How geometrical constraints contribute to the weakness of mature faults
Article Abstract:
Fault geometry is an component in measurements of the weakness of fault zones. By using only geometrical contraints introduced by fault surfaces, it is possible to predict the apparent friction being exerted on a sawcut granite surface from that measured in intact rock. In contrast to existing models, the true coefficient of friction in this approach is considered to be sensitive to normal stress. This sensitivity is suppressed using the sin phi dependence brought by the fault zone geometry's simple shear constraints. This model highlights the importance of microphysical processes affecting friction in brittle substances.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Large igneous province on the US Atlantic margin and implications for magmatism during continental breakup
Article Abstract:
The thick igneous section which transects the US Atlantic continental margin may extend along the entire length of the margin as well, and may have a volume of as much as 3.2 x 10 to the sixth power cubed kilometers. The two sections of the margin previously found to contain 20-25 km thick igneous sections are not the exception, but the rule. This is suggested by similar sections found in two other areas of the margin and the presence of the East Coast magnetic anomaly. Non-plume processes probably created the thick igneous crust.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Crust in mantle overdrive
Article Abstract:
A new model of how mantle convection results in mountain building has been proposed. L.I. Makeyeva, L.P. Vinnik and S.W. Roecker examined seismograms from the Tien Shan mountain range in central Asia and concluded that mantle material may flow parallel to a geological belt where mountains are forming instead of sinking away from the belt as the conventional theory holds. Mantle material can even flow upwards toward the mountains. An innovative feature of this research was the use of anisotropy.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
User Contributions:
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