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The magnitude 5.6 earthquake and its aftershocks still had residents rattled Sunday. No injuries were reported, and aside from a buckled highway and the collapse of a tower on the St. Gregory's University administration building, neither was any major damage. But the weekend earthquakes were among the strongest yet in a state that has seen a dramatic, unexplained increase in seismic activity. 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. Still, most of the earthquakes have been small.
Scientists say they have no explanation for the quakes. They happened along an ancient fault, although it's not clear yet whether shifting along the fault is what caused them, Earle said. One reason earthquakes are hard to predict in Oklahoma is that the state sits over a series of smaller ancient faults, rather than a major fault, such as California's San Andreas Fault, he said. 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. The state survey didn't respond to phone messages left Sunday. Earle said he couldn't comment on the relationship between fracking, injection wells and earthquakes.
Geologists now believe a magnitude 4.7 earthquake Saturday morning was a foreshock to the bigger one that followed that night. They recorded 10 aftershocks by midmorning Sunday and expected more. Two of the aftershocks, at 4 a.m. and 9 a.m., were big, magnitude 4.0. "We will definitely continue to see aftershocks, as we've already seen aftershocks from this one," said Paul Earle, a seismologist with the U.S. Geological Survey in Golden, Colo. "We will see aftershocks in the days and weeks to come, possibly even months."
Hydraulic fracturing is the propagation of fractures in a rock layer caused by the presence of a pressurized fluid. Hydraulic fractures may form naturally, as in the case of veins or dikes, or may be man-made in order to release petroleum, natural gas, coal seam gas, or other substances for extraction, where the technique is often called fracking[a] or hydrofracing.[1] This type of fracturing, known colloquially as a frack job (or frac job),[2][3] is done from a wellbore drilled into reservoir rock formations. The energy from the injection of a highly pressurized fluid, such as water, creates new channels in the rock which can increase the extraction rates and ultimate recovery of fossil fuels. The fracture width is typically maintained after the injection by introducing a proppant into the injected fluid. Proppant is a material, such as grains of sand, ceramic, or other particulates, that prevent the fractures from closing when the injection is stopped. The practice of hydraulic fracturing has come under scrutiny internationally due to concerns about environmental and health safety, and has been suspended or banned in some countries
I have one last think I would like to ask. Has anyone else had a feeling of veritigo or sea sea sickness prior to or during these quakes, even if you live hundreds of miles away? I felt that twice during earthquakes that happenend in other states.
Originally posted by Unity_99
Fracking could be a cause.
www.care2.com...
Fracking May Have Caused 50 Earthquakes in Oklahoma
Originally posted by Veritas1
(snip)
I have one last thing I would like to ask. Has anyone else had a feeling of veritigo or sea sea sickness prior to or during these quakes, even if you live hundreds of miles away? I felt that twice during earthquakes that happenend in other states.
Originally posted by Unity_99
Fracking could be a cause.
www.care2.com...
Fracking May Have Caused 50 Earthquakes in Oklahoma
Increase in Oklahoma seismic activity puzzles scientists
Originally posted by Copperflower
Here is the Oklahoma Geological Survey report on seismic activity since January, and the correlation they make between fracking and these seismic events.
www.ogs.ou.edu...
Originally posted by dreams n chains
Originally posted by Veritas1
(snip)
I have one last thing I would like to ask. Has anyone else had a feeling of veritigo or sea sea sickness prior to or during these quakes, even if you live hundreds of miles away? I felt that twice during earthquakes that happenend in other states.
Spot on. I had vertigo half the day before the earthquake hit in Virginia this year. Yet I live in north Florida. I could not figure out as to why. I even mentioned to my roommate that I wondered if there was something going on with the earth because I felt like I was on a ship. We learned shortly there-after about the earthquake in Virginia.
I've learned to pay more heed now.edit on 11/6/2011 by dreams n chains because: to fix quote