Tsunami threat is over after three earthquakes, one with a 7.4 magnitude, hit Petropavlovsk-Kamchatsky, the capital of Kamchatka region in Russia.There were also seismic events with magnitudes

S everal earthquakes, including a 7.4 magnitude one, struck off the Russian coast on Sunday, according to the U.S. Geological Survey, prompting brief warnings of potential tsunami waves on the nearby peninsula and farther across the Pacific in Hawaii.