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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5497

Title: First-order regional seismotectonic model for South Africa
Authors: Singh, M
Kijko, A
Durrheim, R
Keywords: Seismotectonic models
Seismicity
Zonation
South African seismotectonic model
Regional seismotectonic models
Natural hazards
Issue Date: Oct-2011
Publisher: Springer
Citation: Singh, M, Kijko, A and Durrheim, R. 2011. First-order regional seismotectonic model for South Africa. Natural Hazards, Vol 59(1), pp 383-400
Series/Report no.: Workflow request;7864
Abstract: A first-order seismotectonic model was created for South Africa. This was done using four logical steps: geoscientific data collection, characterisation, assimilation and zonation. Through the definition of subunits of concentrations of earthquake foci and large neotectonic and structural domains, seismotectonic structures, systems and domains were created. Relatively larger controls of seismicity exist between the Great Escarpment and the coast. In the south, this region is characterised by large aeromagnetic anomalies and large EW trending faults. In the west, it is characterised by the NW–SE trending Wegener stress anomaly, radial-trending dykes and earthquake clusters. In the east, it is characterised by a large neotectonic domain where several large historical earthquakes occurred. In the centre of South Africa, several clusters of earthquake activity are found, often related to mining activity. Further north, seismicity is related to both mining activity and neotectonic deformation. This work contributes to the development of a seismotectonic model for South Africa by (1) bringing together, digitally, several data sets in a common GIS platform (geology, geophysics, stress, seismicity, neotectonics,topography, crustal and mantle structure and anisotropy), (2) understanding the significance of data sets for seismotectonic zonation and limitations thereof and (3) obtaining a reasonable regional model for use in seismic hazard assessments.
Description: Copyright: 2011 Springer. This is the post print version of the work. The definitive version is published in Natural Hazards, Vol 59(1), pp 383-400
URI: http://www.ingentaconnect.com/content/klu/nhaz/2011/00000059/00000001/00009762
http://hdl.handle.net/10204/5497
ISSN: 0921-030X
Appears in Collections:Mining and geoscience
General science, engineering & technology

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