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Japan revises Aichi quake's origin as experts assess Nankai risk

The panel found no signs of increased megathrust-earthquake risk, but its chairman stressed that this does not mean one cannot occur.

Channel: ANNnewsCH ·

JapanStory of November 10, 2026Trari Newsroom

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愛知の震度5強の地震「南海トラフ地震発生の可能性は高まっていない」専門家検討会(2026年11月9日)

The earthquake that shook Aichi Prefecture on November 8 originated in eastern Aichi, rather than western Shizuoka as initially reported, according to a revised assessment presented after a Japan Meteorological Agency expert meeting.

Japan's All-Nippon News Network channel ANNnewsCH, run by TV Asahi's news department, reports that the panel found no unusual changes indicating a heightened likelihood of a large earthquake along the Nankai Trough compared with normal conditions.

The distinction matters because the trough, off Japan's Pacific coast, is a major earthquake-producing plate boundary. Aichi, whose capital is Nagoya, lies in central Japan on the island of Honshu.

The November 8 earthquake produced shaking rated upper 5 on Japan's seismic intensity scale. That measures shaking at a particular location, not the earthquake's magnitude. At its regular monthly meeting on November 9, the panel reviewed that event alongside other seismic activity, including a magnitude-5.2 earthquake in Hyuganada on October 25. The report says the monitoring showed no exceptional changes at the plate boundaries under review.

Panel chairman Naoshi Hirata nevertheless cautioned against treating the conclusion as an all-clear. He said the assessment that this earthquake would not lead to a Nankai Trough earthquake did not mean such an earthquake would not happen.

Hirata urged people to maintain their everyday preparations, saying a major Nankai Trough earthquake could occur at any time.

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