- Japan earthquake: 7.7 magnitude quake triggers tsunami warning BBC
- Risk of ‘megaquake’ in Japan higher after powerful earthquake strikes Scientific American
- Tsunami warning issued as 7.4 magnitude earthquake strikes off Japanese coast, USGS says ABC Information – Breaking Information, Newest Information and Movies
- Japan warns of slightly increased risk of mega-quake after a 7.7-magnitude one AP Information
- Major 7.7-magnitude earthquake strikes off Japan, prompting tsunami alerts NBC Information
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