4.2-magnitude earth tremor in Gauteng

Some may have thought that everyone in the country was jumping up and down celebrating Tatjana Schoenmaker’s gold that literally caused a seismic rattle across Gauteng. It was in fact a 4.2 magnitude tremor that struck about two hours after Tatjana’s win. It’s not the first and it’s not the strongest but is it cause to worry? 

We asked geologist Dr Gideon Groenewald.