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General Weather/Earth Sciences Topics => Earth Sciences => Topic started by: Bunty on November 05, 2011, 05:53:14 AM
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I definitely experienced my first earthquake this morning, 11/5/2011. It was strange as it happened. There was a slight and gentle shake but quite noticeable was groaning sounds of wood coming from the walls of my home. It lasted for not quite 10 seconds. Some people, like myself, initially thought it was a sudden gust of wind. It's been reported as felt in neighboring states. There has been some after shocks. This earthquake may be tied for the second strongest ever in Oklahoma history. The strongest one was 5.5 in 1952.
http://stillwaterweather.com/okareaearthquakes.php (http://stillwaterweather.com/okareaearthquakes.php)
From the ok geo survey: http://www.okgeosurvey1.gov/
Preliminary Earthquake Report, November 5, 2011
Contacts: Austin Holland or Amie Gibson, Oklahoma Geological Survey, (Email Us)
On November 5, 2011 at 2:12 AM CDT (07:12:45.4 UTC) an earthquake occurred in Lincoln County, Oklahoma. The earthquake occurred about 6 miles northwest of Prague and 5.2 miles southeast of Sparks. The OGS determined a ML magnitude of 4.8 and the USGS currently has it at a magnitude 4.7 (Mb) these two numbers are essentially the same given the errors in calculating magnitude. Both the USGS and the OGS have determined a magnitude 5.2 mbLg for this event. This earthquake occurred very close to where a magnitude 4.3 earthquake occurred on February 27, 2010. From the location of the earthquake and the focal mechanism it is most likely that this earthquake occurred on the Wilzetta fault also known as the Seminole uplift. As of 3:30 AM CDT on 11/5/11 the OGS has received a few hundred reports.
We will be updating this page as we get more information so please check back.
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It's definitely an attention getter that you won't forget! Whether it's your first or have been through several. Your 'groaning sounds" description reminded me of a trip to the Philippines and the hotel I stayed in. It was a big hotel of cement construction and while I was sitting down in the lobby I heard that 'groaning' noise above me as if something heavy up on the next floor was being moved across the room. At the time I didn't think much about it but soon realized that the cement construction shouldn't make this sound. Found out a little later of a quake that occurred. 1st one for me also, then.
Hope yours didn't do any structural damage to your property.
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Cool. Must have been a real eye-opener! I am wondering why I did not get an email from the USGS about it. I have a subscription with them and I have been getting them regularly but not for this one. I will have to check my subscription. Glad you didin't suffer any injuries!
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4.8 is nothing to sneeze at, especially for an area that does not get many quakes!
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I see Oklahoma had another quake this evening - this one was a 5.6 that occurred at 03:53 UC 11/6/2011 (which is 10:53pm 11/5/2011 in OK).
- http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usb0006klz.php (http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usb0006klz.php)
I can remember quakes in the San Francisco area that kept building up prior the 1989 Loma Prieta quake (a 7.1 magnitude event) and then a lot of quakes in the 6 and 5 range for months afterwards. It wasn't a pleasant experience for sure - but I survived it with minimal damage to my home in San Jose. What I am suggesting is that, looking back at that quake, we saw an ever increasing number and size of quakes over the years leading up to that event. They build slowly and quietly before they release a larger and more damaging quake. Not to scare anyone in the area, just something to keep in mind and be watchful. Have your emergency supplies ready.
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I see Oklahoma had another quake this evening - this one was a 5.6 that occurred at 03:53 UC 11/6/2011 (which is 10:53pm 11/5/2011 in OK).
- http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usb0006klz.php (http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usb0006klz.php)
I can remember quakes in the San Francisco area that kept building up prior the 1989 Loma Prieta quake (a 7.1 magnitude event) and then a lot of quakes in the 6 and 5 range for months afterwards. It wasn't a pleasant experience for sure - but I survived it with minimal damage to my home in San Jose. What I am suggesting is that, looking back at that quake, we saw an ever increasing number and size of quakes over the years leading up to that event. They build slowly and quietly before they release a larger and more damaging quake. Not to scare anyone in the area, just something to keep in mind and be watchful. Have your emergency supplies ready.
Felt that one tonight...started off shaking my computer monitor about and sounded a little like a jet. I got up to go into the living room and some stuff fell off cabinets in there. Most definitely the strongest one I've ever felt. Lasted about 45 seconds.
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After not feeling any since the first one, a strong aftershock happened here as of 10:53PM, 11/5/11. This time it felt somewhat stronger and came with a rumbling, kinda like thunder in the distance. I thought it registered higher than the original. I was right. It was initially placed at 5.2 but has just been revised to 5.6. It probably lasted around 10 seconds. If it holds, then it will be the strongest earthquake in Oklahoma history. I'm around 40 or 50 miles from the center. Some people living near the center have had things falling off shelves. I'm glad it hasn't gotten that bad at my house.
