# Seismic activity in Japan

> Developing situation record from CLSTR: https://clstr.news/situations/20261101-seismic-activity-in-japan
> Updated: 2026-11-01T04:42:00.000Z. Sources: 4. Developments: 2.

In late October 2026, a magnitude 5.5 earthquake struck Chiba Prefecture near Asahi. The tremors were felt strongly in the Tokyo metropolitan area and surrounding prefectures, with the strongest shaking reaching an intensity of 5 on the Shindo scale in Yokoshibahikari. No tsunami threat was issued, and no immediate casualties or significant damage were reported.

On November 1, 2026, a smaller magnitude 3.6 earthquake occurred in western Aichi Prefecture at a depth of approximately 40 kilometers. This event reached a maximum intensity of 2 in Aichi, Gifu, and Nagano prefectures, and an intensity of 1 in Shizuoka. No tsunami threat was identified following this activity.

## Timeline

### 2026-11-01: Earthquake strikes western Aichi Prefecture, Japan

A magnitude 3.6 earthquake struck western Aichi Prefecture, Japan, on November 1, 2026, with no tsunami threat reported.

2 sources. https://clstr.news/cluster/earthquake-strikes-western-aichi-prefecture-japan

### 2026-10-28: Japan earthquake hits Chiba Prefecture with magnitude 5.5

A magnitude 5.5 earthquake struck Chiba Prefecture, Japan, on October 29, 2026. Tremors were felt in Tokyo, but no tsunami threat or casualties have been reported.

2 sources. https://clstr.news/cluster/japan-earthquake-hits-chiba-prefecture-with-magnitude-55

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Cite as: Seismic activity in Japan. CLSTR, https://clstr.news/situations/20261101-seismic-activity-in-japan