Chilean authorities on Sunday issued a red alert -- the most severe in their warning system -- that the Copahue Volcano, high in the Andes mountains on the border with Argentina, might be poised for a significant eruption. In a statement, Chile's Geological and Mining Service stressed that no mandatory evacuations have been ordered around the remote volcano, which lies about 280 kilometers southeast (175 miles) of Concepcion, though the closest roads to it are in Argentina. Even though the seismic activity suggests a minor eruption, the agency decided to raise the alert level because it could not rule out...