Powerful 7.7 quake strikes off east Russian coast: USGS
The quake occurred at 0259 GMT some 158 kilometers east of Poronaysk, Russia, with the epicenter a comparatively deep 625 kilometers down, the US Geological Survey said in an initial report.
Japan's Meteorological agency said the tremor was felt throughout the country's northern island of Hokkaido, but the Pacific Tsunami Warning Center said in a first and final bulletin that a destructive tsunami was not expected.
The earthquake caused a jolt in the Japanese capital Tokyo, AFP journalists said.
The area around Japan is regularly hit by powerful quakes and is the site of the convergence of several of the Earth's tectonic plates.