Nemaha Ridge

  (Redirected from Nemaha Fault)

The Nemaha Ridge (also called the Nemaha Uplift and the Nemaha Anticline[1]) 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. It is also associated with the Proterozoic Midcontinent Rift System, which extends into northern Kansas about fifty miles west of the Nemaha.[2]

Structures of Kansas showing the Nemaha Uplift/Ridge

Along the Nemaha Ridge is a series of faults referred to as the "Nemaha Fault Zone".[2][3] The long term uplift along the ridge has been attributed to isostatic uplift due to the anomalously thick crust adjacent to the Midcontinent Rift.[4]

ReferencesEdit

  1. ^ Daniel F. Merriam (1963). The Geologic History of Kansas, Kansas Geological Survey, Bulletin 162. University of Kansas Publications, State Geological Survey of Kansas. The Nemaha Anticline, probably the most famous of all Kansas structures, ... crosses Kansas from Nemaha County on the north to Sumner County on the south and extends into Nebraska and Oklahoma.
  2. ^ a b Kansas Geological Survey, Current Research in Earth Sciences, Bulletin 250, part 1 "Review of the Nemaha Ridge: A New Look at an Old Structure"
  3. ^ "Nemaha Strike-Slip Fault Expression on 3-D Seismic Data in SCOOP Trend". AAPG EXPLORER. 2018-06-01. Retrieved 2018-07-25.
  4. ^ 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