Seismologists say a magnitude-7.1 earthquake has shaken southernmost Mexico. Local media say the quake was felt strongly across much of southern Mexico, but there are no immediate reports of injury. In Mexico City, buildings and light posts swayed and local news media reported the quake was felt strongly in the Mexican states of Chiapas and Tabasco. There were no immediate reports of damage or injuries, though there were power failures in the western part of Guatemala. The quake was centered 57 miles below the surface, and 22 miles west-southwest of Tapachula on the Pacific coast. (More earthquake stories.)