The role of Pan-African structures in intraplate seismicity near the termination of the Romanche fracture zone,West Africa |
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| Institution: | 1. Institute of Wave and Information, Xi''an Jiaotong University, 710049 Xi''an, China;2. National Engineering Laboratory for Offshore Oil Exploration, 710049 Xi''an, China;3. Xi’an Research Institute of China Coal Technology & Engineering Group Corp, 710077 Xi’an, China;1. Institut de Physique du Globe de Strasbourg, UMR 7516, University of Strasbourg/EOST, CNRS, 1 rue Blessig, F-67084 Strasbourg, France;2. Department of Lithospheric Research, Czech Geological Survey, Klárov 3, 118 21 Praha 1, Czech Republic;3. Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;4. University of Chinese Academy of Sciences, Beijing 10069, China;5. Géosciences Montpellier, UMR 5243, University of Montpellier, CNRS, Place E. Bataillon, F-34095 Montpellier, France;6. Institute of Geophysics, Academy of Sciences of the Czech Republic, Bǒcní II/1401, 14131 Praha 4, Czech Republic;7. Institute of Geological Sciences, Polish Academy of Sciences, Senacka 1, 31-002 Kraków, Poland;1. Centro de Investigaciones de la Geósfera y Biósfera (CIGEOBIO), Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina;2. Departamento de Geofísica y Astronomía, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Argentina;3. Departamento de Informática, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Argentina |
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| Abstract: | The distribution of epicenters of both historic earthquakes and recent seismic events in southeastern Ghana, compiled from local and teleseismic networks, show strong correlation with the Pan-African structures onshore and indicate an alignment with disruptions on seismic sections offshore. The seismic reflection sections reveal basement structures of the external zone of the Pan-African Dahomeyide orogen and these structures can be traced to offsets of shelf strata and seabottom reflectors, providing direct evidence, for the first time, for neotectonic activity that may be responsible for seismicity in the area. The deep structure of the external zone consists of moderately-dipping reflectors inferred to represent high-strain zones in the variably deformed margin of the West African craton. Taken together, the available data suggest that active tectonics in this intraplate environment may involve inversion of the Pan-African thrust structures but that this activity is apparently not related to reactivation of the nearby Romanche Fracture Zone. |
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