Hello everyone
we would like to draw your attention to Session TS2.3 at the EGU General
Assembly, Vienna, April 15-20, 2007.
http://meetings.copernicus.org/egu2007/
Deadline for support applications: 08 December 2006
Deadline for receipt of abstracts: 15 January 2007
Tectonics and Structural Geology
TS2.3 Controls on the 3D Orientation of Brittle Fractures: Integrating
Theory with Field & Laboratory Measurements
The three-dimensional (3D) orientation of brittle fractures and fracture
sets has important implications for earthquake seismology, rock mass
stability and fluid flow in fractured rocks because these structures exert a
fundamental control on the evolution of bulk properties such as
permeability. This session will attempt to strengthen our theoretical
understanding and provide better links with measurements of slip surface
orientations from the lab and the field. Historically, both the theoretical
analysis and the practical measurement of localisation structures in rocks
has been simplified to a 2D situation, either by considering only plane
strain boundary conditions, or by assuming that the intermediate stress has
no influence on fault development. In general, deformation of the
lithosphere must involve non-plane 3D strain to a significant degree. Recent
work by the conveners and the invited speakers highlights the need for fully
3D dynamic, physics-based models of natural deformation, including the
development of advanced constitutive laws and numerical strategies to
accommodate such deformation. We invite contributions addressing the theory
and numerical modelling of brittle deformation, supported by field or
laboratory observations. Localised slip systems of interest include, but are
not limited to shear fractures, faults and deformation bands.
Conveners:
D. Healy
Earth Sciences, University of Durham, UK
R. Borja
Civil and Environmental Engineering, Stanford University, USA
R. Jones
Geospatial Research Ltd, University of Durham, UK
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