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Old 11-23-2011   #19
EmperorChaos
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Re: Earthquake jolts Oklahoma

I found this map interesting:



It shows the major earthquake hazard areas within the US. Note that Oklahoma is rated in the 16-32% risk range for a "major" earthquake. Major Earthquakes are considered to be between 7.0-7.9 Magnitude, Strong Earthquakes are 6-6.9 Magnitude, and Moderate Earthquakes are 5-5.9 Magnitude. Thus, Oklahoma has had one Moderate Earthquake and the rest have been Minor. Great Quakes, of which you may expect generally one per year, are 8.0 Magnitude and above.


Jenn, as this was an intraplate earthquake like the Charleston Quake of 1886 and the Mineral, VA earthquake earlier this year, you can expect mostly all future noticeable tremors in the area to be aftershocks of this one.
Enjoy :)
(Most of the quakes detected by instruments will be imperceptible to human senses but rest assured that every now and again a 3.0+ guy will pop up to remind you of his 5.6 father.)


Intraplate quakes are quite fascinating because so little is known about them. I have wondered if intraplate earthquakes occur in clusters. In the last two years, the Eastern half of the North American continent has experienced several sizeable intraplate earthquakes from Quebec, Canada, to Mineral, Virginia, and now in Oklahoma. From the data I looked at, this is in contrast to the devastating intraplate earthquakes of the 19th century in New Madrid, Missouri in the winter of 1811/1812 and Charleston, South Carolina of 1886.
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