Reported by JMA 170 days ago.
It is one of only 2 we have recorded within 20 km of this point since 15 March 2026.
What the source measured
JMA reported: 20260315141046
Nearby, since 15 March 2026
- August 29, 2026 · score 0 · 0.0 km
How we know
Confirmed by 3 independent sources, including JMA.
Our own score for this event is 4 out of 100, at 71 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Earthquake |
| Severity | low |
| Calamity Score (ours) | 4 / 100 |
| Our confidence | 71% |
| Coordinates | 36.3900, 139.0600 |
| Timestamp | 2026-03-15T05:06:00.000Z |
| Source | https://www.jma.go.jp/bosai/quake/20260315141046_20260315140618_VXSE5k_1.json |
Score Breakdown
Technical Details
| Mag | 4.4 |
| MaxIntensity | 3 |
| AreaName | 群馬県南部 |
| ContentType | 20260315141046 |
| Serial | 1 |
| Usgs Mag | 4.8 |
| Usgs Depth | 94.9 |
| Usgs Tsunami | false |
| Usgs Felt | 7 |
| Usgs Sig | 357 |
| Emsc Mag | 4.8 |
| Emsc Depth | -94.9 |
| Emsc MagType | mb |
| Emsc Region | EASTERN HONSHU, JAPAN |
| Emsc Auth | NEIC |
| Emsc SourceId | 1960751 |
| MergedSources | [{"id":"usgs_us6000sgeb","source":"usgs","severity":"low","severityValue":28.799999999999997,"timestamp":1773551166727,"latitude":36.3919,"longitude":139.3214},{"id":"emsc_20260315_0000077","source":"emsc","severity":"low","severityValue":28.799999999999997,"timestamp":1773551166727,"latitude":36.3919,"longitude":139.3214}] |
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 10 February 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 4/100, in Japan (Japan), based on data from jma. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.