New York, June 8 :An earthquake with a magnitude of 5.6 jolted Rat Islands, Aleutian Islands, Alaska, at 20:31:45 GMT Thursday, the U.S. Geological Survey said.The epicenter, with a depth of 5.345 km, was initially determined to be at 52.0714 degrees north latitude and 177.8082 degrees east longitude.(UNI)