Japan issues 9.9 quake alert before panic and apology

Residents across Japan were thrown into chaos today after the Japan Meteorological Agency (JMA) issued a warning for a magnitude 9.9 earthquake—record-breaking and described as the most powerful in history ^[1]. The alert, sent at 12:40pm local time (4am UK time), claimed a superquake had struck the Kuril Islands at 12:36pm, with severe tremors expected in Hokkaido, Tohoku, and the Kanto region ^[2].

The warning was cancelled just eight minutes later, at 12:48pm, after the JMA confirmed the alert was a system error ^[1]. Seismic data revealed a magnitude 6.9 quake near the Kamchatka Peninsula at 12:39pm and a minor magnitude 1 tremor in Hakodate, Hokkaido—neither causing significant shaking or tsunami risk ^[2].

The JMA held a press conference at 2pm (6am UK time) to apologise, with Ayaki Kaito, head of the Earthquake Monitoring Division, stating: "We sincerely apologise for the inconvenience caused to the public" ^[1]. The agency confirmed the automated system had misjudged the magnitude, though the exact cause remains under investigation ^[2].

Japan’s early warning system is designed to activate for quakes of magnitude 5 or higher, but this incident exposed vulnerabilities in real-time data interpretation ^[1]. The last known magnitude 9.5 quake occurred in Valdivia, Chile, in 1960—killing over 1,600 and triggering a tsunami that reached Japan ^[2].

The false alarm has reignited debate over the reliability of automated disaster alerts, particularly in a nation with a high seismic risk. Officials stress that no damage occurred, but the psychological impact on residents remains a concern. The story was first reported by Mirror and Daily Star.