Earthquake sets off brief tsunami alert and a megaquake advisory in northern Japan CTV NewsJapan earthquake: 7.7 magnitude quake triggers tsunami warning BBCJapan lifts tsunami alert after magnitude 7.7 quake Al JazeeraM7.5 quake hits off northeastern Japan, triggering tsunami waves Japan TodayJapan tsunami alerts downgraded following powerful earthquake off northern coast – as it happened The Guardian
