July 30 (UPI) -- Several warnings were downgraded on Wednesday in various areas that faced the threat of tsunamis after a magnitude 8.8 earthquake that struck near Russia late Tuesday. Tsunami warnings were downgraded to advisories in Japan except for northern Hokkaido island and the northern Tohoku region of Honshu main island on the Pacific Coast, said Japan's meteorological agency . Warnings were downgraded as well in New Zealand, Australia and the Philippines. Mexican officials said its