Right now
The most recent data we hold from JMA arrived 7 hours ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
Reported by JMA today.
No stronger detection stands among the 5 recorded within 20 km of this point since 15 March 2026 — one other scored the same. The last comparable one was on 6 September 2026. 3 more were recorded here in the fortnight before it.
What the source measured
JMA reported: 20260912165219
An estimated 1,184,350 people live within 15 km of this point.
This is the lowest magnitude we have recorded at this point, over 80 readings since 12 September 2026 — the previous range was 3.2 to 3.3.
Nearby, since 15 March 2026
- September 6, 2026 · score 30 · 0.0 km
- August 29, 2026 · score 14 · 0.0 km
- August 29, 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 | 35.6000, 140.1200 |
| Nearest City | Chiba (0 km) |
| Population Exposed | 1.2M within 15 km |
| Impact Tier | minor |
| Timestamp | 2026-09-12T07:49:00.000Z |
| Source | https://www.jma.go.jp/bosai/quake/20260912165219_20260912164944_VXSE5k_1.json |
Score Breakdown
Technical Details
| Mag | 3.2 |
| MaxIntensity | 1 |
| AreaName | 千葉県南部 |
| ContentType | 20260912165219 |
| 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.
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