A magnitude 7.4 earthquake struck off Russia's Kamchatka Peninsula on Saturday, with the Japan Meteorological Agency saying slight changes in sea levels around the archipelago could occur but damage in the country was unlikely.The quake occurred at 2:37 p.m. about 111 kilometers east of Petropavlovsk-Kamchatsky at a depth of 39.5 km, according to the U.S. Geological Survey.A tsunami threat was issued near the east coast of Kamchatka, according to the USGS.The Kamchatka Peninsula in the Russian Far East was also jolted by an M8.8 quake on July 30, triggering tsunami waves along vast stretche…READ FULL ARTICLE