Faulting in southwest Indiana
Faults of the Wabash Valley Fault System, faults in Perry and Spencer Counties, Indiana, and the Mt. Carmel Fault are of the normal type and high angle and occur as single fault planes or as well-defined compound faults as much as 50 miles long with displacements ranging from a few feet to more than 400 feet. The Wabash faults and those in Perry and Spencer Counties were formally mapped, described, and named for the first time. Although supporting deep-drilling data are sparse, the Wabash and Mt. Carmel faults are probably present at depth, where they may form major structural alignments in basement rocks. No past studies have associated earthquake centers with any of the faults. The Wabash and Perry and Spencer County faults are post-Pennsylvanian and pre-Pleistocene in age. Early movement on the Mt. Carmel Fault is post-Valmeyeran, possibly Chesterian in age. The Wabash faulting is probably related to the regional tectonics that produced the New Madrid disturbance, but it is not a direct continuation of New Madrid faulting across the Rough Creek Fault Zone. The Mt. Carmel Fault may be associated with the hinge line of the eastern shelf of the Illinois Basin.
- Research Organization:
- Indiana Geological Survey, Bloomington (USA)
- OSTI ID:
- 6720625
- Report Number(s):
- NUREG/CR-2908; ON: DE83900411
- Country of Publication:
- United States
- Language:
- English
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