JOHANNESBURG, South Africa (AP) - An earthquake shook parts of northern South Africa on Wednesday, trapping 42 miners underground, damaging buildings and causing scores of minor injuries, officials and news media said. The quake, with a preliminary magnitude of 5, was centered near Klerksdorp, 125 miles southwest of Johannesburg, said Ian Saunders of the National Seismograph Network at the Department of Geosciences in Pretoria. The temblor trapped the workers 1 1/2 miles underground at a gold mine, the South African Press Association reported. "Rescue teams are working to open entry tunnels that were closed by rock falls," Ilja Graulich, a...