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Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

2002

Environmental Sciences

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Articles 1 - 3 of 3

Full-Text Articles in Physical Sciences and Mathematics

‘A View From Johannesburg.’ Daily Reports On The World Summit On Sustainable Development, Nat Quansah Aug 2002

‘A View From Johannesburg.’ Daily Reports On The World Summit On Sustainable Development, Nat Quansah

Nat Quansah

No abstract provided.

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Deformation Associated With A Continental Normal Fault System, Western Grand Canyon, Arizona, Phillip Resor, David Pollard Dec 2001

Deformation Associated With A Continental Normal Fault System, Western Grand Canyon, Arizona, Phillip Resor, David Pollard

Phillip G Resor

In the western Grand Canyon, the Colorado River cuts through a series of moderate offset normal faults that mark the transition between the Colorado Plateau and the Basin and Range tectonic provinces. Both hanging wall and footwall rocks are exposed over > 1,000 m of vertical section, and contain relatively simple pre-existing structures. The area thus presents an opportunity to investigate processes of continental extension without cross-cutting fault patterns and large rotations typical of much of the Basin and Range. We have mapped 8 km of the Froggy Fault, including ~ 600 m of vertical section, and deformed strata of the …

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Slip Inversion On Complex Fault Surfaces Using Angular Elastic Dislocations, Phillip Resor, L Maerten, F Maerten Dec 2001

Slip Inversion On Complex Fault Surfaces Using Angular Elastic Dislocations, Phillip Resor, L Maerten, F Maerten

Phillip G Resor

We present a new 3D slip-inversion method based on the analytical solution of an angular dislocation in a linear-elastic, homogeneous, isotropic, whole- or half-space. The approach uses a boundary element method (BEM) that employs planar triangular elements of constant displacement to model fault surfaces. Discretization of surfaces into triangular boundary elements allows the construction of complex 3D fault surfaces with irregular tipline and no overlaps or gaps. A damped least squares method is used to minimize the functional ¶llel.b-d∥2+ɛ^{2}∥ bigtriangledown .b∥ ^{2},where b represents the slip distribution on the faults, φ the influence coefficient matrix and d the observed deformation …

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