AFRICAN MIRROR REPORTER A major earthquake, which registered  6.1 on the Richter scale struck offshore from South Africa, releasing energy equivalent to 1.9 atomic bombs, experts said. The earthquake took place 1600 km from Cape Town coast, at the depth of 10km, sparking fears of a tsunami. There were, however, no immediate reports of casualties or damage.  Some residents of the southern city of Cape Town took to social media and the internet to share their experience of the tremor, which the USGS said occurred at 19h10, South African time. "Guys, we just felt a tremor in Cape Town. Our…