- Japan Is Used to Earthquakes, but What About a Big One? The New York Times
- Tsunami Warning Alert – April 20, 2026 U.S. Embassy & Consulates in Japan (.gov)
- Tsunami advisory lifted after Japan earthquake but warnings for potential stronger quake issued CNN
- M7.7 quake jolts northeastern Japan, tsunami of 80 cm seen on Pacific coast Japan Wire by Kyodo News
- Earthquake sets off brief tsunami alert and a megaquake advisory in northern Japan AP News
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