A tsunami has hit coastal areas of Russia’s Kuril Islands and Japan’s large northern island of Hokkaido after a powerful, 8.8-magnitude earthquake struck off the coast of Russia early Wednesday. Warnings are also in place for Alaska, Hawaii and other coasts south toward New Zealand.

The Japan Meteorological Agency said a tsunami as high as 40 centimeters (1.3 feet) had been detected in 16 locations as the waves moved south along the Pacific coast from Hokkaido to just northeast of Tokyo. Officials urged caution, saying that bigger waves could come later.

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