A 6.4-magnitude earthquake struck Monday in the New Ireland Region of Paupua New Guinea, seismologists said. The epicenter of the 31-mile-deep earthquake was about 137 miles west-northwest of Arawa on the southeast coast of Bougainville Island in Paupua New Guinea, and 508 miles west-northwest of Honiara in the Solomon Islands. The reading on the earthquake\'s magnitude came from the U.S. Geological Survey said. There were no initial reports of damages. A tsunami warning was not posted.