Reported by JMA 4 days ago.
It is the 10th strongest of the 13 detections recorded within 20 km of this point since 8 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
JMA reported: 20260829081443
Nearby, since 8 March 2026
- March 8, 2026 · score 30 · 0.0 km
- March 26, 2026 · score 32 · 12.5 km
- June 10, 2026 · score 4 · 14.0 km
How we know
Confirmed by 3 independent sources, including JMA.
Our own score for this event is 6 out of 100, at 71 % 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) | 6 / 100 |
| Our confidence | 71% |
| Coordinates | 39.5000, 143.5000 |
| Timestamp | 2026-08-28T23:10:00.000Z |
| Source | https://www.jma.go.jp/bosai/quake/20260829081443_20260829081037_VXSE5k_1.json |
Score Breakdown
Technical Details
| Mag | 4.7 |
| MaxIntensity | 1 |
| AreaName | 三陸沖 |
| ContentType | 20260829081443 |
| Serial | 1 |
| Usgs Mag | 4.8 |
| Usgs Depth | 34.93 |
| Usgs Tsunami | false |
| Usgs Sig | 354 |
| Emsc Mag | 4.8 |
| Emsc Depth | -10 |
| Emsc MagType | mw |
| Emsc Region | OFF EAST COAST OF HONSHU, JAPAN |
| Emsc Auth | EMSC |
| Emsc SourceId | 2052630 |
| MergedSources | [{"id":"usgs_us7000tcqg","source":"usgs","severity":"low","severityValue":28.799999999999997,"timestamp":1787958636399,"latitude":39.6554,"longitude":143.2337},{"id":"emsc_20260828_0000319","source":"emsc","severity":"low","severityValue":28.799999999999997,"timestamp":1787958632930,"latitude":39.6546,"longitude":143.1552}] |
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 6/100, in Japan (Japan), based on data from jma. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.