SPARKS, Okla. – Clouds of dust belched from the corners of almost every room in Joe Reneau's house as the biggest earthquake in Oklahoma history rocked the two-story building.
A roar that sounded like a jumbo jet filled the air, and Reneau's red-brick chimney collapsed and fell into the roof above the living room. By the time the shaking stopped, a pantry worth of food had been strewn across the kitchen and shards of glass and pottery covered the floor.
"It was like WHAM!" said Reneau, 75, gesturing with swipes of his arms. "I thought in my mind the house would stand, but then again, maybe not."
The magnitude 5.6 earthquake and its aftershocks still had residents rattled Sunday.
Two minor injuries were reported from Saturday's quakes by the Oklahoma Department of Emergency Management, which said neither person was hospitalized. And, aside from a buckled highway and the collapse of a tower on the St. Gregory's University administration building in Shawnee, no major damage was reported.
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.
Saturday night's big one jolted Oklahoma State University's stadium shortly after the No. 3 Cowboys defeated No. 17 Kansas State. Fans were still leaving the game.
"That shook up the place, had a lot of people nervous," Oklahoma State wide receiver Justin Blackmon said.
The temblor sent Jesse Richards' wife running outside because she thought their home was going to collapse. The earthquake centered near their home in Sparks, 44 miles northeast of Oklahoma City, could be felt throughout the state and in Arkansas, Kansas, Missouri, northern Texas and some parts of Illinois and Wisconsin.
Richards estimated it lasted for as much as a minute. One of his wife's cookie jars fell on the floor and shattered, and pictures hanging in their living room were knocked askew.
"We've been here 18 years, and it's getting to be a regular occurrence," said Richards, 50. But, he added, "I hope I never get used to them."
Geologists now believe a magnitude 4.7 earthquake Saturday morning was a foreshock to the bigger one that followed that night. They recorded at least 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."
Brad Collins, the spokesman for St. Gregory's University in Shawnee, said one of the four towers on its "castle-looking" administration building collapsed in the big earthquake and the other three towers were damaged. He estimated the towers were about 25 feet tall.
"We definitely felt it," Collins said. "I was at home, getting ready for bed and it felt like the house was going to collapse. I tried to get back to my kids' room and it was tough to keep my balance, I could hardly walk."
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.
"It's a real mystery," seismologist Austin Holland of the Oklahoma Geological Survey said of the recent shaking.
"At this point, there's no reason to think that the earthquakes would be caused by anything other than natural" shifts in the Earth's crust, Holland said.
Earle said he couldn't comment on the relationship between fracking, injection wells and earthquakes.
Most Oklahoma residents still see earthquakes as anomalies in a state more often damaged by tornadoes. Roger Baker, 52, laughed at the idea of buying earthquake insurance, although the weekend quakes left a 6-foot-long crack several inches deep his yard in Sparks.
"It's just a part of life," he said.
Prague resident Mark Treat, 52, was at the Dollar General store Sunday, buying paper towels in bulk, garbage bins and a broom and mop to begin cleaning up his home. He said the quake hit hard enough to knock dishes, lamps and a TV to the ground and overturn a chest of drawers.
"It busted up a lot of stuff," Treat said. "I can't believe is only was a 5.6."
Associated Press writer Ken Miller in Oklahoma City and AP science writer Alicia Chang in Los Angeles contributed to this report.
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