Recent stress field and neotectonics in the Eastern Jura Mountains,Switzerland |
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| Institution: | 1. Geologisches Institut, Universität Karlsruhe Federal Republic of Germany;2. Geophysikalisches Institut, Universität Karlsruhe Federal Republic of Germany;3. NAGRA, BadenSwitzerland;1. Oxford Brookes University, United Kingdom;2. Cardiff Metropolitan University, United Kingdom;3. University of Gloucestershire, United Kingdom;1. Korean Police HRD Institute, Mugunghwa-ro 111, Asan-si, Chungcheongnam-do, 31540, South Korea;2. Department of Social Psychology, Sookmyung Women''s University, Yongsan-gu Chungpa-ro 47 Gil 100, Seoul, 04310, South Korea;1. Department of Psychology, University of California Los Angeles, Los Angeles, California;2. Department of Psychiatry and Biobehavioral Sciences, University of California Los Angeles, Los Angeles, California;1. Key Laboratory of Active Tectonics and Volcanoes, Institute of Geology, China Earthquake Administration, P.O. Box 9803, Beijing, 100029, China;2. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, P.O. Box 9803, Beijing, 100029, China;3. Department of Earth Science and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia;4. Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK |
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| Abstract: | The regional stress field and its local variation were determined for the northern part of central Switzerland (Fig. 1) by using overcoring techniques (doorstopper, triaxial strain cell) and observations of breakouts in deep boreholes. The results are compared with fault plane solutions of earthquakes and with the orientation of horizontal stylolites.In the northern part of central Switzerland the NW-SE-orientation of the maximum horizontal stress (SH) which is characteristic for Central Europe was observed only in the crystalline basement. In the Folded Jura and south of it in one well the greatest principal horizontal stress above the Triassic decollement horizon is oriented approximately in a N-S to NNE-SSW direction.This direction persists into the western Tabular Jura and the southernmost Rhine Graben. Only in the eastern part of the Tabular Jura the greatest principal horizontal stress shows a NNW-SSE to NW-SE orientation. Comparison of the near surface stress field as determined by in situ stress measurements and borehole breakouts with the directions of horizontal stylolites generated during the evolution of the Folded Jura, indicates that the orientation of the recent stress field near the earth's surface is the same as that which prevailed during the Upper Miocene to Lower Pliocene.The central part of northern Switzerland is therefore the first area in Central Europe where it is possible to demonstrate that the near surface stress field is decoupled from that in the crystalline basement. The difference in the orientation of the greatest principal horizontal stress is about 50°. |
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