HR: 0830h
AN: NG31A-0604    [PDF]
TI: Anisotropic scaling of Hawaiian lava flow textures
AU: * Gaonach, H
EM: helene@thermos.geotop.uqam.ca
AF: GEOTOP-UQAM-McGILL, Universite du Quebec … Montreal, Montreal, Qc H3C 3P8 Canada
AU: Beaulieu, A
EM: beaulial@thermos.geotop.uqam.ca
AF: GEOTOP-UQAM-McGILL, Universite du Quebec … Montreal, Montreal, Qc H3C 3P8 Canada
AU: Lovejoy, S
EM: shaun@physics.mcgill.ca
AF: Depart. Physics, McGill University, Montreal, Qc H3A 2T8 Canada
AB: Highly variable processes spanning wide ranges of scale abound in volcanological, geophysical and environmental systems, consequences of the highly nonlinear dynamics. A particular and prominent aspect is the ubiquity of scaling properties, implying a scaling symmetry over a wide range of scales. Lava flow emplacement is an example of such natural scaling dynamic process. Textural morphology of lavas is an expression of the intense stress applied at the surface during an eruption over a large range of scales. While the existence of a scaling and multiscaling may reveal the continuity of a dynamic process over these scales it is also important to consider these properties in a more general context where the (scale by scale) differential anisotropy is taken into account. In such cases, generalized scale invariance (GSI) will provide new powerful insights for describing highly variable anisotropic phenomena. We will discuss this question through Hawaiian Pahoehoe and A'a textures. Anisotropy at one scale and differential anisotropy will be considered to quantitatively statistically distinguish between these two types of lava flows.
DE: 3220 Nonlinear dynamics
DE: 3250 Fractals and multifractals
DE: 8429 Lava rheology and morphology
SC: Nonlinear Geophysics [NG]
MN: 2003 Fall Meeting