Subsequent earthquake advisory issued after M7.4 event, elevated large-earthquake risk, Japan

Japan Meteorological Agency (JMA) issued an official advisory warning of an elevated risk of a larger earthquake along its Pacific coast on April 20, 2026, after a M7.4 quake near the Japan Trench at 07:53 UTC (16:53 local time). The agency estimates about a 1% chance of a Mw7.8 or greater earthquake occurring within seven days, based on historical statistics. Source