High resolution 3D laser scanner measurements of a strike-slip fault quantify its morphological anisotropy at all scales

Details High resolution 3D laser scanner measurements of a strike-slip fault quantify its morphological anisotropy at all scales High resolution 3D laser scanner measurements of a strike-slip fault quantify its morphological anisotropy at all scales

2008-01-03

arxiv.org/abs/0801.0544v1

Geophysical Research Letters 33 (2006) L04305

Physics

Geophysics

Scientific paper

10.1029/2005GL025038

The surface roughness of a recently exhumed strikeslip fault plane has been measured by three independent 3D portable laser scanners. Digital elevation models of several fault surface areas, from 1 m2 to 600 m2, have been measured at a resolution ranging from 5 mm to 80 mm. Out of plane height fluctuations are described by non-Gaussian distribution with exponential long range tails. Statistical scaling analyses show that the striated fault surface exhibits self-affine scaling invariance with a small but significant directional morphological anisotropy that can be described by two scaling roughness exponents, H1 = 0.7 in the direction of slip and H2 = 0.8 perpendicular to the direction of slip.

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