Reported by JMA 3 days ago.
It is one of only 3 we have recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
JMA reported: 20260830002055
Nearby, since 15 March 2026
- August 29, 2026 · score 0 · 0.0 km
- March 15, 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 14 out of 100, at 62 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Earthquakes |
| Severity | Low |
| Calamity Score (ours) | 14 / 100 |
| Our confidence | 62% |
| Coordinates | 35.6000, 140.1200 |
| Timestamp | 2026-08-29T15:17:00.000Z |
| Source | https://www.jma.go.jp/bosai/quake/20260830002055_20260830001711_VXSE5k_1.json |
Score Breakdown
Technical Details
| Mag | 4.8 |
| MaxIntensity | 4 |
| AreaName | 千葉県東方沖 |
| ContentType | 20260830002055 |
| 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 in this area?
Calamity.live data shows a earthquake event with CalamityScore 14/100, in Japan (Japan), based on data from jma. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.