Modern tectonic stress field in the Mediterranean region: evidence for variation in stress directions at different scales

Rebaï, Samira; Philip, H.; Taboada, Alfredo

doi:10.1111/j.1365-246x.1992.tb00717.x

Cited by 226 publications

(140 citation statements)

References 92 publications

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“…nucleation of a later deformation [2,49]. The reactivation of pre-existing basement discontinuities produces stress deflections and principal stress axis permutations [50,51]. In this sense, the occurrence of extensional and strike-slip stress tensors in the same site is often the result of a local σ 1 − σ 2 permutation, rather than a global tendency of progressive change from one stress regime to another over a short period of time.…”

Section: Resultsmentioning

confidence: 99%

Alpine paleostress reconstruction and active faulting in Western Iberia

2010

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Abstract:The study of intraplate tectonics is crucial for understanding the deformation within plates, far from active plate boundaries and associated stress transmission to the plate interiors. This paper examines the tectonic evolution of the Variscan basement at the western margin of the Cenozoic Duero basin. Located east of the Vilariça Fault System in NW Iberia, this intraplate zone is a relatively flat but elevated area with an intense NNE-SSW trending fault system and associated moderate seismicity. Although the area has played an important role in the Duero basin configuration, its Alpine to present-day tectonic evolution has not been well constrained. In order to characterize the successive paleostress fields, 1428 pairs of fault-striae were measured at 56 sites and two focal mechanisms were used. Stress inversion methods have been applied to analyze paleostress regimes. Results show the existence of three dominant maximum horizontal stress (Shmax) trends: N-S, NE-SW and E-W. Relative and absolute dating of the activated faults for each Shmax shows that the clearly predominant N-S paleostress field in the zone has been active since the Oligocene up to the present day; while a NE-SW stress field is found to have been active during the Cretaceous and an older E-W paleostress field was active in the earlier Alpine cycle (Late Triassic).

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Section: Resultsmentioning

confidence: 99%

Alpine paleostress reconstruction and active faulting in Western Iberia

2010

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“…The interpretation of the identified surface faults allows to explain the extensional focal mechanism of some aftershocks in the transpressional regime (σ Hmax oriented NW-SE) generally recognized in this area. (Rebaï et al, 1992;Delouis et al, 1993;Souriau and Pauchet, 1998;Souriau et al, 2001;Baubron et al, 2002;Rigo et al, 2005, among others). The faults and fractures identified are E-W to NW-SE oriented and less than 3 km long.…”

Section: The Arudy Epicentral Areamentioning

confidence: 98%

Active Tectonics of the Pyrenees: A review

Lacan

Ortuño

2012

Journal of Iberian Geology

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The Pyrenees have experienced at least seven earthquakes with magnitude M > 5 in the last 400 years. During the last decades, several seismotectonic, neotectonic and paleoseismological studies have focused on identifying the main active structures of the areas experiencing damaging earthquakes. In spite of these studies, the regional stress regime is still discussed and there is no unequivocal seismotectonic model at the scale of the range. In this paper, we first present a revision of the former works on active faults in the Pyrenees, and then we discuss the main results in terms of their neotectonic setting. We have distinguished five neotectonic regions according to their seismicity, faulting style and morphologic evolution: the westernmost Pyrenees, the North Western Pyrenean zone, the Foreland basins, the Lower Thrust Sheets Domain and the Eastern Pyrenees. This review lead us to differentiate the range into two major domains: the High Chain, where active faults are controlled by vertical maximum stresses, and the Low Chain, where horizontal maximum stresses of variable orientation seem to be dominant. We propose that these different stress domains are related to the isostatic rebound in response to either the difference in crustal thickness and/or the distribution of the Plio-Quaternary erosion.

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“…However, it is important to keep in mind that different directions of stresses or superposed stress states do not necessarily indicate polyphase tectonics. Stresses may show local deflections (e.g., Rawnsley et al, 1992;Rebaï et al, 1992;Petit and Mattauer, 1995;Homberg et al, 1997;Kattenhorn et al, 2000) or rapidly vary in a locality (e.g., Hauksson, 1994;Homberg et al, 1999;Bergerat and Angelier, 2000;Homberg, 2000) even if the overall state of stresses is homogeneous. Relative chronologies are the most factor in assigning deviated stress states to otherwise homogeneous stress field.…”

Section: Stress Field and Large-scale Faultingmentioning

confidence: 99%

Structural inheritance and cenozoic stress fields in the Jura fold-and-thrust belt (France)

et al. 2002

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Based on an analysis of 8000 minor fault-slip data in the Jura Mountains (France), we discuss the influence of pre-existing discontinuities on the development of fold-and-thrust belts. We present palinspastic maps showing the stress fields and active faults during the Cenozoic pre-orogenic events in the Jura belt prior to the main Late Miocene fold-and-thrust tectonics. During the Eocene, a N -S strike-slip regime produced a few NNE -SSW sub-vertical strike-slip faults in the central external Jura and a few E -W reverse faults in the eastern Jura near the future frontal thrust. During the Oligocene, an average WNW -ESE extension, with irregular stress trajectories, resulted in normal faulting along N -S to NE -SW trends in the external part of the belt, WNW -ESE trends along the future northern and northeastern frontal thrust, and NW -SE trends in the internal Jura. The Late Miocene tectonics began with a strike-slip regime with a fan-shaped compressional trajectory. It was followed by a stress field with similar stress direction, but local r 2 /r 3 stress permutation resulted in strike-slip regime domains contrasting with reverse regime domains. Stress deflections and permutations occurred near inherited cover and basement discontinuities. Major deformation zones, like the Jura frontal thrust onto the foreland, the thrust of the internal central Jura onto the external Jura, and the narrow deformation bands within the flat-lying plateaus formed close to the inherited faults. The structural style of the Jura belt thus partly mimics the pre-orogenic fault pattern. Stress deflections point to the pre-orogenic faults, express the indentation process of the Jura by its hinterland, and highlight successive slip events along major faults during the fold-and-thrust tectonics. This case study illustrates the relevance of minor fault-slip studies for characterizing both the pre-orogenic tectonics and the kinematics of the deformation. D

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Modern tectonic stress field in the Mediterranean region: evidence for variation in stress directions at different scales

Cited by 226 publications

References 92 publications

Alpine paleostress reconstruction and active faulting in Western Iberia

Alpine paleostress reconstruction and active faulting in Western Iberia

Active Tectonics of the Pyrenees: A review

Structural inheritance and cenozoic stress fields in the Jura fold-and-thrust belt (France)

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