Stress field in the central and northern parts of the Gulf of Suez area,Egypt from earthquake fault plane solutions |
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| Institution: | 1. Paleomagnetic Laboratory Fort Hoofddijk, Department of Earth Sciences, Utrecht University, Budapestlaan 17, 3584, CD, Utrecht, The Netherlands;2. Ludwig-Maximilians-University, Munich, Department of Earth and Environmental Sciences, Geophysics, Theresienstr 41, 80333 Munich, Germany;3. Earth Dynamics Research Group, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS), The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, GPO Box U1987, WA 6845, Australia;4. Ludwig-Maximilians-University, Munich, Department of Earth and Environmental Sciences, Paleontology and Geobiology, Richard-Wagner-Str. 10, 80333 Munich, Germany;5. Bavarian Environmental Agency, Hans-Högn-Str. 12, 95030 Hof, Saale, Germany;6. Bavarian Environmental Agency, Haunstetter Str. 1 12, 86161 Augsburg, Germany;1. Fault Analysis Group, School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland;2. Department of Geological Sciences, University of Canterbury, Private bag 4800, Christchurch, New Zealand;1. Department of Earth Sciences, Freie Universität Berlin, Malteserstrasse 74-100, 12249 Berlin, Germany;2. Geologische Bundesanstalt, Neulinggasse 38, 1030 Wien, Austria |
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| Abstract: | Earthquake focal mechanism solutions from 18 events in the central and northern parts of the Gulf of Suez with local magnitudes ranging from 2.8 to 5.2 and occurring between 1983 and 2004 are used to determine the type of motion and stress pattern of the region. Fault plane solutions show mostly normal component; pure normal faulting mechanisms and normal faulting with a strike-slip component. Only some mechanisms show pure strike-slip faulting. The fault planes strike in NW, WNW, NNE and ENE directions, in conformity with the geologically observed striking faults in the northern and central parts of the gulf. The principal stress orientation is also estimated by inverting the selected focal mechanism solutions. The results show that the northern part of the Gulf is subjected to NE–SW to NNE–SSW extension, with a horizontal σ3 (plunge 3°) and subvertical σ1 (plunge 80°). This means that the horizontal extensional stresses are still present in the central/northern Gulf of Suez. |
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