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Whole lot of shakin' going on in Oklahoma.

by I.M.Retired
17 replies
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BBC News - Oklahoma shaken by 5.6 magnitude earthquake

The US state of Oklahoma has been shaken by a 5.6 magnitude earthquake, thought to be the strongest in its history.

Some buildings cracked and a highway buckled, but there were no immediate reports of serious injury or damage.

The quake was centred near the town of Sparks, some 44 miles (71km) north-east of Oklahoma City, at a depth of 3.1 miles (5km).
The world is on the move, it seems.
  • Profile picture of the author TopKat22
    Yep. A while back it was Colorado.

    I've been reading some of my facebook friends in Kansas saying they felt the quake all the way up there.
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  • Profile picture of the author ScottyM2
    Unsure what the origin of the earthquakes are?????????????

    Eight quakes reported in 24 hours in Oklahoma | NewsOK.com
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  • Profile picture of the author HeySal
    Oklahoma has a LOT of quakes. That's the first 5 mag though - at least the largest there so far. It was only 5 km deep, so I imagine it was pretty darned alarming.

    Because it's not on a plate boundary, fractures and faults can be hard to find because they are usually underneath where they aren't apparent.
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  • Profile picture of the author 1119king
    I live in Oklahoma, and it was actually pretty cool. A 5.6, at least from where I was, barely did any damage. The whole house vibrated and I got all excited because I'd never felt an earthquake before. I guess it's something for me to remember.
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  • Profile picture of the author Dave Patterson
    I travel I-55 and I-57 a lot and I've been getting a weird feeling passing thru the New Madrid area the last several months or so...

    With all the shaking going on, on both sides of that faultline, I got a feeling that babies going to cut loose in a big way....soon!
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    • Profile picture of the author Kurt
      Originally Posted by Dave Patterson View Post

      I travel I-55 and I-57 a lot and I've been getting a weird feeling passing thru the New Madrid area the last several months or so...

      With all the shaking going on, on both sides of that faultline, I got a feeling that babies going to cut loose in a big way....soon!
      Let's hope not...That will be unbelievably tragic.
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  • Profile picture of the author HeySal
    Yeah it would be. Another 8. whatever it was a hundred years ago and 5 states at the least will be effected. That last major one was so strong it made the Mississippi flow backwards. There wasn't much population in the way of it back then. Can't say the same now.

    Unfortunately, scientists also expect it to let go again real soon. I already posted the simulated effects they ran and what they got for figures on it -- but from 7.2 up til 7.6 mag it was incrementally larger 1 - 10% death rate....and they stopped there. Unfortunately, a major quake in that area won't. That fault has put out one of the highest mag quakes I've ever seen listed in a non plate convergent zone.
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    • Profile picture of the author Kurt
      Originally Posted by HeySal View Post

      Yeah it would be. Another 8. whatever it was a hundred years ago and 5 states at the least will be effected. That last major one was so strong it made the Mississippi flow backwards. There wasn't much population in the way of it back then. Can't say the same now.

      Unfortunately, scientists also expect it to let go again real soon. I already posted the simulated effects they ran and what they got for figures on it -- but from 7.2 up til 7.6 mag it was incrementally larger 1 - 10% death rate....and they stopped there. Unfortunately, a major quake in that area won't. That fault has put out one of the highest mag quakes I've ever seen listed in a non plate convergent zone.
      Actually I think it was 200 years ago. A lot of people dont' realize that earthquake was the most powerful in US recorded history. The only reason we don't hear more about it is because no one lived there at time.

      Now, 10s of millions of people could be affected, especially Memphis.

      Not only did the Mississippi run backwards for a while, it was redirected causing a strange geographical anomoly. By redirecting the Mississippi, it left a small "island" of Kentucky completly surrounded by Missouri.

      Check out the little dot at the very bottom/left of the map that's seperate from the rest of the state of KY...That "dot" was caused by the New Madrid earthquake and used to be connected to KY:

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  • Profile picture of the author Alexa Smith
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    Originally Posted by Val.S. View Post

    Whole lot of shakin' going on in Oklahoma.
    I blame that Bill Platt, myself.

    It's the gradual accumulation of reverberation from the constant vibration of all his harmonica trainings.

