Kenneth Luza, a geologist with the Norman-based geological survey, said the quake was centered near Lawton in Comanche County between Medicine Park and Richard's Spur.
The Oklahoman Geological Survey put a seismograph in the Meers Store in May, 1985. The seismograph records what is happening in the Meers Fault. The seismograph is able to feel movement in the Earth from far away. It is one of the best seismographs in the country. It has recorded earthquakes in the Indian Ocean, more than 10,300 miles away from Meers. The seismograph has recorded Russian nuclear tests, a natural gas explosion in Texas, and a mine accident in Michigan.
Joe Maranto has kept a seismograph in his historic Meers Store since 1985, when he started monitoring it for the Oklahoma Geological Survey.
Maranto's store is located several miles south of the Meers fault, but a scientist said the quake didn't necessarily stem from that fault-line. "It could be on the southeast end of the Meers fault, or it could be off on a smaller, related fault," said Jim Lawson, chief geophysicist at the Oklahoma Geological Survey Observatory at Leonard in Tulsa County. "We can say that over the past 10 years, there hasn't been a magnitude minus-1 on the Meers fault." Lawson said Tuesday's temblor is one of the eight largest ever known to occur in Oklahoma. The last large one occurred in Coal County on Sept. 6. That 4.4-magnitude quake was felt over a wide area, Lawson said. The largest occurred Oct. 22, 1882, possibly near Fort Gibson in northeastern Oklahoma.
"The Meers fault is a crack in the earth's crust. The 15-mile-long fault can be seen from the air. This fault is special. It is the only fault that breaks the surface of the Earth east of the Rocky Mountains. The fault is a part of the Wichita Mountains, the oldest mountains in North America. Once they were higher than the Rocky Mountains. But as the wind blew and the rain fell for millions of years, they were worn down. On April 20, 1997, the first earthquake ever felt in Oklahoma was recorded. It had a magnitude of 2. The center of the quake was two miles west of the old Pine Ridge community. The quake was close enough to Meers to break the pen on the seismograph."
So, it seems that if this fault can feel earth movement at least 10,300 miles away from the epicenter, it is possible the 4.1 quake was a result of the 8.8 Chile quake.