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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?
5.6 aftershock?! Was there any structural damage? Thats a strong one! This is about as crazy as the East Coast one!
Oklahoma's Strongest Earthquake Causes DamageThe 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.
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 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
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.
Hope the activity does not spread up to the Yellowstone system.
Quote from: IMADreamer on November 06, 2011, 02:24:26 PMThis 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.
Preliminary Earthquake Report, November 5, 2011On 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.
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.
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.
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?