The aftershocks are already coming. Authorities confirm that a magnitude-8.1 quake, the strongest to hit the country since 1985, struck off the Pacific coast of Chiapas state, killing at least 58 people. Shaking could be felt in Mexico City, more than 1,000 miles away. A series of magnitude-6 aftershocks have been reported, as residents evacuated en masse. Now not only Mexico but Fiji, Guatemala, Ecuador and El Salvador are under tsunami warnings, and schools have been closed across the region as local authorities work to assess the damage.