Nemaha Ridge

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Structures of Kansa showing the Nemaha Uplift/ridge

The Nemaha Ridge 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 ridge is associated with the seismically active Humboldt Fault zone. The ridge is associated with the Proterozoic Midcontinent Rift System which extends into northern Kansas about fifty miles west of the Nemaha Ridge.[1] The long term uplift along the ridge has been attributed to isostatic uplift due to the anomalously thick crust adjacent to the Midcontinent Rift.[2]

References

  1. ↑ Public Information Circular (PIC) 3, Kansas Geological Survey
  2. ↑ Gao, Stephen S., et al., Old Rifts Never Die: Crustal Thickening Across the Midcontinent Rift and Its Possible Role in Post-Rifting Tectonics, Structure and Tectonics of the Midcontinent, North America, GSA 2002 Denver Annual Meeting

Earthquake history in Custer County, Greeley County, Howard County, Valley County, Nebraska USA 1867-2012

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