A powerful 7.7 magnitude earthquake struck in the Sea of Okhotsk off the east Russian coast early Tuesday, US monitors said, but no tsunami warning was immediately issued.
The quake occurred at 0259 GMT some 158 kilometers (100 miles) east-north-east of Poronaysk, Russia, at a comparatively deep 625 kilometers (390 miles) down, the US Geological Survey said in an initial report.
The Pacific Tsunami Warning Center said in a first and final bulletin that based on all available data a destructive tsunami was not expected.
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