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First- and second-order patterns of stress in the lithosphere: the world stress map project
165A
In Situ Stress
933205 Present-day stress regimes adjacent to active strike-elip faults: California and Sumatra Mount, V S; Suppe, J
Causes and nature of in situ stress
J Geopkys Res V29, NBg, July 1992, P11995-12013
See also: 933003 933201 In sttu measurement of total natural horizontal stresses in an expansive clay Brackley, I J A; Sanders, P J
Geoteelmique V42, N3, Sept 1992, P443-451 In situ horizontal pressures have been monitored at a site of unsaturated swelling lacustrine clay at Vereeniglng, South Africa, using vibrating wire earth pressure cells (BRS cells). The cells, their calibration, and their careful installation at the site are described. Results from a 4 year period are illustrated. Total horizontal earth pressures are 2-3 times vertical pressure, with a superimposed seasonal fluctuation due to rainfall and evapo-transpiration effects. 933202 Regional patterns of tectonic stress in Europe Muller, B; Zoback, M L; Fuchs, K; Mastin, L; Gregersen, S; Pavoni, N; Stephansson, O; Ljunggren, C
J Geophys Res V97, NB8, July 1992, Pl1783-11803 Nearly 1500 stress orientation determinations, obtained using a variety of methods, are now available for Europe. Three distinct regional patterns of maximum compressive horizontal stress are seen: consistent NW to N N W stress orientation in western Europe; WNW-ESE in Scandinavia (similar to that in western Europe but with larger variability of orientation); and consistent E-W orientation with N-S extension in the Aegean Sea and western Anatolia. The factors leading to these stress fields are widely discussed. 933203 First- and second-order patterns of stress in the lithosphere: the world stress map project Zoback, M L
J Geophys Res V97, NB8, July 1992, Pl1703-11728 The World Stress Map project is first outlined and its participants listed. The database assembled, stress indicators and the quality ranking system for stress orientations, and the various methods used to obtain the data are described. First order global stress patterns are illustrated. Inferring crustal stress magnitudes from local stress rotations (relative to regional first order stress orientations) is considered. Second order stress patterns and their possible sources, flexural stress, lateral density contrast/buoyancy forces, and lateral strength contrasts, are discussed. 933204 Recent crustal stress field in central Europe: trajectories and finite element modelling Grunthal, G; Stromeyer, D
J Geophys Res V97, NBg, July 1992, Pl1805-11820 The recent crustal stress field of Central Europe is illustrated, the data coming mainly from published fault plane solutions, in situ stress measurements, fault slip determinations, and repeated precise geodetic triangulations. A steady state elastic finite element model is employed to provide some possible explanations of the observed stress fields as a result of plate driving forces. Many features can be replicated, but a more sophisticated model is necessary to simulate details.
Analysis of wellbore breakouts adjacent to the San Andreas and Great Sumatran faults indicates that maximum horizontal stress direction is oriented at a high angle (70-90 deg) to the faults. This is considered to imply a low shear stress on the faults and suggest that these large crustal-scale strike-slip faults may, in general, be relatively weak interfaces. 933206 Present-day stress regime of the sonthwestern part of the Aquitaine Basin,France, as indicated by oil well data Bell, J S; CalUet, G; Le Marrec, A
J Struct Geol V14, N8/9, Aug~Sept 1992, P1019-1032 Data from 55 wells in the Aquitaine basin have been examined. Horizontal principal stress orientations are inferred from wellbore breakouts. A consistent NE-SW orientation of major principal stress is found around Bordeaux, but this becomes less definitive as the Pyrenees are approached. The reason for this is not fully understood. It may be the result of local structural control of stress orientations or that measurements have been made either side of a boundary between two stress provinces. 933207 Stress field estimation in Hong Kong using the method of hydraulic fracturing Konietzky, H; Rummel, F; Brox, D; Williams, A
Proe ISRM Symposium: Eurock'92, Ckester, 14-17 September 1992 P141-146. Publ London: Thomas Telford, 1992 Hydraulic fracturing stress measurements have been used to measure in situ near-surface (less than 150m depth) stress fields and provide information for assessment of stability of large span excavations in closely jointed granitic and volcanic rocks. Testing procedure and test interpretation are described. Fracture toughness determinations, mini-frac test simulations, and numerical stress field modelling were also carried out. The data obtained allow a reliable picture of the near-surface stress field to be obtained.
Measurement of in situ stress See also: 933267 933208 Stress field determinations in France by hydraulic tests in boreholes Cornet, F H; Burlet, D J Geophys Res V97, NBg, July 1992, Pl1829-11849 Hydraulic tests in boreholes were carried out at 8 sites in France (4 in sedimentary rock, 4 in crystalfine or metamorphic rock). The complete stress field was determined by the hydraulic test on pre-existing fractures (HTPF) technique at 7 sites. Good agreement is found between these results and earlier work. At 4 sites, results are compared to those derived according to hydraulic fracturing theory. Reasons for poor agreement for maximum horizontal stress values are discussed. Unexpectedly low values for vertical stresses found at 4 sites are explained.
