The Seismotectonics of southeastern Tanzania: Implication for the propagation of the Eastern Branch of the East African Rift

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dc.contributor.authorMulibo G.D., and Nyblade A.A
dc.date.accessioned2021-04-20T14:16:21Z
dc.date.available2021-04-20T14:16:21Z
dc.date.issued2016-04-02
dc.description.abstractSeismicity patterns and focal mechanisms in southeastern Tanzania, determined from data recorded on temporary and permanent AfricaArray seismic stations, have been used to investigate the propagation direction of the Eastern branch of the East African Rift System southward from the Northern Tanzania Divergence Zone (NTDZ). Within the NTDZ, the rift zone is defined by three segments, the Eyasi segment to the west, the Manyara segment in the middle, and the Pangani segment to the east. Results show that most of the seismicity (~ 75%) extends to the south of the Manyara segment along the eastern margin of the Tanzania Craton, and at ~ 6–7° S latitude trends to the SE along the northern boundary of the Ruvuma microplate, connecting with a N–S zone of seismicity offshore southern Tanzania and Mozambique. A lesser amount of seismicity (~ 25%) is found extending from the SE corner of the Tanzania Craton at ~ 6–7° S latitude southwards towards Lake Nyasa. This finding supports a model of rift propagation via the Manyara segment to the southeast of the Tanzania Craton along the northern boundary of the Ruvuma microplate. However, given the limited duration of the seismic recordings used in this study, the possibility of another zone of extension developing to the south towards Lake Nyasa (Malawi) cannot be ruled out. Focal mechanisms along the boundary between the Victoria and the Ruvuma microplates and offshore southeastern Tanzania show a combination of normal and strike slip faulting indicating mainly extension with some sinistral motion, consistent with the mapped geologic faults and a clockwise rotation of the Ruvuma microplate.en_US
dc.description.sponsorshipThis study was funded by National Science Foundation grants OISE-0530062, EAR-0440032, EAR-0824781en_US
dc.identifier.citation6.4 Mulibo G.D., and Nyblade A.A., (2016). The Seismotectonics of southeastern Tanzania: Implication for the propagation of the Eastern Branch of the East African Rift, Tectonophysics, 674, 20-30, https://doi.org/10.1016/j.tecto.2016.02.009en_US
dc.identifier.doidoi.org/10.1016/j.tecto.2016.02.009.
dc.identifier.issn0040-1951
dc.identifier.urihttp://hdl.handle.net/20.500.11810/5643
dc.language.isoenen_US
dc.publisherWileyen_US
dc.subjectSeismicity Focal mechanisms Southeastern Tanzania Rift propagation Plate kinematic model East African Riften_US
dc.titleThe Seismotectonics of southeastern Tanzania: Implication for the propagation of the Eastern Branch of the East African Riften_US
dc.typeJournal Article, Peer Revieweden_US
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