Reported by USGS 168 days ago.
It is the 6th strongest of the 8 detections recorded within 20 km of this point since 9 March 2026. The last comparable one was on 9 March 2026. One more was recorded here in the fortnight before it.
What the source measured
USGS reported: 281 km WNW of Houma, Tonga
USGS recorded magnitude 4.2 at a depth of 539 km.
Nearby, since 9 March 2026
- June 2, 2026 · score 15 · 6.8 km
- June 18, 2026 · score 5 · 10.5 km
- June 18, 2026 · score 7 · 11.9 km
How we know
Confirmed by 2 independent sources, including USGS.
Our own score for this event is 2 out of 100, at 67 % 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) | 2 / 100 |
| Our confidence | 67% |
| Coordinates | -19.9939, -177.6958 |
| Timestamp | 2026-03-17T02:13:21.462Z |
| Source | https://earthquake.usgs.gov/earthquakes/eventpage/us6000sgra |
Score Breakdown
Technical Details
| Mag | 4.2 |
| Depth | 538.56 |
| Tsunami | false |
| Sig | 271 |
| Emsc Mag | 4.2 |
| Emsc Depth | -537.9 |
| Emsc MagType | mb |
| Emsc Region | FIJI REGION |
| Emsc Auth | EMSC |
| Emsc SourceId | 1961770 |
| MergedSources | [{"id":"emsc_20260317_0000029","source":"emsc","severity":"low","severityValue":25.200000000000003,"timestamp":1773713601210,"latitude":-20.0551,"longitude":-177.5787}] |
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 near Tonga?
Calamity.live data shows a earthquake event with CalamityScore 2/100, 281 km WNW of Houma, Tonga (Tonga), based on data from usgs. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.