Japan cancels wide-area strong earthquake alert after overestimating magnitude
Japan's weather agency withdrew a strong-shaking warning issued for a broad region from Hokkaido to Tokai after realizing it had overstated the quake’s size.
At approximately 12:40 p.m., the Japan Meteorological Agency issued a warning for a massive earthquake, citing a magnitude-9.9 event near the Chishima (Kuril) Islands and predicting intensity-7 shaking from Hokkaido down to the Tokai region. Later measurements revealed the quake’s actual impact was minimal, with many locations reporting only intensity-1. Acknowledging the error, the agency cancelled the warning and said it would investigate the cause of the over-estimate.
The alert prompted a temporary suspension of bullet-train operations on the Tokaido Shinkansen line between Shin-Yokohama and Toyohashi, but services have already been restored. This incident highlights challenges in real-time seismic assessment and its effects on transportation.
Why it matters
It shows how inaccurate earthquake alerts can disrupt transport and underscores the need for reliable seismic monitoring.
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