Remember New Madrid! (not too far from OK)

From Rockhound:

Large areas of land were uplifted while much land sank, draining existing lakes and creating others, such as Reelfoot Lake in northwest Tennessee. Sand blows erupted like geysers, spreading sand over large areas where it is still visible today, after many years of cultivation. These eruptions of sand and water were called sand volcanoes by observers.

The damage area for the 16 December 1811 New Madrid earthquake was 15 times as large as the area of similar damage for the magnitude 8.3 San Francisco earthquake of 1906. And the third of these great earthquakes, in February of 1812, is the largest known earthquake in the continental U.S. Only Alaska has had a larger one, the Great Alaska earthquake of 1964.