© 1993 Pergamon Press Ltd. Reproduction not permitted
In Situ Stress
933205 Present-day stress regimes adjacent to active strike-elip faults: California and Sumatra Mount, V S; Suppe, J
Causes and nature of in situ stress
J Geopkys Res V29, NBg, July 1992, P11995-12013
See also: 933003 933201 In sttu measurement of total natural horizontal stresses in an expansive clay Brackley, I J A; Sanders, P J
Geoteelmique V42, N3, Sept 1992, P443-451 In situ horizontal pressures have been monitored at a site of unsaturated swelling lacustrine clay at Vereeniglng, South Africa, using vibrating wire earth pressure cells (BRS cells). The cells, their calibration, and their careful installation at the site are described. Results from a 4 year period are illustrated. Total horizontal earth pressures are 2-3 times vertical pressure, with a superimposed seasonal fluctuation due to rainfall and evapo-transpiration effects. 933202 Regional patterns of tectonic stress in Europe Muller, B; Zoback, M L; Fuchs, K; Mastin, L; Gregersen, S; Pavoni, N; Stephansson, O; Ljunggren, C
J Geophys Res V97, NB8, July 1992, Pl1783-11803 Nearly 1500 stress orientation determinations, obtained using a variety of methods, are now available for Europe. Three distinct regional patterns of maximum compressive horizontal stress are seen: consistent NW to N N W stress orientation in western Europe; WNW-ESE in Scandinavia (similar to that in western Europe but with larger variability of orientation); and consistent E-W orientation with N-S extension in the Aegean Sea and western Anatolia. The factors leading to these stress fields are widely discussed. 933203 First- and second-order patterns of stress in the lithosphere: the world stress map project Zoback, M L
J Geophys Res V97, NB8, July 1992, Pl1703-11728 The World Stress Map project is first outlined and its participants listed. The database assembled, stress indicators and the quality ranking system for stress orientations, and the various methods used to obtain the data are described. First order global stress patterns are illustrated. Inferring crustal stress magnitudes from local stress rotations (relative to regional first order stress orientations) is considered. Second order stress patterns and their possible sources, flexural stress, lateral density contrast/buoyancy forces, and lateral strength contrasts, are discussed. 933204 Recent crustal stress field in central Europe: trajectories and finite element modelling Grunthal, G; Stromeyer, D
J Geophys Res V97, NBg, July 1992, Pl1805-11820 The recent crustal stress field of Central Europe is illustrated, the data coming mainly from published fault plane solutions, in situ stress measurements, fault slip determinations, and repeated precise geodetic triangulations. A steady state elastic finite element model is employed to provide some possible explanations of the observed stress fields as a result of plate driving forces. Many features can be replicated, but a more sophisticated model is necessary to simulate details.
Analysis of wellbore breakouts adjacent to the San Andreas and Great Sumatran faults indicates that maximum horizontal stress direction is oriented at a high angle (70-90 deg) to the faults. This is considered to imply a low shear stress on the faults and suggest that these large crustal-scale strike-slip faults may, in general, be relatively weak interfaces. 933206 Present-day stress regime of the sonthwestern part of the Aquitaine Basin,France, as indicated by oil well data Bell, J S; CalUet, G; Le Marrec, A
J Struct Geol V14, N8/9, Aug~Sept 1992, P1019-1032 Data from 55 wells in the Aquitaine basin have been examined. Horizontal principal stress orientations are inferred from wellbore breakouts. A consistent NE-SW orientation of major principal stress is found around Bordeaux, but this becomes less definitive as the Pyrenees are approached. The reason for this is not fully understood. It may be the result of local structural control of stress orientations or that measurements have been made either side of a boundary between two stress provinces. 933207 Stress field estimation in Hong Kong using the method of hydraulic fracturing Konietzky, H; Rummel, F; Brox, D; Williams, A
Proe ISRM Symposium: Eurock'92, Ckester, 14-17 September 1992 P141-146. Publ London: Thomas Telford, 1992 Hydraulic fracturing stress measurements have been used to measure in situ near-surface (less than 150m depth) stress fields and provide information for assessment of stability of large span excavations in closely jointed granitic and volcanic rocks. Testing procedure and test interpretation are described. Fracture toughness determinations, mini-frac test simulations, and numerical stress field modelling were also carried out. The data obtained allow a reliable picture of the near-surface stress field to be obtained.
Measurement of in situ stress See also: 933267 933208 Stress field determinations in France by hydraulic tests in boreholes Cornet, F H; Burlet, D J Geophys Res V97, NBg, July 1992, Pl1829-11849 Hydraulic tests in boreholes were carried out at 8 sites in France (4 in sedimentary rock, 4 in crystalfine or metamorphic rock). The complete stress field was determined by the hydraulic test on pre-existing fractures (HTPF) technique at 7 sites. Good agreement is found between these results and earlier work. At 4 sites, results are compared to those derived according to hydraulic fracturing theory. Reasons for poor agreement for maximum horizontal stress values are discussed. Unexpectedly low values for vertical stresses found at 4 sites are explained.
© 1993 Pergamon Press Ltd. Reproduction not permitted