Results 161 to 170 of about 3,355 (205)

Gulf of Aqaba Paleostresses status and rifting events

GEO 2008, 2008
Natural fractures and faults are the primary pathways for hydrocarbon migration along with production in many reservoirs. In addition, critically stressed faults (pre-existing faults active in the present stress field) can systematically control permeability, and hence high fluid flow.
Abdelwahab Noufal, M. Dia Mahmoud
openaire   +1 more source

Paleostresses associated with faults of large offset

Journal of Structural Geology, 1991
Abstract In order to test empirically the limitations of paleostress analysis, we used Etchecopar's computer program to compute the orientations and relative magnitudes of paleostress principal values in two southern Appalachian (U.S.A) thrust zones from minor fault and slickenside attitudes.
Steven Wojtal, Jonathan Pershing
openaire   +1 more source

Using joint interactions to estimate paleostress ratios

Journal of Structural Geology, 1988
Because they grow perpendicular to a minimum principal stress (σ3), joints are paleostress markers. Younger joints may show a systematic change in orientation as they approach older, throughgoing, joints. This change in orientation reflects a change in the stress field in which the younger joint set is growing. Analytical solutions for the stress field
openaire   +1 more source

Tectonophysical Paleostress Reconstructions: Interpretation Challenges and Possible Solutions

Russian Geology and Geophysics, 2019
Abstract —Paleostress inversion may be ambiguous when several markedly different local stress states are inferred for a group of outcrops. Attempts of reconstructing regional stress regimes (compressional, extensional, or strike-slip) by selecting local principal stresses of proximal directions turn out to have poor grounds.
Yu.L. Rebetsky, A.V. Marinin, L.A. Sim
openaire   +1 more source

Paleostress analysis from sheared dike sets

Geological Society of America Bulletin, 1989
It is a frequently reported feature of basement terranes that dikes intruded late in the deformation sequence become sheared parallel to the dike margins. It is proposed that such sets of sheets with internal fabrics produced by this shearing along their walls are structures which are dynamically analogous to reactivated faults.
openaire   +1 more source

Inferring paleostresses from natural fracture patterns: A new method

Geology, 1989
We introduce a method to infer the remote differential stress magnitude from the curvature of overlapping echelon fracture traces. The curving paths of overlapping echelon cracks imply the predominance of local crack-induced stresses over remote stresses during propagation.
Jon Olson, David D. Pollard
openaire   +1 more source

Paleostress determination in a rock by a fractographic method

Journal of Structural Geology, 1988
Abstract A fractographic technique, hitherto used in ceramics for the evaluation of fracture stress, is adapted here to calculate fracture paleostresses in rocks. An example from a granite in East Sinai is analyzed. The results obtained for the ranges of local paleofracture stress, the severest flaw size and the initial stress intensity factor agree ...
Dov Bahat, A. Rabinovitch
openaire   +1 more source

Observed Paleostress Orientations and Predicted Plate-Hotspot Motions

2003
As Plate Tectonics matured, a number of workers began to consider philosophical implications of the science. Allan Cox (1973), in particular, found Thomas Kuhn’s “Structure of Scientific Revolutions”; published in the same year as Harry Hess’s “History of ocean basins — an essay in geopoetry”, to be directly applicable to the experience of earth ...
openaire   +1 more source

Mechanical analysis of fault slip data: Implications for paleostress analysis

Journal of Structural Geology, 2011
Abstract Stress inversions are a useful and popular tool for structural geologist and seismologist alike. These methods were first introduced by Wallace (1951) and Bott (1959) and subsequent studies continue to be based on their assumptions: the remote stress tensor is spatially uniform for the rock mass containing the faults and temporally ...
J.O. Kaven, F. Maerten, D.D. Pollard
openaire   +1 more source

y-gRaph: An OpenOffice application to reconstruct paleostress fields from striated faults

Computers & Geosciences, 2014
y-gRaph, a user-friendly spreadsheet for reconstructing paleostress fields by means of the y–R diagram is presented. The y–R diagram is based on Bott's equation and translates the parameters of the stress ellipsoid to a XY plot representing the maximum horizontal stress orientation (σy) and the stress ratio (R), compatible with a given set of striated ...
Pablo, Calvín, Pablo, Santolaria, TIERZ LOPEZ, PABLO, Alicia, Muñoz, Antonio, Casas, Luis, Arlegui, María, Antonia Zapata   +6 more
openaire   +1 more source