Reported by USGS today.
What the source measured
USGS reported: 117 km WNW of Pangai, Tonga
USGS recorded magnitude 4.9 at a depth of 198 km.
This is the lowest magnitude we have recorded at this point, over 25 readings since 1 September 2026 — the previous range was 4.9 to 5.
How we know
Confirmed by 2 independent sources, including USGS.
Our own score for this event is 8 out of 100, at 68 % 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) | 8 / 100 |
| Our confidence | 68% |
| Coordinates | -19.4439, -175.4039 |
| Nearest City | Nuku‘alofa (190 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-01T10:34:48.848Z |
| Source | https://earthquake.usgs.gov/earthquakes/eventpage/us7000tdbc |
Score Breakdown
Technical Details
| Mag | 4.9 |
| Depth | 198.07 |
| Tsunami | false |
| Sig | 369 |
| Emsc Mag | 4.9 |
| Emsc Depth | -151 |
| Emsc MagType | mb |
| Emsc Region | TONGA |
| Emsc Auth | GFZ |
| Emsc SourceId | 2054035 |
| MergedSources | [{"id":"emsc_20260901_0000139","source":"emsc","severity":"low","severityValue":29.400000000000002,"timestamp":1788258883230,"latitude":-19.617,"longitude":-175.228}] |
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 Nuku‘alofa?
Calamity.live data shows a earthquake event with CalamityScore 8/100, 117 km WNW of Pangai, Tonga (Tonga), based on data from usgs. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.