would think that now would be a good time (especially those people in and around Oklahoma) to consider joining the Quake Catcher Network http://qcn.stanford.edu/ .  When I look at the QCN map below, there is not one QCN sensor set up in Oklahoma.  The closest ones around are Dallas, TX and El Dorado, KS.  And don't worry if there might already be a QCN sensor set up in your area, QCN is one of those projects where more is better.

http://qcn.stanford.edu/sensor/maptrig.php?cx=35&cy=-97&timeint=W

Cool! Thanks for the link. Signing up now. (I'm on a concrete slab on an ancient sand beach, so that should be pretty sensitive)
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Offline Bunty

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #32 on: November 06, 2011, 06:14:18 PM »
This is probably a stupid question but would the 5.6 be an aftershock or the main quake?  With the earlier smaller quake being a precursor to the 5.6?
I think they're calling the 4.7 quake that happened early that morning a foreshock.

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Offline Downlinerz2

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #33 on: November 06, 2011, 06:23:47 PM »
    I have heard in the past of quakes where there were larger after-shocks than the primary.

Offline Weather Display

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #34 on: November 06, 2011, 06:28:10 PM »
it does become important for insurance...i.e is an afershock to be added to damage claims from earlier aftershocks or should it be declared, for insurance purposes, as a separate quake in its own right, i.e a separate insurance claim
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Offline WeatherHost

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #35 on: November 06, 2011, 06:45:29 PM »
Quote
Oklahoma typically had about 50 earthquakes a year until 2009. Then the number spiked, and 1,047 quakes shook the state last year, prompting researchers to install seismographs in the area.

http://www.journaltimes.com/news/national/us/big-quake-follows-increase-in-oklahoma-rumblings/article_bbf649b1-d50c-5991-abc8-12216d58f3ee.html


Offline Downlinerz2

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #36 on: November 06, 2011, 06:50:00 PM »
    Hope the activity does not spread up to the Yellowstone system. 8-[ [-o< ;)

Offline Old Tele man

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #37 on: November 06, 2011, 07:47:56 PM »
    Hope the activity does not spread up to the Yellowstone system. 8-[ [-o< ;)
...and cause a super-volcano BOOM!
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Offline BigOkie

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #38 on: November 06, 2011, 08:08:30 PM »
This is probably a stupid question but would the 5.6 be an aftershock or the main quake?  With the earlier smaller quake being a precursor to the 5.6?
I think they're calling the 4.7 quake that happened early that morning a foreshock.

Yeah, that's what I heard them call it also.
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Offline Weather Display

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #39 on: November 06, 2011, 08:14:22 PM »
I would suggest I dont think they know a quake is a foreshock until afterwards (i.e its followed by a bigger quake)
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Offline SlowModem

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #40 on: November 06, 2011, 08:54:56 PM »
    Hope the activity does not spread up to the Yellowstone system. 8-[ [-o< ;)

The caldara will take care of that!   :shock:
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Offline Harryca

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #41 on: November 06, 2011, 11:05:09 PM »
This is probably a stupid question but would the 5.6 be an aftershock or the main quake?  With the earlier smaller quake being a precursor to the 5.6?

From the Leonard Geophysical Observatory (Oklahoma Geological Survey) website:

Quote
Preliminary Earthquake Report, November 5, 2011

On November 5, 2011 at 2:12 AM CDT (07:12:45.4 UTC) an magnitude 4.7 earthquake occurred in Lincoln County, Oklahoma.  This turned out to be a foreshock to a much larger earthquake.  The mainshock occurred at 10:53 PM CDT (11-6 03:53:10 UTC).  The earthquakes occurred about 6 miles northwest of Prague and 5.2 miles southeast of Sparks.
 

More info here: http://www.okgeosurvey1.gov/
« Last Edit: November 06, 2011, 11:08:17 PM by Harryca »

Offline d_l

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #42 on: November 07, 2011, 12:17:58 AM »
Cracks in a road near the epicenter: http://www.reddirtreport.com/Story.aspx/20300
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Offline WeatherHost

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #43 on: November 07, 2011, 07:00:39 AM »
Quote
Scientists are puzzled by the recent seismic activity. It appeared the latest quake occurred on the Wilzetta fault, but researchers may never know for sure. Earthquakes that hit east of the Rocky Mountains are harder to pinpoint because the fault systems are not as well studied as major faults like the San Andreas in California.

Arkansas also has seen a big increase in earthquake activity, which residents have blamed on injection wells. Natural gas companies engaged in hydraulic fracturing, or fracking, use fluid to break apart shale and rock to release natural gas. Injection wells then dispose of the fluid by injecting it back into the ground.

There are 181 injection wells in the Oklahoma county where most of the weekend earthquakes happened, said Matt Skinner, spokesman for the Oklahoma Corporation Commission, which oversees oil and gas production in the state and intrastate transportation pipelines.

But natural gas companies claim there is no proof of a connection between injection wells and earthquakes, and a study released earlier this year by an Oklahoma Geological Survey seismologist seems to back that up. It found most of the state's seismic activity didn't appear to be tied to the wells, although more investigation was needed.


http://www.nydailynews.com/news/national/scientists-puzzled-seismic-activity-biggest-earthquake-oklahoma-history-article-1.973517


Offline IMADreamer

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #44 on: November 07, 2011, 10:32:21 AM »
You mean the giant energy companies deny their activity is causing destruction?  I'm shocked!  lol  I don't know if fracking is the cause, but it darn well needs some serious studying.
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Offline Downlinerz2

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #45 on: November 07, 2011, 10:59:00 AM »
You mean the giant energy companies deny their activity is causing destruction?  I'm shocked!  lol  I don't know if fracking is the cause, but it darn well needs some serious studying.
  Reminds me of this movie

Offline BigOkie

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #46 on: November 07, 2011, 09:52:22 PM »
Bunty, we just had a decent aftershock here about 8:45pm.  Enough that I was sitting on my den floor and it felt like those shaker rides at the fair!  You feel it?
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Offline W3DRM

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #47 on: November 07, 2011, 10:17:08 PM »
Bunty, we just had a decent aftershock here about 8:45pm.  Enough that I was sitting on my den floor and it felt like those shaker rides at the fair!  You feel it?

Looks like it was a 4.6 aftershock.


You'll probably feel them for several months with a few heavier ones interspersed with the smaller ones. Unless, of course, they are precursors to a larger one coming in the future. There is no way to know the answer to that thought though. Just enjoy the ride!!!  \:D/


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Offline Bunty

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #48 on: November 07, 2011, 10:18:04 PM »
Yes, I sure did.  Since a fairly strong thunderstorm was coming through at the time, I at first thought it was a sudden strong gust of wind.  But I heard my house rattle and figured that was no wind. I think it only lasted about 5 seconds. It was the first aftershock I felt since the 5.6 quake and the 3rd quake I've ever felt in my life.

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« Last Edit: November 07, 2011, 10:21:48 PM by Bunty »

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Offline SlowModem

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Re: 4.7 Earthquake Hits Oklahoma
« Reply #49 on: November 07, 2011, 10:21:51 PM »
I was just reading about this on another forum.  Whole lotta shakin' goin on!

Here's a list of recent activity there:

http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/US2/35.37.-98.-96_eqs.php
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