Geophysical and Geological Evidence of Neotectonic Deformation along the Hovey Lake Fault, Lower Wabash Valley Fault System, Central United States

2005 ◽  
Vol 95 (3) ◽  
pp. 1193-1201 ◽  
Author(s):  
E. W. Woolery
Keyword(s):  
United States ◽  
Fault System ◽  
Geological Evidence ◽  
Neotectonic Deformation ◽  
Central United States ◽  
Wabash Valley ◽  
Wabash Valley Fault System

Geophysical Setting of the Wabash Valley Fault System

1997 ◽  
Vol 68 (4) ◽  
pp. 567-585 ◽  
Author(s):  
T. G. Hildenbrand ◽  
D. Ravat
Keyword(s):  
Fault System ◽  
Wabash Valley ◽  
Wabash Valley Fault System

Seismic reflection profiling studies of a buried Precambrian rift beneath the Wabash Valley fault zone

Geophysics ◽  
1986 ◽  
Vol 51 (3) ◽  
pp. 640-660 ◽  
Author(s):  
John L. Sexton ◽  
L. W. Braile ◽  
W. J. Hinze ◽  
M. J. Campbell
Keyword(s):  
Seismic Reflection ◽  
Fault System ◽  
Normal Faults ◽  
Rift System ◽  
Seismic Profiles ◽  
Seismic Reflection Data ◽  
Wabash River ◽  
Gravity And Magnetic ◽  
Wabash Valley ◽  
Wabash Valley Fault System

Sixty‐eight kilometers of 12-fold seismic reflection data were collected in the Wabash River Valley of southwestern Indiana and southeastern Illinois to investigate the configuration of a basement structure inferred from regional gravity and magnetic anomaly data. The seismic profiles were also positioned to cross faults of the Wabash Valley fault system in a number of locations. Interpretation of the seismic reflection profiles and detailed gravity and magnetic profile data provides evidence for a series of northeasterly trending grabens in the basement. These grabens are filled with pre‐Mt. Simon layered rocks and are overlain by Paleozoic sedimentary rocks of the Illinois basin. Beneath the Wabash River near Grayville, Illinois, an interpreted graben (the Grayville graben) is approximately 15 km wide and contains about 3 km of fill. Individual boundary faults for the graben cut prominent reflectors within pre‐Mt. Simon rocks and display offsets of up to 500 m. The interpreted configuration of basement faults and thickness of pre‐Mt. Simon layered rocks provide evidence of a late Precambrian rift inferred to be one arm of the New Madrid rift complex. Post‐Pennsylvanian faulting of the Wabash Valley fault system is visible on the seismic reflection record sections as small offsets (less than 100 m) on steeply dipping normal faults. The downward projection of these faults intersects the older large‐offset faults within the pre‐Mt. Simon rocks suggesting that the Wabash Valley faults represent a post‐Pennsylvanian reactivation of the rift system.

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