Electronic Resource
Springer
International journal of earth sciences
88 (1999), S. 532-550
ISSN:
1437-3262
Keywords:
Key words Eastern Alps
;
South Bohemian basement spur
;
Fault plane solutions
;
Borehole breakouts
;
Stress field
;
Stress decoupling
;
Present-day deformation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract We analysed fault plane solutions and borehole breakouts in the eastern part of the Eastern Alps and found a heterogeneous stress field which we interpret as a transition zone of three different stress provinces: the western European stress province with NW to NNW SH orientation and mainly strike-slip faulting regime; the Adriatic stress province with a radial stress pattern and thrust faulting to strike-slip faulting regime; and the Dinaric-Pannonian stress province with NE SH orientation and strike-slip faulting regime. The western Pannonian basin seems to be a part of the transition zone with WNW to NW SH orientation. A stress regime stimulating strike-slip faulting prevails in the Eastern Alps. The south Bohemian basement spur as a major tectonic structure with a high rheological contrast to surrounding units has a strong influence on the stress field and exhibits the highest seismicity at its tip due to stress concentration. From a constructed vertical stress orientation profile we found stress decoupling of the Northern Calcareous Alps from the underlying European foreland. Both the Molasse and the Flysch-Helvetic zone are considered as candidates for decoupling horizons due to stress orientation observations and due to their rheological behaviour. From seismological and rheological data, we suggest a horizontal stress decoupling across the Eastern Alps caused by a weakened central Alpine lithosphere.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s005310050283
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