A 7.4-magnitude quake shook the southern Atlantic Ocean early Friday, the US Geological Survey said, with an epicenter 195 miles (316 kilometers) from islands hosting British Antarctic research stations. There was no immediate tsunami warning following the quake. The USGS reported at least five aftershocks. The quake struck at 5:32 am local time (0732 GMT) at a depth of 10 kilometers. It was centered east-southeast of the remote British-administered South Georgia and South Sandwich Islands, […]