High resolution 3D laser scanner measurements of a strike-slip fault   quantify its morphological anisotropy at all scales
  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. 
Francois Renard (LGIT, PGP), Christophe Voisin (LGIT), Davd Marsan   (LGIT), Jean Schmittbuhl (IPGS)