An earthquake with a preliminary magnitude of 7.4 struck off the southern Philippine island of Mindanao on Friday, the U.S. Geological Survey said.The Philippine seismological agency issued a tsunami warning following the quake. The temblor occurred around 9:45 a.m. at a depth of about 58 kilometers, according to the USGS.The quake followed a magnitude 6.9 temblor on Sept. 30 off the Southeast Asian country's island province of Cebu that left 72 people dead.Coastal areas of Japan could experience changes in sea level but there was no tsunami threat, the Japan Meteorological Agency said.READ FULL ARTICLE