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Bulletin of the Seismological Society of America; October 1980; v. 70; no. 5; p. 1521-1526
© 1980 Seismological Society of America
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Slip vectors on faults near Salt Lake City, Utah, from quaternary displacements and seismicity

TERRY L. PAVLIS and R. B. SMITH

DEPARTMENT OF GEOLOGY AND GEOPHYSICS UNIVERSITY OF UTAH, SALT LAKE CITY, UTAH 84112

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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