At about 2:14 a.m. we had an earthquake here in Tulsa, Oklahoma. Our house trembled for a few seconds twice. I went outside thinking maybe it was a storm and straight line winds but it was all quite outside. I was up working on the computer but the quake woke Mary who was sleeping. This is the first earthquake I've ever felt in my life. No damage. Local Fox News reports that was felt statewide but no reports yet of magnitude or epicenter. I'll keep posting updates here as they become available.

[UPDATE #1] Early reports estimate the earthquake was a magnitude 4.7. From the United States Geological Survey's (USGS) earthquake website:

[UPDATE #2] The epicenter is being reported about six miles north of Prague in southern Lincoln County (pretty much half-way between Oklahoma City and Tulsa). Also, there was a 3.4 magnitude aftershock at 2:27 a.m. from the same location along with a 2.7 magnitude quake at 2:44 a.m.

[UPDATE #3] Oklahoma had another earthquake tonight at 11:53 p.m. and it was much bigger this time measuring 5.6 magnitude on the Richter scale and it lasted even longer than this morning's.

Note, an earthquake that measures 5.0 on the Richter scale has a shaking amplitude 10 times larger and corresponds to an energy release of √1000 ≈ 31.6 times greater than one that measures 4.0. Accordingly, tonight's 5.6 earthquake was about 9 times more powerful than this morning's 4.7 earthquake!!!

[UPDATE #4] We made the Drudge Report headline:

Tonight's 5.6 earthquake is officially the strongest in Oklahoma's history surpassing the April 9, 1952, quake centered near El Reno, Oklahoma.

This quake was centered near the one(s) this morning, north of Prague, in Lincoln County, Oklahoma, near where Mary and I used to live when we were first married. According to the Lincoln County emergency manager, portions of U.S. 62 have buckled and the chimney on a two-story house collapsed near Prague.

The U.S. Geological Survey received reports that the tremors were felt in multiple states -- Kansas, Missouri, Arkansas, Texas and Tennessee among them. The agency has already received more than 12,000 reports, including from as far away as Indianapolis and Milwaukee.