Ad. Huerta et Dw. Rodgers, KINEMATIC AND DYNAMIC ANALYSIS OF A LOW-ANGLE STRIKE-SLIP-FAULT - THELAKE-CREEK FAULT OF SOUTH-CENTRAL IDAHO, Journal of structural geology, 18(5), 1996, pp. 585-593
A large, low-angle strike-slip fault with significant offset is presen
t in south-central Idaho. The 40+ km long Lake Creek fault is oriented
N50 degrees W, 30 degrees SW and has a slip vector 18 km long, plungi
ng 2 degrees to N55 degrees W. Slip was determined by restoring the of
fset of a map-scale fold trough. Thus, the fault is a dextral-normal f
ault with predominant dextral strike-slip and minimal normal dip-slip
displacement. The present-day gentle dip of the fault appears to be th
e original dip since older folds and coeval to younger dykes in the ar
ea are not tilted. Several hypotheses for the origin of the low-angle
fault are rested. Field and kinematic data support the interpretation
that the fault formed as a low-angle strike-slip fault, not as a react
ivated thrust fault nor in association with other regional fault syste
ms. Based on fault array analysis and published experimental fault stu
dies, the Lake Creek fault is interpreted to have formed as a low-angl
e strike-slip fault owing to a nearly axial compressive state of stres
s with a subhorizontal ol, and crustal anisotropy induced by NW-trendi
ng folds and SW-dipping axial planar cleavage. Copyright (C) 1996 Else
vier Science Ltd