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Authors: Strasser, F. O.* 
Albini, Paola* 
Flint, N. S.* 
Beauval, C.* 
Title: Twentieth century seismicity of the Koffiefontein region (Free State, South Africa): consistent determination of earthquake catalogue parameters from mixed data types
Journal: Journal of Seismology 
Series/Report no.: /19 (2015)
Issue Date: 2015
DOI: 10.1007/s10950-015-9503-2
Abstract: The preparation of earthquake catalogues for seismic hazard analysis requires the use of uniform parameters, in particular for magnitudes, although the original data include a variety of formats, such as macroseismic intensities and various instrumental mag- nitude scales. In regions of low seismicity, such as South Africa, data are generally sparse and not always suffi- cient to develop locally calibrated conversion relations. They can nevertheless be used to test the applicability of imported conversion relations, as well as their consis- tency. The Koffiefontein region of South Africa pro- vides a good test case in view of its somewhat higher level of seismicity, and central geographic location with- in the country. This paper reviews determinations of location and magnitude parameters for a suite of moderate-to-large earthquakes that have occurred in this region between 1903 and 1985.
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