Tectonic Stresses in the Alpine-Mediterranean Region

Transcription

1 Rock Mechanics Felsmechanik Mecanique des Roches Supplementum 9 Tectonic Stresses in the Alpine-Mediterranean Region Proceedings of the Symposium Held in Vienna,Austria, September 13-14, 1979 Under the Auspices of the Working Group 3 of the Interunion Commission of Geodynamics and the European Geophysical Society Edited by Adrian E. Scheidegger 1980 Springer-Verlag Wien New York

2 Prof. Dipl.-Phys. Dr. phil. Adrian E. Scheidegger Institute of Geophysics Technical University Wien, Austria With 122 Figures This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks by Springer-Verlag/Wien ISSN ISBN-13 : e-isbn -13 : DOl: /

3 Preface The idea of the present symposium was conceived a few years ago by the Working Group 3 (WG3) of the Interunion Commission of Geodynamics (ICG). Now that its Program has been completed, it was decided to present the results of that part of the activities of the WG3 indicated in the symposium title. The writer was asked by the WG3 to coordinate the contributions. The European Geophysical Society (EGS) kindly offered to host the symposium during its meeting in Vienna in September, 1979, and Springer-Verlag in Vienna agreed to publish a "Proceedings" volume of the Symposium. These efforts are gratefully acknowledged. The whole subject matter of the symposium was divided into 6 "themes". The first concerns in situ stress determinations, the second deals with stresses as inferred from fault-plane solutions of earthquakes, the third geomorphic and geological effects of stresses, the fourth petrofabrics and stresses, the fifth recent displacements and the sixth geomechanical models. Upon the recommendation of the WG3, contributors were invited to present papers falling under the themes mentioned. The symposium, however, was also open to unsolicited contributors in the general call for papers for the EGS-meeting. It is hoped that the papers will present a fairly complete picture of the results obtained in the study of tectonic stresses in the Alpine-Mediterranean region during the ten years of the duration of the International Geodynamics Program. A. E. Scheidegger

4 Contents Theme 1 In Situ Stress Measurements Hast, N.: Stress Fields, Fracture Systems and the Mechanism for Movements in the Gneiss-Granite Area of the Mont Blanc Massif Greiner, G., Lohr, J.: Tectonic Stresses in the Northern Foreland of the Alpine System. Measurements and Interpretation Paquin, c., Froidevaux, c.: Tectonic Stresses in France Froidevaux, c., Paquin, c., Angelidis, c., Tzitziras, A.: In Situ Stress Measurements in Greece Kohlbeck, F., Roch, K.-H., Scheidegger, A. E.: In Situ Stress Measurements in Austria Martinetti, S., Ribacchi, R.: In Situ Stress Measurements in Italy Schafer, K.: In Situ Strain Measurements in Libya Theme 2 Stresses Inferred from Fault Plane Solutions of Earthquakes Pavoni, N.: Crustal Stresses Inferred from Fault-Plane Solutions of Earthquakes and Neotectonic Deformation in Switzerland Schneider, G.: Seismic Stresses in Southern Germany Udias, A.: Seismic Stresses in the Region Azores - Spain - Western Mediterranean Gasparini, c., Iannaccone, G., Scarpa, R.: On the Focal Mechanism of Italian Earthquakes Theme 3 Geomorphic and Geological Effects of Stresses Gerber, E.: Geomorphological Problems in the Alps Scheidegger, A. E.: Alpine Joints and Valleys in the Light of the Neotectonic Stress Field

5 VI Contents 5tovitkova, Nadezda: Tectonic Stresses as Determined from the Character of Fault Systems in the Bohemian Massif Degan, F., Martino, E., Pianetti, F., Zanferrari, A.: Mathematical Representation of the Fractl,Ire Field in the Venetian Alps (NE Italy). Preliminary Results Theme 4 Petrofabrics and Stresses Schafer, K.: Palaeo- and Recent Stress Fields in Tunisia and Libya from the Cenozoic Structural Bearing Gueguen, Y., Darot, M.: Microstructures and Stresses in Naturally Deformed Peridotites Letouzey, J., Tremolieres, P.: Paleo-Stress Fields Around the Mediterranean Since the Mesozoic from Microtectonics. Comparison with Plate Tectonic Data Theme 5 Recent Displacements Gubler, E.: Vertical Movements in Switzerland Hoggerl, N.: Repeated Levelling and Vertical Crustal Movements. Problems and Results Theme 6 Geomechanical Models Neugebauer, H. J.: On the Nature of the Alpine Stress Field Milller, W. H., Hsil, K. J.: Stress Distribution in Overthrusting Slabs and Mechanics of Jura Deformation Bodri, L., Bodri, B.: Numerical Simulation of Initiating Processes of the Evolution of Sedimentary Basins: The Pannonian Basin Shulman, M., Skala, W.: Reconstruction of Stress Fields for the Aegean by a Finite Element Model