SANTIAGO, Chile -- The U.S. Geological Survey says a magnitude-6.5 earthquake has struck off the coast of Chile. The quake was recorded at 5:49 a.m. local time (EDT; 0949 GMT) Monday, at a shallow depth of 10 kilometers (6.2 miles), some 600 kilometers (370 miles) from the city of Puerto Quellon. No tsunami warning was issued. Chile's naval seismology office says it was not felt on land. U.S. seismologists originally estimated the magnitude at 6.8.