Seismic monitoring in South Africa prior to 1970 was through sporadic deployment of seismographs by various institutions. The first was a Wiechert seismograph installed at Union Observatory in Johannesburg in 1910 to monitor mining-related earthquakes (Gane 1939). Table 1, after Wright and Fernández (2003), shows in brief the monitoring status in South Africa for the period 1910 to 1981. Following the devastating magnitude 6.3 earthquake in Western Cape Province during September 1969, the Geological Survey (now the Council for Geoscience) deployed seven seismographs in South Africa and heralded the start of organized seismic monitoring in the country...
Research Article|March 01, 2008
The South African National Seismograph Network
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Ian Saunders, Martin Brandt, Johan Steyn, Dale Roblin, Andrzej Kijko; The South African National Seismograph Network. Seismological Research Letters ; 79 (2): 203–210. doi: https://doi.org/10.1785/gssrl.79.2.203
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