Interesting how the quake happened shortly after No. 3 OSU barely beat Kansas State in football, 52 to 45 here in Stillwater. It was quite a game down to the final seconds.
http://www.stwnewspress.com/local/x459216859/BREAKING-Second-earthquake-in-less-than-24-hours-shakes-Stillwater (http://www.stwnewspress.com/local/x459216859/BREAKING-Second-earthquake-in-less-than-24-hours-shakes-Stillwater)
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The regional moment tensor solution indicates that this and the previous one earlier today had a strike slip movement,
http://earthquake.usgs.gov/earthquakes/eqarchives/fm/neic_b0006klz_rmt.php
I think that may explain why the quake is being felt so far to the NE of its epicenter.
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I see Oklahoma had another quake this evening - this one was a 5.6 that occurred at 03:53 UC 11/6/2011 (which is 10:53pm 11/5/2011 in OK).
- http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usb0006klz.php (http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usb0006klz.php)
I can remember quakes in the San Francisco area that kept building up prior the 1989 Loma Prieta quake (a 7.1 magnitude event) and then a lot of quakes in the 6 and 5 range for months afterwards. It wasn't a pleasant experience for sure - but I survived it with minimal damage to my home in San Jose. What I am suggesting is that, looking back at that quake, we saw an ever increasing number and size of quakes over the years leading up to that event. They build slowly and quietly before they release a larger and more damaging quake. Not to scare anyone in the area, just something to keep in mind and be watchful. Have your emergency supplies ready.
I appreciate the input from an old pro like yourself. I realize I'm in Illinois and these quakes are in OK, but we've been feeling them too. Also the New Madrid fault is a concern here for us. We have a kit together for tornadoes so I assume the same one will work for earthquakes. We just had a Dreamer family meeting here a few minutes ago to discuss what to do in an earthquake because I'm pretty sure our response of looking at each other and saying "what the heck was that?" simultaneous is not the thing to do. lol I think when I get to work Monday I will go over some earthquake preparedness with my employees though just so we are all on the same page.
As I've said many times, I don't like earthquakes! Tornadoes, snow storms, derechos, hurricanes, etc I can prepare for those, I know they are coming, I can get out of their harms way, but if the big one hits while I'm in bed...... well that scares the crap out of me.
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Felt that one tonight...started off shaking my computer monitor about and sounded a little like a jet. I got up to go into the living room and some stuff fell off cabinets in there. Most definitely the strongest one I've ever felt. Lasted about 45 seconds.
On KWTV-9 in Oklahoma City during late news they just showed a video clip showing downtown skyscrapers shaking in Tulsa. I'm glad it didn't last as long as 45 seconds at my place. I get some consolation that these quakes aren't centered, so far, under the biggest cities in Oklahoma, and that no fault line runs through the county I live in.
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I get some consolation that these quakes aren't centered, so far, under the biggest cities in Oklahoma, and that no fault line runs through the county I live in.
Those can be famous last words. Most faults are unmapped.
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LOL, watch this sports reporter's eyes bug out while at Pickens Stadium in Stillwater.
http://www.youtube.com/watch?v=szrNAepH-4g&feature=player_embedded (http://www.youtube.com/watch?v=szrNAepH-4g&feature=player_embedded)
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lol very wide eyed, but he held it together well.
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I get some consolation that these quakes aren't centered, so far, under the biggest cities in Oklahoma, and that no fault line runs through the county I live in.
Those can be famous last words. Most faults are unmapped.
Most of the mapped faults and uplifts in Oklahoma are in the center and southern part of the state. The one this happened on was in the center of the state. Here's the best map I could find of the faults:
(http://www.okgeosurvey1.gov/level2/geology/ok.geo.provinces.large.gif)
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Felt that one tonight...started off shaking my computer monitor about and sounded a little like a jet. I got up to go into the living room and some stuff fell off cabinets in there. Most definitely the strongest one I've ever felt. Lasted about 45 seconds.
On KWTV-9 in Oklahoma City during late news they just showed a video clip showing downtown skyscrapers shaking in Tulsa. I'm glad it didn't last as long as 45 seconds at my place. I get some consolation that these quakes aren't centered, so far, under the biggest cities in Oklahoma, and that no fault line runs through the county I live in.
Likely from KOTV-6 (that's KWTV's sister station) Williams Tower cams and others. It was pretty intense. About 15 seconds of decent shaking, followed by five seconds of nothing, then 25 seconds or so of the shaking that knocked the stuff off my cabinets. Everyone in the neighborhood was out on their porch pretty quickly.
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Thanks Big Okie for providing that map. I had already seen it and was about to put it up. That's were I got some consolation that no fault lines run through my county, or known ones.
