Estimation of average to maximum displacement ratio by using fault displacement-distance profiles
Por:
Xu, SS, Nieto-Samaniego, AF, Alaniz-Alvarez, SA
Publicada:
1 dic 2014
Resumen:
Fault displacement is an important factor in the study of discontinuous
deformation. Considering that the values of average displacement (D-av)
and maximum displacement (D-mx) are linearly related by D-av = rho D-mx
we calculate the values of rho estimated from 205 published
displacement-distance profiles. The following results are obtained: (a)
the value of rho is largest for the mesa-type or flat-topped (M-type)
profiles; (b) the value of rho increases when ductile (continuous)
deformation is added to the displacement profile; (c) generally, the
value of rho for a linked fault array is smaller than that for segmented
faults in the array, i.e., the value of rho changes with fault
evolution, and at the stage where linkage occurs, the value of rho
becomes smaller; (d) the simulation results indicate that for an ellipse
function, the value of rho varies from 0.667 to 0.785. For trapezoid
(M-type) profiles, the value of rho is from 0.5 to 1, depending on the
ratio of the upper base to the lower base. For best fit polynomial
curves, the value of rho can be less than 0.5; (e) the values of rho
more frequently observed in the published profiles are between 0.6 and
0.7; the average value is 0.6023 and the standard deviation 0.1123.
These data indicate that the displacement-distance profiles are hybrids
from the triangular profile to the elliptical or mesa profile. The
average value (0.6023) would be useful to determine the average
displacement in cases where not enough displacement data can be
obtained. Finally, the value change of rho with fault evolution can be
used to quantitatively evaluate the level of interaction between
segmented faults. (C) 2014 Elsevier B.V. All rights reserved.
Filiaciones:
Xu, SS:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76230, Mexico
Nieto-Samaniego, AF:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76230, Mexico
Alaniz-Alvarez, SA:
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro 76230, Mexico
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