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<title lang=en>Contrasted seismogenic and rheological behaviours from shallow and deep earthquake sequences in the North Tanzanian divergence, East Africa</title>
<creator>Albaric, J.</creator>
<creator>Perrot, Julie</creator>
<creator>Déverchère, Jacques</creator>
<creator>Deschamps, Anne</creator>
<creator>Le Gall, B.</creator>
<creator>Ferdinand, R.W.</creator>
<creator>Petit, C.</creator>
<creator>Tiberi, C.</creator>
<creator>Sue, Christian</creator>
<creator>Songo, M.</creator>
<contributor>Université européenne de Bretagne (UEB)</contributor>
<contributor>Domaines Océaniques (LDO) ; Institut national des sciences de l'Univers (INSU - CNRS) - Université de Brest (UBO) - Observatoire des Sciences de l'Univers - Institut d'écologie et environnement - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géoazur (GEOAZUR) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire de la Côte d'Azur - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>University of Dar Es salaam, Geology Department ; University of Dar es Salaam (UDSM)</contributor>
<contributor>Université Pierre et Marie Curie - Paris 6 (UPMC)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0899-5362</source>
<source>Journal of African Earth Sciences</source>
<publisher>Elsevier</publisher>
<identifier>hal-00420599</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00420599</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00420599</source>
<source>Journal of African Earth Sciences, Elsevier, 2010, 58 (5), pp.799-811. 〈10.1016/j.jafrearsci.2009.09.005〉</source>
<identifier>DOI : 10.1016/j.jafrearsci.2009.09.005</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jafrearsci.2009.09.005</relation>
<language>en</language>
<subject>[SDU.STU] Sciences of the Universe [physics]/Earth Sciences</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>We report preliminary results of a seismological experiment, SEISMOTANZ'07, which consisted in the deployment of a local network (35 stations) in the East African Rift System (EARS), North Tanzania, during 6 months in 2007. We compare two earthquake sequences (Gelai and Manyara) occurring respectively in the southern end of the Kenya rift and in the North Tanzanian Divergence (NTD). Only distant of 150 km, their triggering mechanisms are different. None of the sequences depicts typical swarm or mainshock-aftershock patterns. They highlight the change in the magmatic/tectonic nature of the rift where the eastern branch of the EARS enters the Tanzanian craton. The similar shape and long-axis of the elongate sequences emphasize the preferred locus of active strain release along NE-SW discontinuities which probably root at depth into steep Proterozoic shear zones. At Gelai, the deformation is dominated by aseismic process involving slow slip on normal fault and dyke intrusion within the upper crust Calais_et_al_2008. The spatial and temporal earthquake distribution indicates a possible correlation between the Gelai crisis and the eruption of the nearby Oldoinyo Lengai volcano. At Manyara, the sequence is more uncommon, revealing a long-lasting seismic activity deepely rooted (20-35 km depth) possibly related to stress loading transmitted laterally. The yield stress envelope modelled from the depth frequency distribution of earthquakes in the NTD is consistent with the presence of a mafic lower crust and further supports the strength increase of the rifted crust from south Kenya to the NTD.</description>
<date>2010-12</date>
</dc>
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