A magnitude-7.8 earthquake struck on Ecuador’s coast Saturday, leaving at least 77 people dead and causing buildings to shake in cities more than 100 miles away and collapsing an overpass, authorities and witnesses said.The temblor struck just before 7 p.m. local time (8 p.m. ET) with an epicenter 16 miles south-southeast of the coastal town of Muisne, located on the country’s northwestern coast, the U.S. National Geological Survey said. The quake was recorded at a depth of about 12 miles.The office of President Rafael Correa said early Sunday that the death toll had risen to 77, and 588 were injured. Correa earlier declared a national emergency.”Our infinite love to the families of the dead,” Correa said on Twitter, while cutting short a trip to Italy to return home.The country’s Geophysics Institute in a bulletin described “considerable damage” in the area of the epicenter and in Guayaquil. Vice President Jorge Glas said 10,000 military troops and 3,500 police have been dispatched to the affected areas.