A tsunami warning in Japan is raising questions. Here’s how tsunamis form, why warnings change and what people far from the coast should know.

A three-meter (9.8-foot) tsunami warning was issued for Japan on Monday after a strong 7.4 magnitude earthquake struck off the northeastern coast, according to the Japan Meteorological Agency and the US Geological Survey.

Tokyo: A moderate earthquake measuring around 6.2 magnitude struck northern Japan early on Monday, though there have been no immediate reports of damage or injuries. The Japan Meteorological Agency confirmed that no tsunami warning or advisory was issued following the tremor.

TOKYO - Japan's weather agency on Wednesday downgraded a tsunami warning for islands of the southern Okinawa prefecture to a tsunami advisory, while still urging people there to stay away from coastal areas.

On July 29th, a Pacific Basin-wide tsunami alert was issued after an 8.8. earthquake off Russia, causing concern and some confusion across the globe. If you get an alert, during the middle of the night, or middle of the day, what does it mean and where can ...