A 7.0-magnitude earthquake struck Saturday off the coast of Antarctica, with authorities issuing a tsunami warning for Chile's Eduardo Frei base on the frigid continent, emergency officials said. The quake struck at 8:36 pm (2336 GMT) about 210 kilometers (130 miles) east of the base at a depth of 10 kilometers (6 miles), Chile's National Emergency Office (Onemi) said, urging