
April 20, 2026 -On Monday, at 4:53 P.M. local time, a magnitude 7.7 earthquake struck off the northeastern shores of Japan’s largest island, Honshu, where the Pacific tectonic plate plunges beneath the North American plate at the deep-sea Japan Trench. Immediately, the Japan Meteorological Agency (JMA) sent out a tsunami warning alert. Although small tsunami waves did soon reach various sections of the coast, no reports of injuries, deaths, or significant damage to homes or infrastructure were reported.
The danger, however, has not necessarily passed. Following the temblor, a JMA spokesperson told the media and those along the affected shoreline that “the likelihood of a new, huge earthquake occurring is relatively higher than during normal times.” Specifically, there is an elevated risk of a “megaquake”—one of magnitude 8.0 or greater—in the coming days.