On the strength of oceanic fracture zones and their influence on the intraplate stress field

1992 ◽  
Vol 97 (B11) ◽  
pp. 15365 ◽  
Author(s):  
Eric A. Bergman ◽  
Sean C. Solomon
Keyword(s):  
Stress Field ◽  
Fracture Zones ◽  
Intraplate Stress

The origins of the intraplate stress field in continental Australia

1995 ◽  
Vol 133 (3-4) ◽  
pp. 299-309 ◽  
Author(s):  
David D. Coblentz ◽  
Mike Sandiford ◽  
Randall M. Richardson ◽  
Shaohua Zhou ◽  
Richard Hillis
Keyword(s):  
Stress Field ◽  
Intraplate Stress

Statistical trends in the intraplate stress field

1995 ◽  
Vol 100 (B10) ◽  
pp. 20245-20255 ◽  
Author(s):  
David D. Coblentz ◽  
Randall M. Richardson
Keyword(s):  
Stress Field ◽  
Intraplate Stress ◽  
Statistical Trends

Stress magnitudes in the crust: constraints from stress orientation and relative magnitude data

1991 ◽  
Vol 337 (1645) ◽  
pp. 181-194 ◽  
Keyword(s):  
Stress Field ◽  
Plate Boundary ◽  
Horizontal Stress ◽  
Crustal Thickening ◽  
Viscous Drag ◽  
Stress Orientation ◽  
Relative Stress ◽  
Stress Orientations ◽  
Intraplate Stress

The World Stress Map Project is a global cooperative effort to compile and interpret data on the orientation and relative magnitudes of the contemporary in situ tectonic stress field in the Earth's lithosphere. Horizontal stress orientations show regionally uniform patterns throughout many continental intraplate regions. These regional intraplate stress fields are consistent over regions 1000-5000 km wide or ca . 100 times the thickness of the upper brittle part of the lithosphere ( ca . 20 km) and about 10-15 times the thickness of typical continental lithosphere ( ca . 150-200 km). Relative stress magnitudes or stress regimes in the lithosphere are inferred from direct in situ stress measurements and from the style of active faulting. The intraplate stress field in both the oceans and continents is largely compressional with one or both of the horizontal stresses greater than the vertical stress. The regionally uniform horizontal intraplate stress orientations are generally consistent with either relative or absolute plate motions indicating that plate-boundary forces dominate the stress distribution within the plates. Since most regions of normal faulting occur in areas of high elevation, the extensional stress régimes in these areas can be attributed to superimposed bouyancy forces related to crustal thickening and/or lithosphere thinning; stresses derived from these bouyancy forces locally exceed mid-plate compressional stresses. Evaluating the effect of viscous drag forces acting on the plates is difficult. Simple driving or resisting drag models (with shear tractions acting parallel or antiparallel to plate motion) are consistent with stress orientation data; however, the large lateral stress gradients across broad plates required to balance these tractions are not observed in the relative stress magnitude data. Current models of stresses due to whole mantle flow inferred from seismic tomography models (and with the inclusion of the effect of high density slabs) predict a general compressional stress state within continents but do not match the broad-scale horizontal stress orientations. The broad regionally uniform intraplate stress orientations are best correlated with compressional plate-boundary forces and the geometry of the plate boundaries.

Intraplate stress field in South America from earthquake focal mechanisms

2016 ◽  
Vol 71 ◽  
pp. 278-295 ◽  
Author(s):  
Marcelo Assumpção ◽  
Fábio L. Dias ◽  
Ivan Zevallos ◽  
John B. Naliboff
Keyword(s):  
South America ◽  
Stress Field ◽  
Focal Mechanisms ◽  
Earthquake Focal Mechanisms ◽  
Intraplate Stress

scholarly journals Morphotectonics of the Mascarene Islands

1998 ◽  
Vol 41 (2) ◽  
Author(s):  
R. Hantke ◽  
A. E. Scheidegger
Keyword(s):  
Indian Ocean ◽  
Stress Field ◽  
Fracture Zone ◽  
Hot Spot ◽  
Ocean Bottom ◽  
Fracture Zones ◽  
Mascarene Islands ◽  
The Indian Ocean ◽  
Close Fit

A study is made of the orientations (strikes/trends) of joints, valleys, ridges and lineaments, i.e. of the (potentially) morphotectonic features, of the Mascarene Islands (Reunion, Mauritius and Rodrigues) in the Indian Ocean. It turns out that a connection exists between these features on all islands. For the joints alone, the results for Mauritius as a whole agree closely with those for Rodrigues as a whole, and also partially with those of Reunion. Inasmuch as the trends of the valleys, ridges and lineaments are related to the trends (strikes) of the joints, a common morphotectonic predesign seems to be present for all features studied. The morphotectonic orientations on the island also agree closely with the trends of fracture zones, ridges and trenches in the nearby ocean bottom; which has had a bearing on the theories of the origin of the Mascarene Islands. Generally, a hot-spot origin is preferred for Reunion, and may be for Mauritius as well, although differing opinions have also been voiced. The dynamics of a hot-spot is hard to reconcile with the close fit of the joint strikes in Réunion with the trends of the Madagascar and Rodrigues fracture zones. The closely agreeing joint maxima in Mauritius and Rodrigues í across the deep Mauritius trench í also agree with the trend of that trench and with the trend of the Rodrigues fracture zone. Thus, it would appear as most likely that the trends of joints and of fracture zones are all part of the same pattern and are due to the same cause: viz. to action of the neotectonic stress field.

Analysis of the South American intraplate stress field

1996 ◽  
Vol 101 (B4) ◽  
pp. 8643-8657 ◽  
Author(s):  
David D. Coblentz ◽  
Randall M. Richardson
Keyword(s):  
Stress Field ◽  
South American ◽  
The South ◽  
Intraplate Stress
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