Floodland

Johannesburg - Residents of the Witwatersrand may in future experience more and bigger earthquakes due to water rising underground in mined-out basins.

It is unclear what will happen in reality, but the possibility exists that earthquakes will occur more regularly in Johannesburg and that some of them could register up to 5 on the Richter scale, said Olaf Goldbach, a geophysicist at the CSIR.

Also we covered this before:
Millions of litres of highly acidic mine water is rising up under Johannesburg and, if left unchecked, could spill out into its streets some 18 months from now, Parliament's water affairs
portfolio committee heard on Wednesday.

The acid water is currently about 600 metres below the city's surface, but is rising at a rate of between 0,6 and 0,9 metres a day,
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Now aside from going under, were going to do an impression of a washing machine while we're at it.

An earthquake hitting 5 on the Richter scale is not to be sneezed at, we'll see a lot of side effects from all the badly built townhouses. Gonna be fun.