    That had to cause some damage, eventually.
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  • Profile picture of the author Patrician
    oooh scary. i hope it stops and everyone can just move on

    umm (no pun intended).

    calif is having 'earth shaking' weather (another pun no intend)
    pretty hot, rain, freezing cold, pretty hot sun, sunny and mild, cold and calm (all in 24 hours) i don't like it when it goes hot cold hot cold too much. it's too shocking -

    ... and they say we don't have seasons here...


    i put my extra leather coat in my car emergency kit today. laptop is in the case plugged into the adapter 4 now with all clothes and valuables close to the front door. stashed more water car and home.
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  • Profile picture of the author JustinDupre
    Read about this on the news. Hope everyone is doing fine over there.
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  • Profile picture of the author HeySal
    Kurt - the Cascadia blew harder than that in 1710. Madrid is the largest Non-plate boundary quake. If Cascadia blows another 9 mag quake again (also expected soon), it will dwarf the Madrid. Not sure, but I think that Madrid has produced the largest non-plate boundary quakes in the world. Close if not the first largest.
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    • Profile picture of the author ThomM
      Well I just looked it up because I thought the New Madrid was the largest.
      Seems the Cascadia one Sal mentioned was the largest and the N.M. came in at number 5. That is for the lower 48. If you add in Alaska and Hawaii then Cascadia is number 2 and N.M. is 18.
      Largest Earthquakes in the United States

      The thing about the N.M. quake is it was the largest east of the Rockies.
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      • Profile picture of the author Kurt
        Originally Posted by ThomM View Post

        Well I just looked it up because I thought the New Madrid was the largest.
        Seems the Cascadia one Sal mentioned was the largest and the N.M. came in at number 5. That is for the lower 48. If you add in Alaska and Hawaii then Cascadia is number 2 and N.M. is 18.
        Largest Earthquakes in the United States

        The thing about the N.M. quake is it was the largest east of the Rockies.
        A couple of interesting things on this page...First is, they list 3 quakes in about a year for New Madrid:
        5.New Madrid, Missouri1811 12 16 08:15 UTC7.7
        6.New Madrid, Missouri1812 02 07 09:45 UTC7.7
        7.New Madrid, Missouri1812 01 23 15:00 UTC7.5

        Then the page goes on to say:

        Note: Widely differing magnitudes have been computed for some of these earthquakes; the values differ according to the methods and data used. For example, some sources list the magnitude of the 8.7 Rat Islands earthquake as low as 7.7. On the other hand, some sources list the magnitude of the February 7, 1812 New Madrid quake as high as 8.8. Similar variations exist for most events on this list, although generally not so large as for the examples given.

        In general, the magnitudes given in the list above have been determined from the seismic moment, when available. For very large earthquakes, the moment magnitude is considered to be a more accurate determination than the traditional amplitude magnitude computation procedures. Note that all of these values can be called "magnitudes on the Richter scale," regardless of the method used to compute them.
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        • Profile picture of the author ThomM
          I noticed that to Kurt.
          But notice on the N.M. ones they happened in a less then two month span from Dec. 16 to Fed 7.

          The very first thought I had on the Cascadia one in 1700 was 'how do they know?'. In fact I had that thought on most of them that happened before they had the equipment to measure them.
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          • Profile picture of the author Patrician
            Originally Posted by ThomM View Post

            . In fact I had that thought on most of them that happened before they had the equipment to measure them.
            gOOD pOINT, yO.

            Duh-Vinchy?

            OK let's hear it - how did they used to do it?

            those are some very scary stats - whoa!
            it seems almost ludicrous to think our little survival kits would be applicable 'N/A'

            (issue to me being it's getting really creepy and it aint just in california no mo, Yo.)


            P>S> I am somebody who has been through a 6.9 MAG (i think in the SF 1989 quake)

            So I have a pretty good idea both in my space (top story (6) of an 80 year old building on a hill - did fine - just bent the elevator (foundation was retrofitted by law recent to that) lower nob hill is BEDROCK.

            what imploded, burned and crumbled was the marina district built on LANDFILL.

            (oh and 1 of 2 main bridges broke with people on it) The most action in the quake was under water - i forget whether Sal would say it was deep or shallow. but at the time that was the theory about WHY)

            But anyway - I CAN JUST IMAGINE 7 OR 8 MAG maybe a little more easily than others.

            Missouri and every place else besides California sure did keep the Earthquake PR LOW KEY.

            all of a sudden earthquakes are coming to a town near you too!

            who knew?
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  • Profile picture of the author HeySal
    They have ways of measuring, Thom. If you actually do study on the Madrid, the consensus seems to be around 8. something.

    The Cascadia caused a Tsunami that hit Japan pretty hard. If one went off like that today, it would be a repeat of what we saw some months back and very possibly worse.

    I haven't really put alot of study into historic quakes except I run across the info here and there when looking up info on specific areas. Don't know what that one was in Alaska - might look it up.
    The biggest ever was 9.5 (that we know of) and I can't remember where the heck that was. You folks know where that one was?
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