An earthquake with a magnitude of 7.7 struck off the eastern coast of Russia, causing authorities to warn of a tsunami threat in parts of the Pacific. <br/><br/>The Pacific Tsunami Warning Center said, waves were forecast to be less than one foot above the tide level for coasts in an area ranging from Russia to Hawaii. <br/><br/>The United States Geological Survey said, the quake at 23:34 GMT hit 199 kilometres east-southeast of Nikol'skyoe, Russia. The quake struck at a depth of 11.7 kilometres.