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• W3094775426 endingPage "104051" @default.
• W3094775426 startingPage "104051" @default.
• W3094775426 abstract "New MW–ML magnitude relations valid for the periods January 1971–March 1997, April 1997–September 2012 and October 2012–present are presented for South Africa. Three MW–ML relations were derived for the respective periods by applying a general orthogonal regression using 85 mining-related and tectonic events. Moment magnitudes (MW) were calculated using spectral analysis of the vertical component seismograms. A Brune model for source radiation was assumed. Attenuation functions previously derived from local seismic events were used. For each event, the final MW was computed by taking the average of the values determined at four or more stations. These MW values were used to compute new MW –ML regression equations for three previous ML relations that had been used to compile the South African earthquake catalogue. The new MW–ML relations were then compared with the MW determined from the Harvard Centroid Moment Tensor (CMT) project. The MW computed using the relation derived for the most recent period (October 2012–present) produces MW values that are similar to those reported by the Harvard CMT solutions. The relations can be used in the homogenization of the South African earthquake catalogue. Application of the new relations for the three periods will reduce uncertainty in the homogenized catalogues, which are important when calculating seismic hazard parameters (i.e. when estimating activity rates, b-values and Mmax)." @default.
• W3094775426 created "2020-11-09" @default.
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• W3094775426 date "2021-01-01" @default.
• W3094775426 modified "2023-09-23" @default.
• W3094775426 title "Towards a homogeneous moment magnitude determination for earthquakes in South Africa: Reduction of associated uncertainties" @default.
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• W3094775426 doi "https://doi.org/10.1016/j.jafrearsci.2020.104051" @default.
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