Japan’s mega-quake that never was, and the danger of false alarms
Por Julian Ryall — South China Morning Post – News feed
Advertisement Japan Asia East Asia Japan’s mega-quake that never was, and the danger of false alarms
A software error triggering a false magnitude 9.9 quake in Japan sparks fears that eroding public trust could cost lives in a real quake
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Julian Ryall in Tokyo Published: 7:28pm, 19 Oct 2026 Updated: 7:38pm, 19 Oct 2026
Kanako Hosomura was working in a clothing store in Yokohama when an alert on her phone warned of an imminent magnitude 9.9 earthquake.
“We all rushed outside,” Hosomura said, recalling how people poured out of nearby shops and offices to watch tall buildings and power lines for signs of shaking.
But no earthquake came. Eight minutes after issuing the warning on Friday, the Japan Meteorological Agency (JMA) cancelled the alert, leaving residents to wonder what had gone wrong.
“These alarms do not go off very often – only maybe a couple of times a year – so when they do sound, everyone is worried that the quake is going to be really big,” Hosomura said.
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