An earthquake with a preliminary magnitude of 7.8 struck east of the Kamchatka Peninsula in Russia's Far East on Friday, the U.S. Geological Survey said, with the Japanese weather agency signaling the possibility of tsunami in the Pacific Ocean.The quake, which occurred at 6:58 a.m. local time, could cause some changes to the surface of the water along the Japanese coast, but otherwise no damage is expected, the Japan Meteorological Agency said.READ FULL ARTICLE