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A 5.3 magnitude earthquake hit central South Africa on Tuesday, killing at least one man and trapping some miners underground, according to emergency services.
The U.S. Geological Survey said the tremor was centred in Orkney, a town around 120 km (70 miles) southwest of Johannesburg, an area with a high concentration of deep gold mines.
"One of the buildings collapsed on a man believed to be in his 30s ... by the time paramedics arrived there was nothing they could do for him," Werner Vermaak, spokesman for emergency service provider ER24, told local television.
"I have since been alerted to mines in the local area where they have received reports of various miners trapped," Vermaak added, without giving any figures.
Officials at AngloGold Ashanti, Harmony Gold, Gold Fields and Sibanye Gold said they had felt the tremors in their headquarters but had so far received no reports of anything untoward in their mines.
The area around Johannesburg is not prone to seismic activity but it is home to some of the deepest gold mines in the world. The quake is the largest in the southern Africa region since a 7.0 tremor in Zimbabwe in 2006.
Comment: If researchers would only pay attention to what is going in the planet, then they will realize that we are hardly on a "long-term global warming" phase as the article suggests.
For an explosion you need two things: an igniter and combustible material. The Arctic, as with many other places on Earth is outgassing methane at never-before-seen rates. Lightning discharge events are also increasing in intensity and frequency because the solar wind is being grounded while comet dust loading of the atmosphere increases nucleation and resistance, leading to greater precipitation and greater charge-rebalancing respectively.
These 'crater-holes' are not an indication of global warming. They're another indication of the planet opening up.
See Earth Changes and the Human Cosmic Connection: The Secret History of the World - Book 3 where this is explained in greater detail.