Reported by JMA today.
It is the 5th strongest of the 33 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
JMA reported: 20260903055655
An estimated 1,099,270 people live within 15 km of this point.
This is the highest magnitude we have recorded at this point, over 67 readings since 31 August 2026 — the previous range was 3.1 to 3.2.
Nearby, since 12 March 2026
- September 2, 2026 · score 30 · 0.0 km
- August 28, 2026 · score 0 · 0.0 km
- August 27, 2026 · score 0 · 0.0 km
How we know
One source: JMA. Not yet confirmed by a second, independent source.
Our own score for this event is 30 out of 100, at 82 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Earthquakes |
| Severity | Low |
| Calamity Score (ours) | 30 / 100 |
| Our confidence | 82% |
| Coordinates | 32.7900, 130.7400 |
| Nearest City | Kotō (1 km) |
| Population Exposed | 1.1M within 15 km |
| Impact Tier | minor |
| Timestamp | 2026-09-02T20:54:00.000Z |
| Source | https://www.jma.go.jp/bosai/quake/20260903055655_20260903055410_VXSE5k_1.json |
Score Breakdown
Technical Details
| Mag | 3.2 |
| MaxIntensity | 2 |
| AreaName | 熊本県天草・芦北地方 |
| ContentType | 20260903055655 |
| Serial | 1 |
Safety Information
If you feel shaking: Drop, Cover, and Hold On. Move away from windows, heavy objects, and exterior walls. After shaking stops, check for injuries and structural damage. Be prepared for aftershocks, which can occur minutes to months after the mainshock. Follow instructions from local emergency management authorities.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens near Kotō?
Calamity.live data shows a earthquake event with CalamityScore 30/100, near Kotō (Japan), based on data from jma. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.