Reported by JMA 3 days ago.
It is the 13th strongest of the 24 detections recorded within 20 km of this point since 9 March 2026. The last comparable one was on 29 August 2026.
What the source measured
JMA reported: 20260830091738
Nearby, since 9 March 2026
- September 2, 2026 · score 8 · 0.0 km
- September 1, 2026 · score 24 · 0.0 km
- August 31, 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 0 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) | 0 / 100 |
| Our confidence | 62% |
| Coordinates | 36.2000, 138.2500 |
| Timestamp | 2026-08-30T00:14:00.000Z |
| Source | https://www.jma.go.jp/bosai/quake/20260830091738_20260830091429_VXSE5k_1.json |
Score Breakdown
Technical Details
| Mag | 4 |
| MaxIntensity | 1 |
| AreaName | 浦河沖 |
| ContentType | 20260830091738 |
| 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 0/100, in Japan (Japan), based on data from jma. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.