scholarly journals Upper Cretaceous and Paleogene sedimentary rocks and isotopic ages of Paleogene tuffs, Uinta Basin, Utah. Ages of late Paleogene and Neogene tuffs and the beginning of rapid regional extension, eastern boundary of the Basin and Range Province near Salt Lake City, Utah

1989 ◽  
1980 ◽  
Vol 70 (5) ◽  
pp. 1521-1526
Author(s):  
Terry L. Pavlis ◽  
R. B. Smith

abstract Slip vectors, derived from striations on variably oriented faults along the west and south sides of a bedrock spur north of Salt Lake City, Utah, indicate a consistent relative motion between the spur and the Salt Lake Valley during Quaternary time. The possibility of motion of coherent crustal blocks during basin and range type faulting suggests: (1) segmentation of major fault zones, such as the Wasatch fault zone, into independent crustal blocks, complicates the evaluation of earthquake hazards because of the unknown relationships between individual faults; and (2) if this pattern of crustal deformation is characteristic of the Basin and Range Province, then fault-plane solutions for this area should be carefully evaluated because they may reflect local displacements rather than the effects of the regional stress field.


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