# Seismic activity in Japan

> Live situation record from CLSTR: https://clstr.news/situations/20260928-seismic-activity-in-japan
> Updated: 2026-09-28T01:52:00.000Z. Sources: 4. Developments: 2.

In late September 2026, several earthquakes were recorded across different regions of Japan.

On September 22, a magnitude 4.5 earthquake occurred off the coast of Fukushima Prefecture at a depth of approximately 30km. Shaking was felt in Fukushima and Miyagi Prefectures, reaching a maximum intensity of 1 on the Japanese seismic scale. No tsunami threat was reported.

One week later, additional seismic activity was recorded. On September 28, a magnitude 3.5 earthquake struck off the coast of Miyagi Prefecture at a depth of 50km, with a maximum intensity of 1 in Iwate and Miyagi. This was followed on September 29 by a magnitude 4.9 earthquake in southern Ibaraki Prefecture at a depth of 50km. This second event produced a maximum intensity of 4 in several locations within Ibaraki and Saitama Prefectures, with tremors felt as far as Tokyo and Kanagawa. No tsunami was expected from these later events.

## Timeline

### 2026-09-28: Japan experiences earthquakes in Ibaraki and Miyagi prefectures

A series of earthquakes struck Japan, including a magnitude 4.9 quake in Ibaraki and Saitama that reached intensity 4, and a magnitude 3.5 quake off the coast of Miyagi Prefecture.

4 sources. https://clstr.news/cluster/japan-experiences-earthquakes-in-ibaraki-and-miyagi-prefectures

### 2026-09-21: Earthquake strikes off the coast of Fukushima, Japan

A magnitude 4.5 earthquake struck off the coast of Fukushima, Japan, on September 22, 2026, causing maximum seismic intensity 1 in parts of Fukushima and Miyagi Prefectures. No tsunami was expected.

2 sources. https://clstr.news/cluster/earthquake-strikes-off-the-coast-of-fukushima-japan

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Cite as: Seismic activity in Japan. CLSTR, https://clstr.news/situations/20260928-seismic-activity-in-japan