Deformation along the central Reelfoot scarp and Lake County uplift, northwestern Tennessee
Conference
·
· Geological Society of America, Abstracts with Programs; (United States)
OSTI ID:7069787
- Univ. of Arkansas, Fayetteville, AR (United States). Geology Dept.
- William Lettis Associates, Oakland, CA (United States)
A 90-m trench across the Reelfoot scarp provided data to assess deformation along the east flank of the Lake County uplift. Marker beds within natural levee deposits define a monocline that parallels the ground surface with more than 5 m of down-to-the-east vertical separation. This fold contains four 1 m amplitude flexures each having numerous west-dipping normal faults. The faults have a total net vertical separation of about 0.4 m in a down-to-the-west sense, which is opposite to that exhibited by the scarp and the marker beds. The authors believe these faults are related to extension in the crest of the monocline, and that the monocline represents deformation above a west-dipping reverse fault that reaches or approaches the ground surface east of the base of the scarp. The trench data also reveal at least two episodes of deformation: one in A.D. 1811--12, and one between A.D. 1,310 [+-] 90 and A.D. 1,540 [+-] 90. Thus, the time between the two most-recent earthquakes large enough to produce liquefaction and/or surface deformation was about 200 to 600 years. Holocene deformation associated with the scarp and the Lake County uplift is revealed in mapped meander patterns of the Mississippi River. Meander domains indicate that Holocene deformation of the Lake County uplift forced a northwesterly migration of the river, and that anticlinal growth progressed from southeast to northwest.
- OSTI ID:
- 7069787
- Report Number(s):
- CONF-9303210--
- Conference Information:
- Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:3
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:6693244