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The Nemaha Ridge (also called the Nemaha Uplift and the Nemaha Anticline) is located in the Central United States. It is a buried structural zone associated with a granite high in the Pre-Cambrian basement that extends from approximately Omaha, Nebraska to Oklahoma City, Oklahoma..
The Wilzetta fault is part of a belt of ancient, buried thrust faults that runs through central Oklahoma and north into Kansas (this pdf is the best resource I found). This thrust belt was first active in the Carboniferous period, 350-300 million years ago, in the later stages of the continental collision that formed the Appalachians. Even when the tectonic forces that created them have long dissipated, faults are still weak points in the crust; and even far from an active plate boundary, the motion of tectonic plates across the mantle can generate stress. If that stress is aligned in the right direction, the scars of ancient orogenies such as the Wilzetta fault can still respond to them, generating earthquakes large enough to cause some damage.