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Your state seismologist says the quakes are due to movement along the Seminole Uplift structure: http://newsok.com/earthquake-multiple-aftershocks-rattle-central-oklahoma/article/3620572
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Thanks for the article. Here's is another video. It's an OSU fan who felt the earthquake in Henryetta. It didn't seem that intense at my place.
http://www.youtube.com/watch?v=AVXjK0jMeWY&feature=player_embedded (http://www.youtube.com/watch?v=AVXjK0jMeWY&feature=player_embedded)
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My best estimate of the quake's location plotted on that OK structural map.
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Interesting radar from OUN. You'll need to wait about 10 seconds for the image to change to the post earthquake one.
(http://stillwaterweather.com/photos/ouneq.gif)
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This guy was recording a video blog about OSU's win over Kansas State when it hit. His reaction is pretty funny:
http://www.youtube.com/watch?feature=player_embedded&v=AVXjK0jMeWY
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Thanks for the article. Here's is another video. It's an OSU fan who felt the earthquake in Henryetta. It didn't seem that intense at my place.
http://www.youtube.com/watch?v=AVXjK0jMeWY&feature=player_embedded (http://www.youtube.com/watch?v=AVXjK0jMeWY&feature=player_embedded)
His little bobble head doll on the stereo shelf behind him was getting into it! :lol:
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5.6 aftershock?! Was there any structural damage? Thats a strong one! This is about as crazy as the East Coast one!
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We live 100 miles south of the activity. Have not felt any of the quakes! My earthquake page is beginning to look more like California than Oklahoma.
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We live 100 miles south of the activity. Have not felt any of the quakes! My earthquake page is beginning to look more like California than Oklahoma. Oklahoma Earthquake Activity (http://www.ardmoreweatherlive.com/earthquake.php)
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?
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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.
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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.
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
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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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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
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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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CNN is saying something like 30 aftershocks so far.
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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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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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I have heard in the past of quakes where there were larger after-shocks than the primary.
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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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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
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Hope the activity does not spread up to the Yellowstone system. 8-[ [-o< ;)
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Hope the activity does not spread up to the Yellowstone system. 8-[ [-o< ;)
...and cause a super-volcano BOOM!
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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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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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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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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:
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/
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Cracks in a road near the epicenter: http://www.reddirtreport.com/Story.aspx/20300
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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
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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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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
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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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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.
- http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/US10/32.42.-100.-90_eqs.php (http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/US10/32.42.-100.-90_eqs.php)
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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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.
Traffic to my site has sure been up like crazy since Saturday.
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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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Only in Oklahoma can you be living with a tornado watch, a severe thunderstorm warning and have an earthquake happen at the same time.
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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
:shock: that's amazing. The same place and so often.
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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
:shock: that's amazing. The same place and so often.
I wonder if there's something going on there? :-k
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I swear I felt another one in the middle of the night last night. Not sure what time but I woke up and things were shaking. It was kind of like a slow shake and it lasted for a good 30 seconds I'll bet. However there weren't really any bigger ones in the middle of the night which makes me wonder if I was dreaming.
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Come on, you guys know. Isnt that the main base of the 239th Strategic Earthquake Weapons Division? :lol:
Andrew
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
:shock: that's amazing. The same place and so often.
I wonder if there's something going on there? :-k
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I swear I felt another one in the middle of the night last night. Not sure what time but I woke up and things were shaking. It was kind of like a slow shake and it lasted for a good 30 seconds I'll bet. However there weren't really any bigger ones in the middle of the night which makes me wonder if I was dreaming.
I don't know about overnight, but it looks like there was one today:
3.6 2011/11/08 19:05:17 35.535 -96.797 5.1 9 km ( 5 mi) SSE of Sparks, OK
19:05Z - 6 hours makes it 13:05CST
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Seems like things are still shaking out there.
Story here (http://www.wdef.com/news/national/story/Another-earthquake-rocks-Oklahoma/VOee3Rx8qUi87sfYmxbKdA.cspx).
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They are still staying too weak to be felt here. I don't mind. I felt the three biggest ones, though, that happened earlier in the month(Nov.), the foreshock, the biggest one and the strongest aftershock that came during a thunderstorm. When the aftershock first came, I at first instantly thought it was the wind suddenly coming up from the storm until I heard the french doors to my living room rattle. These earthquakes have been going on for around two years.
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Here's a story about a giant sinkhole (http://www.kfor.com/news/local/kfor-massive-sinkhole-appears-overnight-20111129,0,2753754.story) that just formed in the area.
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Oklahoma had a 4.0 earthquake Tues. morning. This time it happened in a different part of the state.
http://stillwaterweather.com/okareaearthquakes.php (http://stillwaterweather.com/okareaearthquakes.php)
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I think an earthquake would be the scariest kind of weather phenomenon because there is no way to get away from it...We've had a couple 1pt and 2pt earthquakes but thankfully nothing major 8-)
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For me a tornado warning is always more worrisome and stressful. The earthquakes in my town, so far, haven't caused destruction. But tornadoes certainly have before. Two of them since 1975. Interesting that my mother at age 92 felt her first earthquake.